Effects Of Different Water-saving Irrigation Methods On Form Of Medium Hybrid Rice Production In Longquan Mountain Irrigation Area

The shortage of water resources has become one of the most critical strategic issues in contemporary China, and the lack of water phenomenon is especially serious in agriculture. Sichuan, its agricultural water consumption is lower than the national and southwest regions, with the ratio of the total amount of water per capita water resources in agriculture also significantly lower than the per capita water resources in the national and the Southwest. Longquan Mountain Irrigation Area is located in the Chengdu Plain edge and Longquan Mountain foothills east. At the peak of rice irrigation, most of the masses irrigated rice by customary, caused a serious waste of irrigation water and a serious shortage of irrigation water on the other side, eventually lead to the waste of water resources, as well as a drop in grain production. In view of this, the test by studying several different irrigation methods (Optimization of Irrigation, Dry and Wet Irrigation, Drought Replenishment Irrigation and Customary Irrigation) formed on medium hybrid rice production and water consumption in the Longquan Mountain Irrigation, to find suitable rice water saving irrigation methods for Longquan Mountain Irrigation, and providing a theoretical basis for guiding the foundation of water-saving irrigation districts in Longquan Mountain and rice yield, and taking a step forward to explore crop water-saving irrigation technology. The main results are as follows.(1) The effecfs of the different irrigation methods on Medium Hybrid Rice tillers in day increments were different. Optimize Irrigation was the highest, and Dry Replenishment Irrigation was minimum, Wet and Dry Irrigation was the same as Customary Irrigation.(2) The orders of different irrigation methods impact on medium hybrid rice height at tillering stage, jointing stage, heading stage and mature stage were:Optimization Irrigation> Wet and Dry Irrigation> Customary Irrigation> Dry Replenishment Irrigation. The orders of leaf area index of medium hybrid rice at tillering stage, jointing stage and heading stage were: Optimize Irrigation> Wet and Dry Irrigation> Customary Irrigation> Dry Replenishment Irrigation. The order of shoot biomass of medium hybrid rice at tillering stage was: Optimization Irrigation> Wet and Dry Irrigation> Dry Replenishment Irrigation> Customary Irrigation; the order of jointing stage was:Dry Replenishment Irrigation> Optimize Irrigation> Customary Irrigation> Wet and Dry Irrigation; the orders of heading and maturity stage were:Optimization Irrigation> Wet and Dry Irrigation> Customary Irrigation> Dry Replenishment Irrigation, while the biggest shoot biomass at maturity stage was15132.0kg/hm2.(3) The order of the impact of different irrigation methods on medium hybrid rice available spikes was:Optimization Irrigation> Wet and Dry Irrigation> Customary Irrigation> Dry Replenishment Irrigation, the most available spikes was250.5×104spike/hm2. The order of the impact of different irrigation methods on medium hybrid rice spike length was:Wet and Dry Irrigation> Optimization Irrigation> Customary Irrigation> Dry Replenishment Irrigation, while the longest spike length was24.2cm.(4) Wet and Dry Irrigation had the most spikelets of per spike in rice, and followed by Optimization Irrigation and Customary Irrigation (both the same). Dry Replenishment Irrigation was the lowest. The order of different irrigation methods on medium hybrid rice single panicle was:Optimize Irrigation> Wet and Dry Irrigation> Customary Irrigation> Dry Replenishment Irrigation. The highest single panicle was3.41g. The order of thousand kernel weight was:Dry Replenishment Irrigation> Wet and Dry Irrigation> Optimize Irrigation> Customary Irrigation, while the most weight of thousand kernel weight was31.46g.(5) The order of the grains affected by different irrigation methods on medium hybrid rice was:Wet and Dry Irrigation> Optimize Irrigation> Customary Irrigation> Dry Replenishment Irrigation; The order of filled grains was:Optimizing Irrigation> Wet and Dry Irrigation> Customary Irrigation> Dry Replenishment Irrigation; The orders of blighted grains and empty grains were:Wet and Dry Irrigation> Dry Replenishment Irrigation> Customary Irrigation> Optimize Irrigation; The order of seed setting rate was:Optimize Irrigation> Customary Irrigation> Dry Replenishment Irrigation> Wet and Dry Irrigation.(6) The orders of different irrigation methods on the theoretical yield and the actual yield of medium hybrid rice were:Optimization Irrigation> Wet and Dry Irrigation> Customary Irrigation> Dry Replenishment Irrigation, while the maximum of theoretical yield was8542.5kg/hm2, and the maximum of actual yield was8752.5kg/hm2.(7) The order of different irrigation methods on water consumption through medium hybrid rice whole growth period was:Customary Irrigation> Optimize Irrigation> Wet and Dry Irrigation> Dry Replenishment Irrigation. The largest water consumption was660.9mm, and the lowest water consumption was387.6mm.In summary, Optimize Irrigation method had a moderate water consumption and water consumption coefficient in several irrigation methods, but it had the highest yield of medium hybrid rice. Therefor, Optimize Irrigation method is the best rice water-saving irrigation method in the Longquan Mountain Irrigation Area.