DefinePK

Abstract

A field experiment was carried out to evaluate the effect of different potassium doses and irrigation regimes on growth and yield responses of spring maizeat Faisalabad in spring, 2016. It was comprised of three replications with net plot size 3 × 6 m. The treatments were irrigation regimes (Full irrigation (Control), Skip irrigation at vegetative growth stage, Skip irrigation at vegetative growth stage and grain filling stage) and potassium levels (0, 130, 163, 195 kg ha-1). Murate of Potash (M.O.P) was used as the source of potassium. All other agronomic practices were kept normal and constant for all treatments excluding the factors under study. Data on growth, yield and quality parameters were recorded by following standard procedures. The data was analyzed by using Fisher’s analysis of variance technique and the difference between the treatment means was compared by least significant difference (LSD) test at 5% probability level. The results show that maximum plant height at maturity (209.44 cm), stem diameter (2.11 cm), cob length (20.75 cm), cob diameter (4.09 cm), number of grain rows per cob (15.70), number of grains per cob (471.42), grains weight per cob (140.80 g), 1000-grain weight (275.89 g), economic yield (8.23t ha 1), Stover yield (8.23t ha-1), biological yield (19.34t ha-1), crop growth rate (23.71 g m-2 day-1) and maximum seed oil and protein contents was 4.60% and 8.11%, respectively. It is concluded that potassium should be applied @195 kg ha-1 to get maximum yield of maize under drought stress.