Dynamic changes of yield and phosphorus in surface water of early rice season under different phosphorus fertilizer rates in red soil region
This paper aimed to explore the dynamic change of yield and surface water phosphorus,in order to provide data support for water and fertilizer management in the red soil rice region.The experiment was carried out in 2022,Eight phosphorus application treatments were designed,including 0,26.6,33.8,41.1,48.3,55.6,62.8,70.1 kg/hm2(remarking as P0,P26.6,P33.8,P41.1,P48.3,P55.6,P62.8,P70.1 treatments,respectively).The phosphorus absorption and yield of early rice was measured,the change of total phosphorus concentration and content in the field water 0,1,3,5,and 7 days after fertilization was monitored,also the correlation between rice yield,phosphorus uptake,and total phosphorus content in surface water and the phosphorus fertilizer dosage was analyzed.The results showed that the phosphorus absorption of rice showed a trend of first increasing and then decreasing with the increase of phosphorus fertilizer dosage.The highest phosphorus absorption was observed in P55.6 treatment,followed by P48.3,P62.8,P41.1,P33.8,P26.6 and P70.1 treatments,but no significant differences were observed,with P0 treatment being the lowest.Through calculation,it was found that the optimal amount of phosphate fertilizer was 50.29 kg/hm2.The yield of early rice showed a trend of first increasing and then decreasing with the increase application of phosphorus fertilizer.The yield of P0 treatment was the lowest,followed by P26.6 treatment,both of which were significantly lower than that of other phosphorus treatments,and there was no significant difference between other treatments.The yield of P55.6 treatment was the highest,followed by P48.3 treatment,and the yield of P41.1,P33.8 treatment was slightly lower than that of P48.3 treatment.The highest yield occurred at 51.88 kg/hm2.The concentration and content of total phosphorus in surface water gradually increased with the increase of the amount of phosphorus fertilizer.The concentration and content of total phosphorus in surface water at each treatment increased first and then decreased after fertilization,and reached the peak value 1 day after fertilization,then began to decline and stabilized 3 days after fertilization.Based on the linear equation,it was found that there was a significant positive correlation(P＜0.05)between the total phosphorus content and the amount of phosphorus fertilizer applied in the field water from 0 to 7 days after fertilization.For every 1 kg/hm2 increase in phosphorus fertilizer applied at 0,1,3,5,and 7 days after fertilization,the total phosphorus content in the field water increased by 0.046,0.033,0.011,0.011,and 0.020 kg/hm2,respectively.Therefore,the suitable application amount of phosphorus fertilizer(P2O5)for the early rice season in red soil paddy fields in China was 51.09 kg/hm2.Within 3 days after fertilization was a high-risk period for phosphorus loss and drainage should be reduced.
different dosage of phosphate fertilizerearly ricechanges of phosphorus concentration in surface waterthe change of phosphorus content in surface wateryield
万方数据
维普
