The aim of the research is to develop effective growing methods for field crops in irrigative rotations. The following six-field rotations were studied 1) barley with alfalfa for additional sowing – second year alfalfa for green mass – third year alfalfa for green mass – winter wheat – potato – sunflower for grain, and 2) pea for grain – winter wheat (pea stubbly) – barley – corn for silage – soy for grain – maize for grain – sunflower. The studying variants include soil tillage, nutrition backgrounds, and irrigation regimes. The most effective crop rotation was the first one where in 2000-2007 the arable land productivity was 7.67 tons of fodder units per hectare. In the second rotation without alfalfa the index of productivity was 6.00 tons of fodder units per hectare that is less by 26 %. The incorporation of stubble remains provides the total year supply of 19-22 kg/ha of nitrogen, 6.6-7.0 kg/ha of phosphorus, and 18-30 kg/ha of potassium.
Keywords: crop rotations, field crops, growing methods, yield, soil fertility.
