اثر خزانه‌گیری زیرپلاستیک و کشت زودهنگام بر عملکرد و اجزای عملکرد ارقام دیررس برنج در منطقه لردگان

To investigate the possibility of late cultivated varieties from north of Iran in early planting by plastic cover in Lordegan, the study conducted in a randomized complete block design with three replications at 2011. In this experiment, six varieties of common late varieties of north of Iran were compared with Koohrang cultivar as control.After disinfection, and conceive seed germination, seedlings were grown separately in specific trays and after emergence were transferred to the nursery after installation it by the wood and plastic cover. Be conducted with care and inspected daily for aeration, transplanting in the main field in the four-to five-leaf stage were done. Care required field experiment was conducted at the appropriate time. Based on the average of two years, Domsiah was produced 6.436 tons per hectare paddy yield and was in a higher class than other varieties. Koohrang as control genotype was produced 5.736 tons of grain per hectare that was lower from Domsiah and higher from other varieties. Experimental results showed that with at least a month early planting, Domsiah and Sahel varieties are recommended. But when the farm cannot be prepared to sowing rice, just Domsiah was recommended.