Purpose. To establish the optimal seeding time and depth of ‘Dniprovskyi 39’ and ‘Vinets’ sorghum varieties, to prove their effect on the crop photosynthetic capacity in the Right-Bank Forest-Steppe of Ukraine. Methods. Field, laboratory, comparative, analytical, generalizing, mathematical and statistical. Results. It was proved that the best results of crop photosynthetic capacity of sorghum were obtained by sowing in the first decade of May (the second sowing period) at a seeding depth of 4–6 cm. Accordingly, the leaf surface area in these variants reached its maximum during the “panicle-blooming” period and equated 36.13–38.81 thousand m2/ha for the ‘Dniprovskyi 39’ variety and 34.23–36.91 thousand m2/ha for the ‘Vinets’ variety. By sowing seeds in the third decade of April (the first sowing period) at the seedining depth values described above the leaf surface area of the varieties was slightly smaller and amounted to 29.56–31.20 thousand m2/ha for the ‘Dniprovskyi 39’ variety and 27.76–29.40 thousand m2/ha for the ‘Vinets’ variety. By sowing seeds in the second decade of May (the third sowing period), the leaf surface area was 30.68–32.92 thousand m2/ha for the ‘Dniprovskyi 39’ variety and 29.08–31.32 thousand m2/ha for the ‘Vinets’ variety. The highest photosynthetic potential was obtained for sorghum plants in the second sowing period at the seeding depth of 4–6 cm and was 1.27 and 1.34 million m2/ha for the ‘Dniprovskyi 39’ variety and 1.16 and 1.22 million m2/ha for the variety ‘Vinets’. In the first sowing period, this indicator was slightly lower and amounted to 1.18 and 1.23 million m2/ha for the ‘Dniprovskyi 39’ variety and 0.98 and 1.02 million m2/ha for the ‘Vinets’ variety respectively. In the third sowing period, it was the smallest one and equated 1.09 and 1.13 million m2/ha for the ‘Dniprovskyi 39’ variety, and 0.88 and 0.93 million m2/ha for the ‘Vinets’ variety at the optimal seeding depth. The photosynthetic potential was lower at the seeding depth of 2 and 8 cm, which is explained by the different soil and climatic parameters during a certain period of sorghum plant vegetation. The highest value of the photosynthetic capacity net indicator was obtained by sowing seeds at the optimal time and the optimal seeding depth and it equated 3.84–4.02 g/m2 per day for the ‘Dniprovskyi 39’ variety and 3.79 – 3.98 g/m2 per day for the ‘Vinets’ variety. Conclusions. It has been established that the sorghum plants had better vegetation and formed photosynthetic capacity by sowing seeds in the first decade of May at the planting depth of 4–6 cm, which we recommend for growing this crop in the Right-Bank Forest-Steppe of Ukraine.

Цель. Установить оптимальные сроки сева и глубину заделки семян сорго зернового сортов ‘Дніпровський 39’ и ‘Вінець’, обосновать их влияние на фотосинтетическую продуктивность посевов в условиях Правобережной Лесостепи Украины.Методы. Полевой, лабораторный, сравнительный, аналитический, обобщающий, математически-статистический.