Influence of Water Fertilizer Coupling on Rice Yield and Compensation under the Condition of Water Control Irrigation

The test is in vegetative growth stage,carrying on control water in varying degrees for the rice,at the same time changing the level of nitrogen,phosphate and potash in the soil,improving water fertilizer coupling,under which do study the changing of the rice yield and find the best mix proportion of water-fertilizer to get rice high yield.By the saturation D-best design to studied the water fertilizer coupling under the condition of water control irrigation.The results showed that nitrogen fertilizer,phosphate fertilizer,potash fertilizer and water have different effect on yield and whose compensation,the sequence of four factors.The influence on yield was that nitrogen was important,the second was water,the third was potassium,and phosphorus was the weakest.When the highest yield reached 16 371.19 kg/hm2,corresponding to nitrogen rate was 206.63 kg/hm2,potassium rate was 50.30 kg/hm2,phosphorus rate was 35.85 kg/hm2,control standards of soil water was 61.37% to 79.78% of saturated soil water content.