Effect of nitrogen, phosphorus and potassium on the population of insect pests of fodder mustard (Brassica campestrisL.) and its seed yield in india

Abstract

Abstract An experiment was conducted at the Indian Grassland and Fodder Research Institute, Jhansi (U.P.) during the Rabi seasons of 1982–83 and 1983–84 to study the effect of different levels of nitrogen (25, 50 and 75 kg/ha), phosphorus (25, 50 and 75 kg P2O5/ha) and potassium (15, 30 and 45 kg K2O/ha) on the populations of mustard aphid and saw‐fly and the seed production of fodder mustard (Brassica campestris L. var China cabbage). Higher doses of P2O5 and K2O reduced the population of saw‐fly and aphid whereas nitrogen increased these pests. Seed production was increased with higher doses of all three fertilizers.