Effects of Phosphate Fertilizer Management on Yield Components and Nutrient Uptake and Utilization in Mechanical Transplanting Double-Cropping Rice
In order to investigate the effects of P fertilizer management on the yield and nitrogen,phosphorus and potassium uptake and utilization of double-cropping rice,Xiangzaoxian 45(early rice)and Taiyou 553(late rice)were used as materials to carry out the machine planting test under three phosphorus application levels(45 kg/ha,P45;75 kg/ha P75;105 kg/ha,P105)and two application periods(S1:full base fertilizer;S2:basal fertilizer∶ear fertilizer=2∶1).The results showed that the increase of P application rate could increase the dry matter accumulation of rice and significantly affect the yield and its components,but the application period had no significant effect.There was a certain interaction effect between P application rate and application period,and the yield of early and late rice were significantly higher under P75 treatment,the highest in early rice was P75S1 treatment,and the highest in late rice was P75S2 treatment.With the increase of phosphorus application rate,phosphorus absorption efficiency and utilization rate of phosphorus fertilizer decreased significantly,nitrogen and potassium absorption and absorption efficiency increased significantly in early and late rice,but nitrogen and potassium utilization efficiency decreased significantly,while partial productivity of nitrogen and potassium fertilizer increased first and then decreased,and P75 treatment was the highest.Nitrogen,phosphorus and potassium absorption efficiency of S1 treatment were significantly higher in early rice,while it was opposite in late rice.It can be seen that rational application of P fertilizer can significantly improve rice yield and nutrient absorption and utilization efficiency,and the effect of 75 kg/ha P fertilizer application was the best.Application of phosphorus fertilizer in early season will significantly increase the available phosphorus content in late season soil,so it is better to apply single base fertilizer in early rice,while it is better to apply base fertilizer∶ear fertilizer=2∶1 in late rice.
Double-cropping ricePhosphate fertilizer managementYield componentsNutrient uptake and utilization
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