The effect of hydrothermal conditions on the yield of spring soft wheat (Triticum aestivum L.) when using mineral fertilizers in the arid Volga region

The paper reflects the results of effectiveness use various doses mineral fertilizers in a long stationary experiment on spring soft wheat for nine rotations six-field crop rotation (27 years cultivation) conditions steppe zone Volga region. systematic medium and high nitrogen-phosphorus contributed to obtaining highest yield increases control throughout entire research period. average level correlation between hydrothermal period May-July productivity has been established. Separate calculations by month showed an with June. Based regression analysis, degree influence as factorial feature was determined. analysis that effect obtained values coefficient May July production process vegetating plants insignificant, June it reached 30% according experience.