r a; a a; h a; m k; e a
Abstract
Rice cultivation in Iran is dominantly under submerged condition, which requires plenty of water, nitrogen fertilizer application, very difficult and laborious land preparation, along with high labor costs. In order to assess the effects of different rice cultivation methods on increasing water productivity ...
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Rice cultivation in Iran is dominantly under submerged condition, which requires plenty of water, nitrogen fertilizer application, very difficult and laborious land preparation, along with high labor costs. In order to assess the effects of different rice cultivation methods on increasing water productivity and to find a suitable method of water and nitrogen application, an experiment was carried out in Rice Research Institute of Iran, Amol (RRII), in 2014. The experimental layout was split-split plot with 3 replications, using Keshvari rice variety. Two land preparation methods i.e. with and without puddling, were the main factors, while four levels of irrigation application were the sub-factors, with sub-sub plots allocated to four levels of nitrogen application (N0, N80, N120, N160 kg/ha) . The results showed that the effect of rice cultivation method on water use and water productivity (WP), and the effects of irrigation and nitrogen on yield-related traits, water use and WP were statistically significant at %1 level. The new cultivation technique -aerobic cultivation method- saves water use and increases WP, respectively, as much as 27.95% and 29.11%.With the increasing The application of nitrogen, increased yield and WP, in the form of linear equation. Applying 130% of Class A pan evaporation and nitrogen 120 kg was optimal yield and saving water and nitrogen, respectively 8.9% and 33%.
n s; h p; r a; y m
Abstract
In order to evaluate the possibility and compare different irrigation methods in ricecultivation, an experiment was conducted in factorial based randomized complete blockdesign at Rice Research Institute of Iran, Mazandaran (Amol), during 2011. Treatments weredifferent irrigation regimes including alternate ...
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In order to evaluate the possibility and compare different irrigation methods in ricecultivation, an experiment was conducted in factorial based randomized complete blockdesign at Rice Research Institute of Iran, Mazandaran (Amol), during 2011. Treatments weredifferent irrigation regimes including alternate wet and drying (AWD), semi-dry cultivation(SDC), combining shallow water depth with wetting and drying (SWD) and traditionalirrigation (TI); and two different cultivars, namely, Tarom and Fajr, as local and improvedcultivars, respectively. Results of ANOVA indicated that different cultivars and irrigationmethods were significantly different in terms of irrigation and total water productivity. SDCwith 4042.5 m3ha-1 (nearly 54 percent water saving), irrigation water productivity of WPI=1.68 kg m-3, and total water productivity of WPI+R=1.38 kg m-3 showed better performance ascompared to the other irrigation regimes, especially compared to the traditional management(TI). In conclusion, regarding the better performance in water productivity, advancedirrigation methods (SDC, AWD and SWD, respectively) could be recommended for furtherinvestigations.