INFLUENCE OF SOME INTENSIFICATION FACTORS ON THE GRAIN-YIELD OF WINTER-WHEAT

The effect of sprinkler irrigation, plant protection and N fertilization on the grain yield of winter wheat was studied in plot experiments at three sites from 1985 to 1987. On lightly loamed sands, sprinkling resulted in significant yield increments, while there was no significant yield effect on Calcic Chernozem and heavy loam soils. Selective crop protection against foot, leaf and ear diseases boosted yields significantly. Pesticide use should be steered away from prophylactic, broad-spectrum use towards selective use in dependence on the infection pressure. With N fertilization according to actual demands, yields were between 0.1 and 0.15 t/ha higher. Positive interactions between N fertilization, plant protection and sprinkler irrigation were only found on lightly loamed sand at the maximum yield and the highest intensification levels.