An experiment to find out the wheat growth as affected by foliar application of
potassium Sulphate (K2SO4) on different growth stages under rainfed conditions was
conducted at the Agricultural Research Institute, Dera Ismail Khan, Pakistan. Potassium
doses viz. 0, 12, 18, 24, 30 and 60 kg ha-1 were applied in foliar form at tillering, booting
and heading stages of wheat. The course of study revealed that foliar application of K2O in
booting stage produced maximum leaf area index (LAI), leaf area duration (LAD), crop
growth rate (CGR), net photosynthesis rate (NPR) and grain yield, while its application at
heading stage produced maximum net assimilation rate (NAR). Among different doses, the
application of potassium at the rate of 60 kg ha-1 potassium at the rate of 60 kg ha-1
produced maximum growth and yield and its components during two consecutive cropping
seasons of wheat crop while weed density (m-2), relative weed density (%), fresh weed
biomass (g m-2) and dry weed biomass (g m-2) influenced non-significantly for both the
years. These findings suggest that foliar application of potassium sulphate @ 60 kg ha-1
along with recommended dose of nitrogen (120 kg ha-1) and phosphorus (90 kg ha-1) is the
most suitable for successful wheat production under rainfed conditions.