the Effect of Optimal Irrigation Management On Yield and Yield Components of Second Rice Cultivation (Ratoon) Hashemi Cultivar

Irrigation management plays an important role in the performance and productivity of rice water consumption. This experiment was conducted to investigate the effect of irrigation time on yield and of Ratoon Hashemi cultivar in the form of a factorial design with three replications and in three crop years at the Rice Research Institute (Rasht). Irrigation treatment was at three levels of permanent flooding (I1), capillary cracking (2 mm) (I2) and coarse cracking (5 mm) (I3). The results of compound analysis of variance showed that all quantitative and qualitative traits of Raton rice were significantly affected by the test years. In general, due to the right temperature and hours of sunshine, ratoon growth conditions in the first year of the experiment were better than in the other two years, which positively affected plant height, cluster length and 1000-grain weight, increasing grain yield by 1122 kg / ha. The effect of irrigation management on ratoon yield and yield components also showed that coarse crack irrigation increased yield by 463.4 kg / ha compared to other treatments. Also, the highest plant height of 104.8 cm was obtained from flood irrigation. Irrigation management was not effective on other traits such as 1000-grain weight, straw yield, cluster length and harvest index. The highest water consumption efficiency in the first year was 0.69 kg / m3/ha and the lowest in the third year was 0.41 kg / m3 / ha. Also coarse crack irrigation treatment compared to permanent flood irrigation treatment increased water efficiency by 34%