Результаты. Наилучшие результаты фотосинтетической продуктивности посевов сорго зернового получены во время сева в I декаде мая (второй срок) на глубине заделки семян 4–6 см. Соответственно, площадь листовой поверхности в этих вариантах в период «выбрасывания метелки–цветения» достигала максимума и составляла 36,13–38,81 тыс. м2/га у сорта ‘Дніпровський 39’ и 34,23 – 36,91 тыс. м2/га у сорта ‘Вінець’. При севе семян в III декаде апреля (первый срок) при вышеуказанных значениях глубины заделки площадь листовой поверхнос­ти у сортов была несколько меньше и составляла 29,56–31,20 тыс. м2/га у сорта ‘Дніпровський 39’ и 27,76–29,40 тыс. м2/га у сорта ‘Вінець’. При севе семян во II декаде мая (третий срок) площадь листовой поверхности составляла 30,68–32,92 тыс. м2/га у сорта ‘Дніпровський 39’ и 29,08–31,32 тыс. м2/га у сорта ‘Вінець’. Фотосинтетический потенциал был самым высоким в растениях сорго зернового во втором сроке сева семян на глубине заделки 4–6 см и составлял 1,27 и 1,34 млн м2/га у сорта ‘Дніпровський 39’ и 1,16 и 1,22 млн м2/га у сорта ‘Вінець’. В первом сроке сева этот показатель был несколько ниже и составлял 1,18 и 1,23 млн м2/га у сорта ‘Дніпровський 39’ и 0,98 и 1,02 млн м2/га у сорта ‘Вінець’, соответственно. В третьем сроке сева он был самым низким, у сорта ‘Дніпровський 39’ этот показатель составлял 1,09 и 1,13 млн м2/га, у сорта ‘Вінець’ – 0,88 и 0,93 млн м2/га при оптимальных значениях глубины заделки семян. На глубине заделки семян 2 и 8 см фотосинтетический потенциал был ниже, что объясняют различными почвенно-климатическими условиями в определенный период развития растений сорго. Наивысшее значение показателя чистой продуктивности фотосинтеза было получено при севе семян в оптимальные сроки и оптимальной глубине заделки семян и составляло 3,84–4,02 г/м2 в сутки у сорта ‘Дніпровський 39’ и 3,79–3,98 г/м2 в сутки у сорта ‘Вінець’, соответственно.Выводы. Лучше развивались и формировали фотосинтетическую продуктивность растения сорго зернового при севе семян в первой декаде мая на глубине заделки 4–6 см, которые и рекомендованы для выращивания данной культуры в Правобережной Лесостепи Украины. | Purpose. To establish the optimal seeding time and depth of ‘Dniprovskyi 39’ and ‘Vinets’ sorghum varieties, to prove their effect on the crop photosynthetic capacity in the Right-Bank Forest-Steppe of Ukraine. Methods. Field, laboratory, comparative, analytical, generalizing, mathematical and statistical. Results. It was proved that the best results of crop photosynthetic capacity of sorghum were obtained by sowing in the first decade of May (the second sowing period) at a seeding depth of 4–6 cm. Accordingly, the leaf surface area in these variants reached its maximum during the “panicle-blooming” period and equated 36.13–38.81 thousand m2/ha for the ‘Dniprovskyi 39’ variety and 34.23–36.91 thousand m2/ha for the ‘Vinets’ variety. By sowing seeds in the third decade of April (the first sowing period) at the seedining depth values described above the leaf surface area of the varieties was slightly smaller and amounted to 29.56–31.20 thousand m2/ha for the ‘Dniprovskyi 39’ variety and 27.76–29.40 thousand m2/ha for the ‘Vinets’ variety. By sowing seeds in the second decade of May (the third sowing period), the leaf surface area was 30.68–32.92 thousand m2/ha for the ‘Dniprovskyi 39’ variety and 29.08–31.32 thousand m2/ha for the ‘Vinets’ variety. The highest photosynthetic potential was obtained for sorghum plants in the second sowing period at the seeding depth of 4–6 cm and was 1.27 and 1.34 million m2/ha for the ‘Dniprovskyi 39’ variety and 1.16 and 1.22 million m2/ha for the variety ‘Vinets’. In the first sowing period, this indicator was slightly lower and amounted to 1.18 and 1.23 million m2/ha for the ‘Dniprovskyi 39’ variety and 0.98 and 1.02 million