Principles of application

Soybean is the most widespread grain legume. Therefore, in the system of plant nutrition it is necessary to consider the factor, that legume crops are able to fix nitrogen from the atmosphere. Soybean is demanding on soil nutrient availability including nitrogen and potassium. Basal application in autumn and well-fertilized crop predecessor make better use for plant development. While pre-sowing tillage, it is not advisable to shift phosphorous-potassium fertilizers application. To enhance development at the beginning of the growing season it is advisable to apply not more than 20-30 kg/ha of N prior to sowing or at sowing.In case of inoculation is conducted, higher doses of  N lead to reducing of legume bacteria effectiveness. Lodging is also possible. Nitrogen fixation by bacteria from air begins only in 3-4 weeks after start of germination. In case of legume bacteria weak activity, feeding can be applied in the rate of 15-30 kg/ha of nitrogen active ingredient.

Soybean consumes a lot of nitrogen for yield formation including its cash  part. That is why fixation of atmospheric nitrogen partially compensatesnitrogen consumed by plant.  To get 1 t of grainwith the corresponding amount of byproducts it is required 70-90 kg/ha of N, 19-28 kg/ha of phosphorous, 34-40 kg/ha of potassium and 4-5kg/ha of Sulphur.

In the system of crop nutrition Nitrogen fertilizers with Sulphur play significant role in productivity.