Effects of phosphate application on phosphorus content and yield of Adsuki bean

The experiment was conducted to study the effect of phosphate application on phosphorus absorption and yield of Adsuki bean in fluvo-aquic soil area. The results showed that effect of phosphate on yield was very significant and the maximum yield was obtained when the amount of phosphate application was 68.8kg/hm². Correlation between phosphorus content and yield reached a very significant level, its correlation coefficients were0.9375 and 0.7863 respectively during pod-setting and pod-filling stage and ripening stage. During the whole growing period, there was one phosphorus content peak in which about 10 days after flowering reached the maximum. The appropriate phosphorus contents before flower-beginning,flower-beginning to 20 days after blooming, 20 days after blooming later were 4.0mg/g, 4.4～4.8mg/g, 3.9～3.5mg/g respectively.Relation between the yield and the amount of phosphorus absorption was quadratic equation with 0.9823 determination coefficient.Correlation between the amount of phosphate application and amount of phosphorus absorbed reached a significant level and its correlation coefficient was 0.9644.