[Cultivation upgrading of maize growing for corn at irrigation of light castanozems of the Lower Volga Region]

application rates date de semis deep tillage dose d'application dose d'irrigation dosis de riego dosis de siembra efficiency eficacia engrais organique fecha de siembra graine hybride hybrids irrigation irrigation rates kastanozem kastanozems labor superficial labranza profunda organic fertilizers profondeur de semis profundidad de siembra rendement rendimiento riego russian federation seeds semilla sowing date sowing depth sowing rates surface cultivation travail profond du sol yields zea mays