| This paper focuses on water-saving of aerobic rice drip irrigation under plastic film at the irrigation area of Yellow River in Ningxia, using method of orthogonal test and comparison test, for drip irrigation of rice irrigation quota, the optimal combination of cycle and nitrogen application rate, micro-injection, micro-sprinkler fixed and optimal combinations cycle, effect of different irrigation quota on rice under film drip irrigation test in more systematic research. Main findings are as follows:1.Determined in a rice irrigation fixed cycle and nitrogen application rate by orthogonal test:The factor of importance is the amount of nitrogen fertilizer (main)> irrigation frequency irrigation quota (secondary).The optimal combination of factors is A2B2C3, processing5, the irrigation quota9m3/667m2, irrigation cycle is two days, the amount of nitrogen fertilizer a high level20.7kg/667m2, and the reference treatment for5match, the yield is390.29kg/667m2, total water demand is496.56m3/667m2, total reference crop evapotranspiration of723.86m3/667m2, ten-day average actual water demand is45.14m3/667m2, the ten-day average reference crop evapotranspiration65.81m3/667m2, average crop coefficient is0.67, crop coefficient showing a parabolic trend, water production efficiency of0.846kg/m3,92.2%than conventional irrigation.2.Determined in a rice irrigation fixed cycle and nitrogen application rate by orthogonal test:The factor of importance is the microjet the quota (main)> irrigation cycle> the microjet way (secondary).The optimal combination of factors is A1B2C2, processing2, the irrigation quota9m3/667m2, irrigation cycle is two days, Jet with sprinkler, the yield is372.97kg/667m2, total water demand is496.9m3/667m2, total reference crop evapotranspiration of723.86m3/667m2, the ten-day average water demand is45.17m3/667m2, the ten-day average reference crop evapotranspiration65.81m3/667m2, average crop coefficient is0.67, Crop coefficient showing a parabolic trend, water production efficiency of0.843kg/m.91.6%than conventional irrigation.3.Different irrigation quota on drip irrigation rice test can tell us:processing3, the irrigation quota12m3/667m2, the ten-day average water demand is43.08m3/667m2, the ten-day average reference crop evapotranspiration60.22m3/667m, average crop coefficient is0.72, Crop coefficient showing a parabolic trend, the production efficiency of the irrigation water is0.819kg/m3.86.1%than conventional irrigation.This research results for rice cultivated in aerobic soil micro-irrigation extension provides scientific and technical support, are of great significance for water saving agriculture in Ningxia. |
PDF Full Text Request