m2/ha for the ‘Vinets’ variety respectively. In the third sowing period, it was the smallest one and equated 1.09 and 1.13 million m2/ha for the ‘Dniprovskyi 39’ variety, and 0.88 and 0.93 million m2/ha for the ‘Vinets’ variety at the optimal seeding depth. The photosynthetic potential was lower at the seeding depth of 2 and 8 cm, which is explained by the different soil and climatic parameters during a certain period of sorghum plant vegetation. The highest value of the photosynthetic capacity net indicator was obtained by sowing seeds at the optimal time and the optimal seeding depth and it equated 3.84–4.02 g/m2 per day for the ‘Dniprovskyi 39’ variety and 3.79 – 3.98 g/m2 per day for the ‘Vinets’ variety.Conclusions. It has been established that the sorghum plants had better vegetation and formed photosynthetic capacity by sowing seeds in the first decade of May at the planting depth of 4–6 cm, which we recommend for growing this crop in the Right-Bank Forest-Steppe of Ukraine. | Мета. Встановити оптимальні строки сівби та глибину загортання насіння сорго зернового сортів ‘Дніпровський 39’ та ‘Вінець’, обґрунтувати їхній вплив на фотосинтетичну продуктивність посівів в умовах Правобережного Лісостепу України. Методи. Польовий, лабораторний, порівняльний, аналітичний, узагальнюючий, математично-статистичний. Результати. Найкращі результати фотосинтетичної продуктивності посівів сорго зернового отримано за сівби у  І декаді травня (другий строк) на глибину загортання насіння 4–6 см. Відповідно, площа листкової поверхні за цих факторів у період «викидання волоті – цвітіння» сягала максимуму і дорівнювала 36,13–38,81 тис. м2/га у сорту ‘Дніпровський 39’ та 34,23–36,91 тис. м2/га у сорту ‘Вінець’. За сівби насіння у ІІІ декаді квітня (перший строк) за таких самих значень глибини загортання площа листкової поверхні у сортів була дещо меншою і становила 29,56–31,20 тис. м2/га у сорту ‘Дніпровський 39’ та 27,76–29,40 тис. м2/га у сорту ‘Вінець’. За сівби насіння у ІІ декаді травня (третій строк) площа листкової поверхні дорівнювала 30,68–32,92 тис. м2/га у сорту ‘Дніпровський 39’ та 29,08–31,32 тис. м2/га у сорту ‘Вінець’. Фотосинтетичний потенціал був найвищим у рослин сорго зернового за ІІ строку сівби насіння та глибини загортання 4–6 см й дорівнював 1,27 та 1,34 млн м2/га у сорту ‘Дніпровський 39’ і 1,16 та 1,22 млн м2/га у сорту ‘Вінець’. За І строку сівби цей показник був дещо меншим і відповідно становив 1,18 та 1,23 млн м2/га у сорту ‘Дніпровський 39’ й 0,98 і 1,02 млн м2/га у сорту ‘Вінець’. За ІІІ строку сівби він був найменшим та у сорту ‘Дніпровський 39’ дорівнював 1,09 і 1,13 млн м2/га, у сорту ‘Вінець’ 0,88 і 0,93 млн м2/га за оптимальних значень глибини загортання насіння. За глибини загортання насіння 2 та 8 см фотосинтетичний потенціал був нижчим, що пояснюють різними ґрунтово-кліматичними умовами у певний період розвитку рослин сорго. Найбільше значення показника чистої продуктивності фотосинтезу було отримано за сівби насіння в оптимальні строки та за оптимальної глибини загортання насіння і становило у сорту ‘Дніпровський 39’, відповідно, 3,84–4,02 г/м2 за добу, у сорту ‘Вінець’ 3,79–3,98 г/м2 за добу.Висновки. Найкраще розвивались та формували фотосинтетичну продуктивність рослини сорго зернового за сівби насіння у першій декаді травня на глибину загортання 4–6 см, які й рекомендовано для вирощування даної культури в Правобережному Лісостепу України.

