滴灌磷肥分配比例对玉米磷素吸收利用的影响OA北大核心CSTPCD

The effects of different application periods and distribution ratios of phosphate fertilizer on maize yield and phosphorus absorption and utilization were studied under certain conditions of ir-rigation quota(150 mm)and phosphorus application amount(P2O5 80 kg/hm2)through integrated field experiment of drip irrigation under film.The results showed that the yield of P fertilizer applied in different stages(P2,P3,P4,P5)was higher than that of the total base application of P fertilizer(P1),among which the yield of P fertilizer applied in P4 treatment(P fertilizer 40％base application,P fer-tilizer 15％jointed top application,P fertilizer 35％bell mouth top application,P fertilizer 10％tas-seling top application)was the highest(12 370.0 kg/hm2),with an increase of 5.2％compared with P1 treatment.The application of phosphate fertilizer in different stages could improve the accumula-tion amount and rate of phosphorus in the plants after jointing stage.P4 treatment had the highest phosphorus absorption and accumulation,reaching 81.9 kg/hm2 in the mature stage.Jointing-bell mouth stage and tasseling-filling stage could be regarded as two important growth stages of phospho-rus nutrition regulation,and tasseling-filling stage was the most important stage.Compared with P,treatment,the utilization rate of phosphate fertilizer increased by 28.1％-87.0％,the partial produc-tivity of phosphate fertilizer increased by 2.0％-5.2％,and the agricultural efficiency of phosphate fertilizer increased by 22.4％-57.5％.