| Heilongjiang province is an important grain base in China. The contradiction between supply and demand of water resources has become i ncreasingly prominent as the increasing of rice-planted area; Low nitrogen utilization efficiency and water pollution are caused by applying nitrogen aimlessly by farmers inorder to get high yield. The above factors seriously restrict rice planting towards the development of high efficiency, high yield and high quality. Study on the effects of different irrigation mode and different N levels on rice yield, water consumption, WUE and quality can provide theoretical support for the demonstration and populariz ation of rice in cold region, and is of great significance to the development of water-saving and high-yield rice.The experiment was carried out in Heilongjiang province rice irrigation experiment center（QingAn Station）.The experiment was used by comprehensive tests while The experiment was set by four irrigation levels（control, intermittent, shallow wet, irrigation） and four nitrogen levels(HL:135 kg·hm-2, CL:105 kg·hm-2,DL: 75 kg·hm-2 and CK:0 kg·hm-2). Rice physiological characteristics, WUE, water consumption, yield and quality data collected by a two-year field experiment were analyzed by method of c omparative analysis, statistical analysis, model optimization, the results are as follows:（1） Rice height increases in a "parabola" shape in a same time interval under different irrigation modes. The increase of the nitrogen fertilizer amount has a significant effect on the plant height within a certain range, and this effect decreases as the increasing of N applied.In general, rice tillering number increases slowly first, then increases rapidly and finially decreases rapidly. Order of tillering number is: high N level > normal N level > low N level > zero N level. Ineffective tiller rate of intermittent irrigation treatments is lowest, controlling irrigation and shallow-wet control irrigation are in the middle, ineffective tiller rate reaches the highest under flooding irrigation mode.（2） Order of WUE under same N level is: controling irrigation > intermittent irrigation > shallow-wet control irrigation > flooding irrigation. rice WUE increases first and then decreases with the increasing of N applied under same water management condition.（3） Only Jensen model is suitable to simulate the water consumption regularity of rice in Qing’an County among several main water production functions. Sensitive index in tasseling stage is the highest, sensitive indexes in jointing stage and tillering stage are in the middle, sensitive index in milky maturity stage is the lowest.（4） Conclusions by comparative analysis of rice quality including Rice milling, nutritional and edible grade are as follows: rice protein content increases first,then decreases and finially increases with the increasing of N, while starch content increases first and then decreases. Irrigation modes have no significant effect on brown and milled rice rates, increasing N amount plays a role in promoting brown and milled rice rates, brown and milled rice rates of zero N level is higher than those of higher N level and normal N level. E dible grade increases first and then decreases with the increasing of N, e dible grade reaches the highest under different N level.According to the experiment result,The optimal high efficiency, high yield and high quality water and nitrogen coupling model was control irrigation with nitrogen amount of 105 kg·hm-2. |
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