Purpose. To establish the optimal seeding time and depth of ‘Dniprovskyi 39’ and ‘Vinets’ sorghum varieties, to prove their effect on the crop photosynthetic capacity in the Right-Bank Forest-Steppe of Ukraine. Methods. Field, laboratory, comparative, analytical, generalizing, mathematical and statistical. Results. It was proved that the best results of crop photosynthetic capacity of sorghum were obtained by sowing in the first decade of May (the second sowing period) at a seeding depth of 4–6 cm. Accordingly, the leaf surface area in these variants reached its maximum during the “panicle-blooming” period and equated 36.13–38.81 thousand m2/ha for the ‘Dniprovskyi 39’ variety and 34.23–36.91 thousand m2/ha for the ‘Vinets’ variety. By sowing seeds in the third decade of April (the first sowing period) at the seedining depth values described above the leaf surface area of the varieties was slightly smaller and amounted to 29.56–31.20 thousand m2/ha for the ‘Dniprovskyi 39’ variety and 27.76–29.40 thousand m2/ha for the ‘Vinets’ variety. By sowing seeds in the second decade of May (the third sowing period), the leaf surface area was 30.68–32.92 thousand m2/ha for the ‘Dniprovskyi 39’ variety and 29.08–31.32 thousand m2/ha for the ‘Vinets’ variety. The highest photosynthetic potential was obtained for sorghum plants in the second sowing period at the seeding depth of 4–6 cm and was 1.27 and 1.34 million m2/ha for the ‘Dniprovskyi 39’ variety and 1.16 and 1.22 million m2/ha for the variety ‘Vinets’. In the first sowing period, this indicator was slightly lower and amounted to 1.18 and 1.23 million m2/ha for the ‘Dniprovskyi 39’ variety and 0.98 and 1.02 million m2/ha for the ‘Vinets’ variety respectively. In the third sowing period, it was the smallest one and equated 1.09 and 1.13 million m2/ha for the ‘Dniprovskyi 39’ variety, and 0.88 and 0.93 million m2/ha for the ‘Vinets’ variety at the optimal seeding depth. The photosynthetic potential was lower at the seeding depth of 2 and 8 cm, which is explained by the different soil and climatic parameters during a certain period of sorghum plant vegetation. The highest value of the photosynthetic capacity net indicator was obtained by sowing seeds at the optimal time and the optimal seeding depth and it equated 3.84–4.02 g/m2 per day for the ‘Dniprovskyi 39’ variety and 3.79 – 3.98 g/m2 per day for the ‘Vinets’ variety. Conclusions. It has been established that the sorghum plants had better vegetation and formed photosynthetic capacity by sowing seeds in the first decade of May at the planting depth of 4–6 cm, which we recommend for growing this crop in the Right-Bank Forest-Steppe of Ukraine.

Purpose. To study the influence of fractional composition of seed material on productive properties of spring rape seeds of the ‘Magnat’ variety and ‘MVM’ (‘Gladiator’) variety sample. Methods. Field investigations, laboratory tests, statistical analysis. Results. During 2013–2014, the influence of sown seeds of different size fractions (up to 2,5 g; 2,6–3,5 g; 3,6 g and more) on the indices of productivity of spring rape varie­ties was studied. It was found that over the years of study field germination of sown fractions of seeds in ‘Magnat’ variety averaged 83.5%, in ‘MSM’ variety sample – 86.7%. During the periods of seedling emergence and harvesting, the density of spring rape crops varied depending on relevant fraction of sown seeds. In the ‘Magnat’ variety, photosynthetic potential of crops ranged from 1.1 to 1.3 million m2/ha, in ‘MSM’ variety sample – from 1.2 to 1.6 million m2/ha. Depending on the seed fractions applied, ‘Magnat’ variety crops during the gro­wing season accumulated organic biomass from 2.05 to 2.36 g/m2 per day, ‘MSM’ sample variety – from 1.83 to 2.10 g/m2 per day. Conclusions. It was established that different fractions of spring rape seeds sown in the Northern Forest-Steppe zone of Ukraine affected the indices of germinating energy and laboratory germination, crop density formation, leaf surface area and intensity of photosynthesis process (crop photosynthetic potential, net photosynthesis performance). The highest indices of productivity and yield in the ‘Magnat’ variety was ensured by large-seeded fraction (3,6 g and more), in the ‘MVM’ (‘Gladia­tor’) sample variety – by small-seeded fraction (up to 2,5 g).

