EFFECT OF NITROGEN FERTILIZATION ON YIELD OF SOME NEWLY RELEASED WHEAT VARIETIES UNDER DIFFERENT SEED RATE TREATMENTS

Abstract

Wheat is the most important cereal crop which is used in human food , therefore more investigations were carried out to maximize production through releasing new cultivars , studying the optimum nitrogen levels, the seeding rates and so on . Treatments in the experiments included recent wheat cultivars ( Sakha 69 , Sids 1 and Sids 7 ) , seed rates and nitrogen levels . Agronomic traits of the canopy included measurements at different developmental stages , i. e. plant height , number of different plant organs , dry weight of different plant organs , heading , spike filling , physiological growth parameters , yield and yield components . Significant differences between seeding rates , nitrogen levels treatments in growth , yield and yield attributes were shown but no significant differences were obtained in physiological growth parameters and the interaction between seeding rates and nitrogen levels .