Effect of Distribution Ratio of Phosphorus Fertilizer in Drip Irriga-tion on Absorption and Utilization of Phosphorus in Maize
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％.
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