Optimization of nitrogenous nutrition of grain crops when the content of mobile potassium in polluted 137Cs sod-podzolic sandy soil is different | Оптимизация азотного питания зерновых культур при разной обеспеченности подвижным калием загрязненных 137Сs дерново-подзолистых супесчаных почв
2013
Tsybulko, N.N., Department for Liquidation of Consequences of Chernobyl Accident at the Ministry for Emergency Situations (Belarus) | Kiseleva, D.V., Mogilev State Univ. (Belarus) | Zhukova, I.I., Belarusian State Pedagogical Univ. named after Maxim Tank, Minsk (Belarus)
The researches have established that nitrogen fertilizers on sod-podsolic sandy soils raise the migration of 137Cs in the system 'soil-plant'. With the increase of potassium nutrition level their negative influence decreases. The minimum accumulation of 137Cs is observed when the content of nitrogen in barley grains is 2.0–2.50 %, in winter rye grains – 1.5–1.65, oat grains – 1.50–1.60%. Penetration of 137Cs into plants depends also on the balance of nitrogen and potassium in soil. Its minimum penetration into grain crops is observed when the balance of N:K is within the range 1 : (3.8–4.2). A significant increase of accumulation of 137Cs in grain is observed with the reduction of the proportion of nitrogen to potassium is less than 1 : 3.5. With the increase of mobile potassium content in soils from 150 (the average content) to 210 mg/kg of soil (the raised content) the agroecological optimum of the content of potentially assimilable nitrogen in soils changes from 37.5 to 52.5 mg/kg of soil.
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