Effects of row spacing and plant density on grain yield and yield components of maize (cv. Sc 711)

In order to investigate the effects of row spacing (45، 60 and 75 cm) and plant density (50، 65 and 80 thousand plants per hectare) yield and yield components of maize Sc 711 an experiment was done in the university research farm of Abhar Islamic Azad University in 2006. It was done by using a factorial experiment based on CRBD with four replications. Different developmental stages of maize include 50% emergence، transition from vegetative to reproductive stage، pollination and physiological maturity، plant height and stem diameter in transition stage، dry weight of various organs، yield and yield components and harvest index were studied. With increasing row spacing، stem dry weight in the pollination and physiological maturity، seed weight، grain yield، harvest index and grain number per ear significantly increased. Increasing plant density، leaf dry weight in transition، opening pollination and physiological maturity، stem dry weight in stages pollination and physiological maturity، ear dry weight and grain yield under the effect of density was studied and other traits plant density was not affected. The interaction between row spacing and plant density on stem dry weight in physiological maturity stage، stem diameter in opening pollination stage and grain yield were significant. Finally، knowing that with annual tests can not be a recommendation، but the results may be based on 75 cm row spacing with a density of 8 plants per square meter for the production of maize Sc 711 under conditions similar to this experiment can be recommended.