Investigation Response of Wheat Genotypes to Different level of Nitrogen Fertilizer, Crop Production, Seed Growth Trend and Correlation Between Traits

BACKGROUND: Fertilizer management plays an important role for obtaining satisfactory yields and increase crop productivity. Nutrient management may be achieved by the involvement of organic sources, bio fertilizers, and micro-nutrients. OBJECTIVES: Current study was done to determine the effect of different level of nitrogen and wheat genotypes on agronomic traits, seed growth rate and correlation between characteristics. METHODS: Statistical pattern was split plot experiment according randomized complete block design with three replications. Main factor included four levels of nitrogen fertilizer (N1=60, N2=120, N3=180, N4=240 kg.ha-1, Urea Source) and sub plots consisted four genotypes of Bread (V1: S85-19 as line, V2: Chamran) and Durum (V3: Behrang, V4: Dena) Wheat. RESULT: Result of analysis of variance indicated effect of nitrogen fertilizer (instead number of seed per spikelet and 1000-seed weight), genotypes (instead number of seed per spikelet) and interaction effect of treatments (instead number of spikelet per spike, number of seed per spikelet, 1000-seed weight and harvest index) on all measured traits was significant. Correlation between traits showed the significant correlation between biologic yield (r=0.97**), seed weight (r=0.92**), harvest index (r=0.91**), number of seed per m2 (r= 0.77**), number of seed per spike (r= 0.75**), number of seed per spikelet (r= 0.71**), rate of current photosynthesis (r= 0.69**), rate of redistribution (r= 0.66**), number of spike per m2 (r= 0.62*), number of spikelet per spike (r= 0.59*), contribution of current photosynthesis (r= 0.59*), efficiency of current photosynthesis (r= 0.54*) and seed yield was observed. CONCLUSION: The highest grain filling rate belonged to use 240 and 180 kg.ha-1 nitrogen fertilizer and Chamran genotype at 27 days after anthesis.