Purpose. To study the influence of fractional composition of seed material on productive properties of spring rape seeds of the ‘Magnat’ variety and ‘MVM’ (‘Gladiator’) variety sample. Methods. Field investigations, laboratory tests, statistical analysis. Results. During 2013–2014, the influence of sown seeds of different size fractions (up to 2,5 g; 2,6–3,5 g; 3,6 g and more) on the indices of productivity of spring rape varie­ties was studied. It was found that over the years of study field germination of sown fractions of seeds in ‘Magnat’ variety averaged 83.5%, in ‘MSM’ variety sample – 86.7%. During the periods of seedling emergence and harvesting, the density of spring rape crops varied depending on relevant fraction of sown seeds. In the ‘Magnat’ variety, photosynthetic potential of crops ranged from 1.1 to 1.3 million m2/ha, in ‘MSM’ variety sample – from 1.2 to 1.6 million m2/ha. Depending on the seed fractions applied, ‘Magnat’ variety crops during the gro­wing season accumulated organic biomass from 2.05 to 2.36 g/m2 per day, ‘MSM’ sample variety – from 1.83 to 2.10 g/m2 per day. Conclusions. It was established that different fractions of spring rape seeds sown in the Northern Forest-Steppe zone of Ukraine affected the indices of germinating energy and laboratory germination, crop density formation, leaf surface area and intensity of photosynthesis process (crop photosynthetic potential, net photosynthesis performance). The highest indices of productivity and yield in the ‘Magnat’ variety was ensured by large-seeded fraction (3,6 g and more), in the ‘MVM’ (‘Gladia­tor’) sample variety – by small-seeded fraction (up to 2,5 g).

Purpose. Jute mallow (Corchorus olitorius L.) is a mucilaginous vegetable and fiber crop cultivated in the tropics, where catnip (Nepeta cataria L.) and Mexican sunflower (Tithonia diversifolia L.) are common weeds. Hence, the study investigated the growth, yield, and nutrient level of jute mallow in weed-free, catnip, and Mexican sunflower environments. Methods. The study involved two screen-house experiments in a Completely Randomized Design (CRD) with six replications. The treatments were 0 (control), 2, 4, 6, 8, and 10 weed plants per pot in both experiments. These are 0, 100, 200, 300, 400, and 500 weed count per square meter equivalent, based on the surface area of the pots used. Mexican sunflower and catnip plants interacted with jute plants in the first and second experiments, respectively. Growth parameters of jute mallow were recorded weekly from 5 to 8 weeks after sowing (WAS), and harvesting was done at 8 WAS. The proximate composition of jute was evaluated using standard procedures outlined by AOAC. The data collected were subjected to analysis of variance (ANOVA), and means were separated using Duncan Multiple Range Test (DMRT) at P < 0.05. Results. Catnip and Mexican sunflower negatively impacted the morphological features of jute mallow from 100 plants per square meter upwards. Catnip and Mexican sunflower, at 300 and 100–500 plants per square meter, respectively, reduced the dry weight of jute mallow. The crude protein content of jute mallow was also lessened by Mexican sunflower at some point. Conclusions. The study recommends that the density of catnip and Mexican sunflower plants interacting with jute mallow should be maintained below 100 plants per square meter to prevent yield loss.

Purpose. Jute mallow (Corchorus olitorius L.) is a mucilaginous vegetable and fiber crop cultivated in the tropics, where catnip (Nepeta cataria L.) and Mexican sunflower (Tithonia diversifolia L.) are common weeds. Hence, the study investigated the growth, yield, and nutrient level of jute mallow in weed-free, catnip, and Mexican sunflower environments.Methods. The study involved two screen-house experiments in a Completely Randomized Design (CRD) with six replications. The treatments were 0 (control), 2, 4, 6, 8, and 10 weed plants per pot in both experiments. These are 0, 100, 200, 300, 400, and 500 weed count per square meter equivalent, based on the surface area of the pots used. Mexican sunflower and catnip plants interacted with jute plants in the first and second experiments, respectively. Growth parameters of jute mallow were recorded weekly from 5 to 8 weeks after sowing (WAS), and harvesting was done at 8 