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Implications of residual Atrazine for wheat
2006 | 2000
Reinhardt, Carl Frederick (Charlie) | Tshipala, Khathutshelo Edward
Dissertation (M Inst Agrar (Weed Science))--University of Pretoria, 2006. | Please read the abstract in the section 00front of this document | Microbiology and Plant Pathology | unrestricted
Показать больше [+] Меньше [-]Ifluence of Rice-wheat and Maize-wheat Cropping Sequences on the Development of karnal Bunt of Wheat
2000
Sharma, S.K. | Bagga, P.S. | Kumar, V. (Punjan Agricultural University Gurdaspur (India). Regional Research Station).
Economic study on effects of mung bean planting on quantitative and qualitative yield of wheat rotation and wheat-mung bean-wheat ratation
2000
Shir Esmaeili, Gholam Hossein | Soleymani Pur, Ahmad | Ghandi,Akbar | Nikuei, A`li Reza
[The influence of cold damage on wheat]
2000
Van Niekerk, F. (Agricultural Research Council, Bethlehem (South Africa))
Economics of fertilizer use on durum wheat
2000
Teklewold, A. H. | Ayele, G. (Debre Zeit Agricultural Research Center, Debre Zeit (Ethiopia))
Fanners in wheat growing areas of Ethiopia rely on wheat production for various purposes. Even though the role played by fertilizer use is increasing, economic use of fertilizer is not well addressed due to a wide range of factors. Economic use of fertilizer consists of among other things, choosing the right kind and quantity of fertilizer including both input and output prices. The relation between fertilizer and wheat price determines the level of profitability in the use of fertilizer and thereby effective demand for fertilizer by farmers. The multiple regression analysis is used to derive the mathematical wheat yield function for different application of nitrogen and phosphorous fertilizers. In the two nutrient case, profit maximization requires the value of marginal physical productivity of each nutrient be equal to its respective marginal nutrient cost times the investment cost. The economic optimum point is a dynamic concept, which is influenced by variation in relative price of input-output. This issue can be analyzed using sensitivity analysis. At the prevailing grain and nutrient prices, the study revealed that, using optimum rate of nutrients would give a 65% marginal rate of return over the traditional farmers' rate. As the ultimate success of fertilization of wheat depends on the prices of wheat and fertilizers, developing a fertilizer pricing policy that is based on cost-benefit analysis should be a prerequisite. Thus both policy makers and farmers should pay attention to the type and economic optimum use for fertilizer efficiency in durum wheat production.
Показать больше [+] Меньше [-]The effect of wheat-rye translocation 1BL.1RS on some biological traits in wheat
2000
Dimitrijevic, M. | Petrovic, S. (Faculty of Agriculture, Novi Sad (Yugoslavia))
The sample of 139 varieties of common wheat (Triticum aestivum L.) predominantly Serbian winter wheat varieties originated in the Institute of Field and Vegetable Crops in Novi Sad (Yugoslavia), has been examined for presence of 1Bl.1Rs wheat-rye translocation. The presence of translocation has been established in 40% of genotypes in study. Two genotype groups consisted of varieties possessing and lacking the translocation have been compared for biological properties behavior. Namely, stem rust, leaf rust, powdery mildew as well as, winter hardiness have been under the study. The influence of 1Bl.1Rs translocation has been studied per se, as well as, in a light of wheat grain storage protein (glutenin and gliadin) genetic background composition. Genetic composition for alleles in question has been screened using SDS-PAGE, and A-PAGE electrophoresis. The presence of the translocation has been rechecked using C-banding technique. Genotypes having the translocation appeared to be more tolerant to stem rust, and leaf rust (as a trend), but more susceptible to powdery mildew. These effects have been slightly modified depending on examined genetic background, but the efffect of 1Rs chromosomal translocated segment has been the main cause for the observed differences.
Показать больше [+] Меньше [-]Distibution and damaging characteristics of wheat blossom midge, Sitodiplosismosellana (Gehin) (Diptera:Cecidomyiidae) on wheat heads
2000
Wu Junxiang | Yuan Feng | Su Li(Northwest Science and Technology University of Agriculture and Forestry, Yangling (China), Department of Plant Protection)
Natural occurence of Fusarium graminearum on adult wheat midge and transmission to wheat spikes
2000
Mongrain, D. | Couture, L. | Comeau, A.
To determine the presence of Fusarium graminearum on wheat midges (Sitodiplosis mosellana), adult females were captured from a spring wheat (Triticum aestivum) field near Quebec City (Canada) and plated on potato dextrose agar. A month aspirator was used to capture live midges in sterile vials. F. graminearum was isolated from 2.1., 5.3 and 0.6% of midges captured in 1997, 1998 and 1999, respectively whereas other Fusarium spp. were isolated from 2.5% of the midges in 1999 and from none in 1997 and 1998.
Показать больше [+] Меньше [-]Effect of wheat straw incorporation on yield of green gram and wheat, soil fertility and microbiota
2000
Surya, J.N. | Puranik, R.B. | Zadode, S.D. | Deshmukh, S.D. (Dr. Punjabrao Deshmukh Krishi Vidhyapeeth, Akola (India)).
A field experiment was conducted on Entisols with green gram-wheat sequence, using biogas slurry treated wheat straw in kharif and various fertilizer level with a view to study their effects on corp yields, soil fertility and microbiota. Yield of green gram increased with fertiliser levels. Incorporation of wheat straq @ 3 and 6 mt ha-1 significantly increased grain yield of green gram (10-19%) over control. NPK uptake by green gram increased due to fertilizer levels and incorporation of wheat straw. Application of 80:40:40 kg N, P2O5 and K2O to wheat corp gave highest grain yield (31.06 q ha-1). However, wheat straw incroporation showed better residual effect in tenns of yield ol wheat and nutrient uptake. Increasing levels of fertiliser applied to wheat crop enhanced N.P. and K uptake by 1.7-2.7, 1.9-3.1 and 1.8-3 folds, respectively over control. Organic C status was markedly improved due to incorporation of wheat straw @ 6 mt ha-1, Build up in available NPK content was observed in treatments receiving fertiliser and wheat straw after harvest of wheat crop. Microbial population increased tremendously by incorporation of wheat straw at 30 DAS of green gram. Thus, corp residue can be gainfully utilized by incorporation into soil resulting in improvement of soil fertility, microbiota and crop yields.
Показать больше [+] Меньше [-]Effect of electromagnetic waves on initial growth of wheat
2000
Marinkovic, B.J. (Univerzitet u Novom Sadu, Novi Sad (Yugoslavia). Poljoprivredni fakultet, Institut za ratarstvo i povrtarstvo) | Petrovic, N.M. | Malesevic, M.M. | Marinkovic, J.B. | Malic, B.C.
Three wheat varieties have been tested for the effect of low-frequency electromagnetic waves on their initial growth. Each variety was exposed to the waves of different frequencies. After treatment, seeds were germinated and plants were grown in water solution. The obtained results indicate that each frequency has a specific effect on root mass and aboveground part mass. When the variety Kremna was treated for improved root development, differences in mass were significant, 6.75 g per plant in fresh mass and 0.07 g per plant in dry mass, or 31.0 and 22.6%, respectively. Similar results were obtained for the variety Tera, 14.3 and 17.8%, respectively. When the varieties were treated for improved development of the aboveground part, there were no significant differences in root mass. Root masses of the treated variety Nevesinjka, were significantly higher than those in the control, by 28.6, respectively. Difference in the mass of the aboveground part was 14.3, respectively. In the varieties Kremna and Tera, at frequencies for improved development of the aboveground part, the differences were 7.3 and 22.1%, respectively.
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