Effects of Different Fertilization Modes on Dry Matter,Yield, and Contents of Nitrogen,Phosphorus,Potassium in Rice

Slow-release fertilizer and organic manure were used as the test objects,and the conventional fertilizer and no fertilizer were taken as the controls,the effects of different fertilization modes on the yield and major agronomic traits of rice,as well as the contents of nitrogen,phosphorus and potassium in rice plants were studied. The results showed that the rice yield in slow-release fertilizer treatment was 1. 9% ~ 4. 0% higher than that in conventional fertilizer treatment,and the number of grains per panicle and number of filled grains per panicle were also 1. 4% ~ 2. 2% and 1. 9% ~ 3. 5% higher respectively. There was no difference in the growth duration between conventional fertilizer treatment and slow-release fertilizer treatment,but the growth duration of rice in organic fertilizer treatment was 2 ~ 3 d longer than that in conventional fertilizer treatment. The fertilizer efficiencies of slow-release fertilizer and organic fertilizer were exerted backward. At the earlier growth stage of rice,the sorption capacity and absorption ratio in slow-release fertilizer treatment were relatively moderate,but the sorption capacity and absorption ratio in organic manure treatment were significantly lower than those in slow-release fertilizer treatment and conventional fertilizer treatment. At the later growth stage of rice,the sorption capacity and absorption ratio in slow-release fertilizer treatment were higher than those in conventional fertilizer treatment,and the sorption capacity and absorption ratio in organic manure fertilizer treatment were significantly higher than those in slow-release fertilizer treatment. In slow-release fertilizer treatment,the dry matter accumulation of rice was slower at earlier growth stage and faster at later growth stage than that in other treatments,the dry matter accumulation at mature stage was 3. 0% ~ 3. 7% more than that in conventional fertilizer treatment,and the harvest index was also 0. 2% ~ 0. 4% higher.