WAS. The proximate composition of jute was evaluated using standard procedures outlined by AOAC. The data collected were subjected to analysis of variance (ANOVA), and means were separated using Duncan Multiple Range Test (DMRT) at P < 0.05.Results. Catnip and Mexican sunflower negatively impacted the morphological features of jute mallow from 100 plants per square meter upwards. Catnip and Mexican sunflower, at 300 and 100?500 plants per square meter, respectively, reduced the dry weight of jute mallow. The crude protein content of jute mallow was also lessened by Mexican sunflower at some point.Conclusions. The study recommends that the density of catnip and Mexican sunflower plants interacting with jute mallow should be maintained below 100 plants per square meter to prevent yield loss. | ????. ???? ???????????? (Corchorus olitorius L) ? ?? ??????? ? ??????? ????????, ??? ????????? ? ????????. ?????????? ?????????, ?? ?????????? ???? ??????, ? ?????? ????? ???????? (Nepeta cataria L.) ? ????????????? ???????? (Tithonia diversifolia?L). ? ?????? ??????????? ??????? ????, ??????????? ? ????? ?????? ??????????? ? ???????? ????? ????????????? ?? ????? ??????????? ??????? ????? ?????????? ? ?????????????? ????????? ?? ? ??????????, ???????? ??? ????????.??????. ??????????? ???????? ??? ???????????? ???????????? ?? ???????? ?????????????? ?????? ? ????? ???????????. ????? ??????? ? ????????????? ???? ?????: 0 (????????), 2, 4, 6, 8 ? 10 ???????? ?? ??????? ??? ???????????. ? ??????????? ????? ???????? ???????????? ????????, ???? ????????? ??????????? 0, 100, 200, 300, 400 ? 500 ???????? ?? 1??2. ????????? ????? ????? ????????????? ??????????? ??????? ? 5 ?? 8 ????? ????? ?????, ? ?????? ??????? ????? 8 ??????. ????? ?????? ?????? ? ???????? ????? ????????? ? ????????????? ??????????? ????????, ?????????? ?????????? ????????? ????????????????????? ???????. ???????? ?????????? ???? ????????? ?? ????????????? ??????? ????????????? ??????? (ANOVA).??????????. ?????? ????? ???????? ? ?????????????? ???????? ?? ????????? ??? 100 ?????? ?? ???????????? ???? ??????? ????????? ???????? ?? ???????????? ???????????????? ????? ?????????????. ?? ???????, ?? ??????????? 100?500 ?????? ?? ?????????? ????, ??????????? ????? ????????? ????? ???? ????? ?????????????. ?? ????????????, ????????????? ???????? ???? ????? ??????????? ????????? ?????? ?????? ???????? ? ????? ?????????????.????????. ??? ??????????? ????? ?????? ?????????????? ???????????? ??????????? ?????? ??????? ????? ??????????? ?? ?????????????? ????????? ? ??????? ????? ??????????????? ?????? ??? 100 ??./?2.

Purpose. Jute mallow (Corchorus olitorius L.) is a mucilaginous vegetable and fiber crop cultivated in the tropics, where catnip (Nepeta cataria L.) and Mexican sunflower (Tithonia diversifolia L.) are common weeds. Hence, the study investigated the growth, yield, and nutrient level of jute mallow in weed-free, catnip, and Mexican sunflower environments. Methods. The study involved two screen-house experiments in a Completely Randomized Design (CRD) with six replications. The treatments were 0 (control), 2, 4, 6, 8, and 10 weed plants per pot in both experiments. These are 0, 100, 200, 300, 400, and 500 weed count per square meter equivalent, based on the surface area of the pots used. Mexican sunflower and catnip plants interacted with jute plants in the first and second experiments, respectively. Growth parameters of jute mallow were recorded weekly from 5 to 8 weeks after sowing (WAS), and harvesting was done at 8 WAS. The proximate composition of jute was evaluated using standard procedures outlined by AOAC. The data collected were subjected to analysis of variance (ANOVA), and means were separated using Duncan Multiple Range Test (DMRT) at P < 0.05. Results. Catnip and Mexican sunflower negatively impacted the morphological features of jute mallow from 100 plants per square meter upwards. Catnip and Mexican sunflower, at 300 and 100–500 plants per square meter, respectively, reduced the dry weight of jute mallow. The crude protein content of jute mallow was also lessened by Mexican sunflower at some point. Conclusions. The study recommends that the density of catnip and Mexican sunflower plants interacting with jute mallow should be maintained below 100 plants per square meter to prevent yield loss.

