Effects of different fertilizers application patterns on the dynamics of phosphorus concentration in surface water and rice yield in paddy fields
In order to explore the effects of phosphorus fertilizer reduction and new fertilizer application on the dynamic changes of phosphorus concentration in rice field surface water and rice yield cultivation in the Chaohu Lake Basin,a field experiment was started in May 2022 in Lujiang county,Hefei city.The experiment was set up with six treatments:control treatment (CK,no fertilizer),conventional fertilization (CF P2O5 with 90 kg·hm-2 phosphorus),phosphorus application was reduced by 20% (20% PR at P2O572 kg·hm-2) compared to conventional fertilization,conventional fertilization reduced phosphorus by 50% (50% PR at P2O550 kg·hm-2) and efficient controlled loss fertilization (CRF,phosphorus fertilizer at P2O590 kg·hm-2),slow release blended fertilizer (SRF with P2O590 kg·hm-2 phosphorus).The results showed that the application of the two new fertilizers reduced peak concentrations of total phosphorus (TP) and soluble phosphorus (DP) in the field water,with the peak concentrations of total phos-phorus (TP) and soluble phosphorus (DP) decreasing by 46.02% and 42.38% versus 49.29% and 44.71%,respec-tively,compared to the CF treatment,with the greatest reduction observed in CRF;the treatments with 20% and 50% phosphorus fertilizer reduction also significantly reduced peak TP and DP concentrations in the field water,and the peaks decreased by 12.78%,20.42% and 42.56%,45.28%,respectively,compared to the CF treatment;seven days after fertilization,TP and DP concentrations in the field water in each phosphorus treatment gradually decreased to lower levels and stabilized.In terms of yield,the application of both new fertilizers significantly increased the rice yield by 2.14%-8.59% (P<0.05);a 20% reduction in phosphorus fertilizer application did not have a significant ef-fect on the rice yield,whereas a 50% reduction in phosphorus fertilizer application resulted in a significant reduction of the rice yield by 12.06% (P<0.05).In conclusion,the application of new fertilizers can effectively reduce the con-centration of phosphorus in field water and increase crop yields,and the effect of efficient controlled loss fertilization is most obvious;20% reduction of phosphorus fertilizer not only reduces the concentration of phosphorus in field water but also has a certain effect on stable crop yields.The results provide a theoretical basis for the prevention of surface pollution and scientific management of nutrients in Chao hu Lake Basin.
Chaohu Lake Basinphosphate fertilizer reductionsynergistic compound fertilizerphosphorus concentrationyield
万方数据
维普
