تأثیر شیوه‌ مصرف نیتروژن بر عملکرد دانه و برخی از صفات رشدی ژنوتیپ‌های برنج

This experiment was carried out at split plot in randomized complete blocks design with three replications at Sari, Mazandaran province in 2011. Main plots were rice genotypes that low yield cultivars including Tarom Mahali and Tarom Hashemi and high yield cultivars including Shiroodi and Neda cultivars and sub plots were nitrogen splitting in four levels including (start of transplanting, start of tillering stage, initial panicle stage and complete panicle stage. Results showed number of fertile tiller per hill and number of panicle per m2 were maximum for Shiroodi and Neda cultivars. The most harvest index was observed for Neda cultivar. The most number of panicle per m2, number of total spikelet per panicle, 1000-grain weight and harvest index were obtained in T1 and the least of these traits were produced in T4. Therefore T1 nitrogen splitting had the most efficiency.