اثر مصرف سیلیس و تنش نیتروژن بر جذب عناصر و عملکرد دانه برنج رقم طارم محلی

In order to investigate effect of nitrogen stress and silicon application on nutrition absorb and grain yield of rice var. Tarom Mahalli, an experiment was carried out at split plot in randomized complete block design with three replications at Sari, Mazandaran, Iran in 2012. Main plots was silicon rates including 0, 250, 500 and 1000 kg/ha calcium silicate of and sub plots was nitrogen stress in four growth stages including {start of transplanting (based), start of tillering stage, initial panicle stage and heading stage}. Results showed that the most grain yield 657.3 g/m2 because of increase panicle number per m2 was produced with 750 kg/ha silicon application. With increase silicon application compare to control treatment, nitrogen content of grain and nitrogen harvest index was decreased that showed antagonism relation between these element. With silicon application compare to control silicon content of grain and straw had increased. The maximum grain yield 587.3 g/m2 cause of increase panicle number per m2 was produced in nitrogen stress at based stage. The most nitrogen uptake of grain and straw was produced for nitrogen stress at based stage. Therefore, 750 kg/ha silicon application was the best silicon treatment, and start of tillering and initial heading because of decrease grain yield was the sensitive rice growth stage.