Response of groundnut to phosphorus and potassium under different water management practices

Abstract

A field experiment conducted in the sandy loam soil of the Agronomic Research Station, Chalakudy, to study the effect of different irrigation schedules (0.3, 0.6 and 0.9 IW/CPE ratios) and graded doses of phosphorus and potassium 25,50 and 75 kg P205 and K20 per ha respectively) on the growth attributes, yield and yield characters has shown that growth attributes like plant height, number of branches per plant, number of leaves per plant and LAI were favourably influenced by irrigation and application of potassium. Yield characters like number and weight of mature pods per plant, 1 00 pod weight and 1 00 kerne! weight were higher at higher levels of irrigation, phosphorus and potassium. Highest yield was recorded when irrigations were scheduled at 0 9 IW/CPE ratio (irrigating once in 12 days) and 50 kg P205 and 75 kg KaO per ha was found to be sufficient for better yields.