اثر زمان نشاکاری بر انتقال مجدد ماده خشک و عملکرد دانه ارقام برنج ( .Oryza Sativa L )

To study the effect of transplanting date on dry matter remobilization and grain yield of rice cultivars, an
experiment was performed as split plot on the base randomized complete block design with three
replicationsin in Rostam Abad-Roudbar- Guilan province in spring, 2013. Three sowing dates (10 May, 28
May and 27 June) at the main plots and three rice genotypes (Khazar, Gohar and Hashemi) as subplots were
considered. The rate, efficiency and of remobilization contribution and current photosynthesis and grain
yield of rice cultivars were measured. Means comparison showed that the highest rates of remobilization
(277 g.m-2), was related to the second planting date and Gohar cultivar. The highest grain yield (7653
and7340 kg.ha-1) were related to first and second trans planting date for Gohar cultivar. The results of current
experiment showed the first and second transplanting date (10 May, 28 May) for improved cultivars caused
the increasing in the remobilization components of dry matter to filling grains and grain yield.