Maize cultivar response to population density and planting date for grain and biomass yield.

摘要

Three maize genotypes viz; Pahari (short season), Kisan (mid season) and Ehsan (full season) were evaluated at four planting densities (30 000; 60 000; 90 000 and 120 000 plants ha-1) and four planting dates (16 June, 1 July, 16 July and 1 August) at Cereal Crops Research Institute (CCRI) Pirsabak, Nowshera (Pakistan) to determine the optimum planting density and date for grain and biomass yield. Planting on 1 July registered the highest grain yield which was 18 and 19% more than planting on 16 June and 1 August, respectively. Mid-season maize cultivar Kisan gave 17% more grain yield than short season cultivar Pahari and 6% more than full season cultivar Ehsan. The planting density of 90 000 plants ha-1 gave 25% higher grain yield than planting density of 30 000. Early planting on June 16 produced 11% more biomass than late planting on 1 August. Full season cultivar Ehsan yielded 22% more biomass than did short season cultivar Pahari. The highest density of 120 000 plants ha-1 gave 38% more biomass than 30 000 plants ha-1. It is concluded that maize cv. Kisan may be planted on July 01 at density of 90 000 plants ha-1 in Peshawar valley for obtaining maximum grain yield..