Effects of different nutrient and water regimes on the morphology and activity of rice root system
不同养分与水分管理对水稻植株根系形态及其活力的影响

The effects of different nutrient and water treatments on the root morphology and activity of rice plant in pot experiment were studied. The results indicate that in alternate wetting and drying model (AWD) and controlled irrigation model (DRA), the root active absorption areas of rice plant by the combined applications of chemical fertilizers with organic manure are 19.3% and 28.2% respectively larger, and the root activities (RA) are 23.7% and 37.9% respectively higher, as compared with the exclusively chemical fertilizers. While in the water regimes of continuous waterlogging (CWL), the effectiveness of chemical fertilizers with organic manure on improvement of the rice root morphology and activity is greatly weakened. The combined applications of chemical fertilizers with organic manure increase the root surface acid phosphatase activity (APA) significantly, especially in the controlled irrigation, the APA of chemical fertilizers with organic manure shows 44.7% higher than that of the chemical fertilizers.