Purpose. To determine the features of the leaf surface area formation and the dynamics of growth of the vege­tative mass of various sainfoin species depending on the influence of mineral fertilizers and inoculation. Methods. Field, laboratory, statistical. Results. In the course of experimental studies, the morphological features of plants in the process of growth and development of various sainfoin species were studied. As our studies showed, all sainfoin species had different plant densities, which accordingly affected the leaf surface area. In the budding phase, the leaf surface area of plants of the first year in continuous cultivation ranged from 17.01 to 24.3 thousand m2/ha on average over three years; in particular, from 18.06 to 24.3 – for common sainfoin; 17.6–20.5 – for transcaucasus sainfoin and 17.1–20.3 thousand m2/ha – for sand sainfoin. The maximum leaf surface area of the plants of the first year of cultivation, regardless of its species, was observed during flowering with the application of complete mineral fertilizer (N45P60K90). In areas without fertilizer this figure was much lower. In the experiments, an increase in the leaf surface on all three studied species and sainfoin varieties from the first to the third year of their cultivation was clearly observed. According to the results of gross productivity for 2 mowings, it was found that common sainfoin forms the maximum increase of top with complete mineral fertilizer and seed inoculation – 43.03 t/ha. Conclusions. The productivity of sainfoin crops depended mostly on the application of complete fertilizer at a dose of N45P60K90 + inoculation of seeds. To a much lesser extent, the species of sainfoin and the cutting height of the first mowing of the grass stand affected its productivity. It was revealed that the greatest dynamics of vegetative mass growth was observed in common sainfoin, and the smallest was recorded in sand sainfoin.

Purpose. To determine the features of the leaf surface area formation and the dynamics of growth of the vege­tative mass of various sainfoin species depending on the influence of mineral fertilizers and inoculation. Methods. Field, laboratory, statistical. Results. In the course of experimental studies, the morphological features of plants in the process of growth and development of various sainfoin species were studied. As our studies showed, all sainfoin species had different plant densities, which accordingly affected the leaf surface area. In the budding phase, the leaf surface area of plants of the first year in continuous cultivation ranged from 17.01 to 24.3 thousand m2/ha on average over three years; in particular, from 18.06 to 24.3 – for common sainfoin; 17.6–20.5 – for transcaucasus sainfoin and 17.1–20.3 thousand m2/ha – for sand sainfoin. The maximum leaf surface area of the plants of the first year of cultivation, regardless of its species, was observed during flowering with the application of complete mineral fertilizer (N45P60K90). In areas without fertilizer this figure was much lower. In the experiments, an increase in the leaf surface on all three studied species and sainfoin varieties from the first to the third year of their cultivation was clearly observed. According to the results of gross productivity for 2 mowings, it was found that common sainfoin forms the maximum increase of top with complete mineral fertilizer and seed inoculation – 43.03 t/ha. Conclusions. The productivity of sainfoin crops depended mostly on the application of complete fertilizer at a dose of N45P60K90 + inoculation of seeds. To a much lesser extent, the species of sainfoin and the cutting height of the first mowing of the grass stand affected its productivity. It was revealed that the greatest dynamics of vegetative mass growth was observed in common sainfoin, and the smallest was recorded in sand sainfoin. | Цель. Определить особенности формирования площади листовой поверхности и динамику нарастания вегетативной массы различных видов эспарцета в зависимости от влияния минеральных удобрений и инокуляции. Методы. Полевой, лабораторный, статистический. Результаты. В процессе экспериментальных исследований изучены морфологические особенности растений в процессе роста и развития различных видов эспарцета. Как показали исследования, все виды эспарцета имели различную плотность стояния растений, которая соответствующим образом влияла на площадь листовой поверхности. В фазе бутонизации площадь листовой поверхности растений эспарцета первого года выращивания в сплошном посеве в среднем за три года колебалась от 17,01 до 24,3 тыс. м2/га, в частности, у посевного – от 18,06 до 24,3; закавказского – 17,6–20,5 и песчаного – 17,1–20,3 тыс. м2/га. Максимальную площадь листовой поверхности у растений эспарцета первого года выращивания, независимо от его вида, наблюдали в период цветения при внесении полного минерального удобрения (N45Р60К90). На участках без удобрения этот показатель был значительно меньше. В опытах четко наб­людалось увеличение листовой поверхности на всех трех исследуемых видах и сортах эспарцета от первого к третьему году ихнего выращивания. Согласно полученным результатам по валовой урожайности за 2 укоса установлено, что максимальное нарастание надземной массы формирует эспарцет посевной при полном минеральном удобрении и инокуляции семян – 43,03 т/га. Выводы. Продуктивность в посевах эспарцета больше зависела от внесения полного минерального удобрения в дозе N45Р60К90 + инокуляция семян. Значительно в меньшей степени влияли вид эспарцета и высота скашивания травостоя первого укоса. В результате исследований установлено, что наибольшая динамика нарастания вегетативной массы наблюдалась у эспарцета посевного, а наименьшую было зафиксировано у эспарцета песчаного. | Мета. Визначити особливості формування площі листкової поверхні та динаміку наростання вегетативної маси різних видів еспарцету залежно від впливу мінеральних добрив та інокуляції. Методи. Польовий, лабораторний, статистичний. Результати. Під час експериментальних досліджень вивчено морфологічні особливості рослин у процесі росту й розвитку різних видів еспарцету. Як показали дослідження, всі види еспарцету мали різну щільність стояння рослин, яка відповідним чином впливала на площу листкової поверхні. У фазу бутонізації площа листкової поверхні рослин еспарцету першого року вирощування у суцільному посіві в середньому за три роки коливалась від 17,01 до 24,3 тис. м2/га, зокрема, у посівного – від 18,06 до 24,3; закавказького – 17,6–20,5 і піщаного – 17,1–20,3 тис. м2/га. Максимальну площу листкової поверхні у еспарцету першого року вирощування, незалежно від його виду, спостерігали в період цвітіння за внесення повного мінерального добрива (N45Р60К90). На неудобрених ділянках цей показник був значно менший. У дослідах чітко спостерігалось збільшення листкової поверхні на всіх трьох досліджуваних видах та сортах еспарцету від першого до третього року їхнього вирощування. Згідно з отриманими результатами валової врожайності за 2 укоси встановлено, що максимальне наростання надземної маси формує еспарцет посівний за пов­ного мінерального удобрення та інокуляції насіння – 43,03 т/га. Висновки. Продуктивність еспарцетових посівів найбільше залежала від внесення повного мінерального добрива в дозі N45Р60К90 + інокуляція насіння. Значно меншою мірою впливали вид еспарцету та висота скошування травостою першого укосу. У результаті досліджень встановлено, що найбільша динаміка наростання вегетативної маси спостерігалась в еспарцету посівного, а найменшу було зафіксовано в еспарцету піщаного.

Purpose. To determine the features of the leaf surface area formation and the dynamics of growth of the vege­tative mass of various sainfoin species depending on the influence of mineral fertilizers and inoculation. Methods. Field, laboratory, statistical. Results. In the course of experimental studies, the morphological features of plants in the process of growth and development of various sainfoin species were studied. As our studies showed, all sainfoin species had different plant densities, which accordingly affected the leaf surface area. In the budding phase, the leaf surface area of plants of the first year in continuous cultivation ranged from 17.01 to 24.3 thousand m2/ha on average over three years; in particular, from 18.06 to 24.3 – for common sainfoin; 17.6–20.5 – for transcaucasus sainfoin and 17.1–20.3 thousand m2/ha – for sand sainfoin. The maximum leaf surface area of the plants of the first year of cultivation, regardless of its species, was observed during flowering with the application of complete mineral fertilizer (N45P60K90). In areas without fertilizer this figure was much lower. In the experiments, an increase in the leaf surface on all three studied species and sainfoin varieties from the first to the third year of their cultivation was clearly observed. According to the results of gross productivity for 2 mowings, it was found that common sainfoin forms the maximum increase of top with complete mineral fertilizer and seed inoculation – 43.03 t/ha. Conclusions. The productivity of sainfoin crops depended mostly on the application of complete fertilizer at a dose of N45P60K90 + inoculation of seeds. To a much lesser extent, the species of sainfoin and the cutting height of the first mowing of the grass stand affected its productivity. It was revealed that the greatest dynamics of vegetative mass growth was observed in common sainfoin, and the smallest was recorded in sand sainfoin.