Effects Of Phosphorus And Potassium Fertilizer Application On Yield Of Drip Irrigation Maize And Phosphorus And Potassium Fertilizer Use Efficiency

This experiment is to determine the reasonable amount of phosphate and potassium fertilizer for drip irrigation corn in the semi-arid area of western Jilin Province.Hengdan 188 was used as the experiment material.The phosphorus and potassium fertilizer application rates were set to five treatments respectively.The treatment of phosphorus fertilizer（P₂O₅）includes:0,30,60,90,120 kg/hm²(respectively referred to as P₀,P₃₀,P₆₀,P₉₀,P₁₂₀),potassium fertilizer（K₂O）treatment includes:0,30,60,90,120 kg/hm²(respectively indicated as K₀,K₃₀,K₆₀,K₉₀,K₁₂₀).Explore the effects of different phosphorus and potassium fertilizer application rates on corn yield,phosphorus and potassium fertilizer utilization efficiency,dry matter,and phosphorus and potassium accumulation,and then explore its changing laws.The results show that:1.The application of phosphate fertilizer and potassium fertilizer can increase the yield of maize and its constituent factors significantly.With the increase of phosphorus fertilizer and potassium fertilizer application,the yield of maize firstly increases and then decreases,and the yields treated with P₉₀and K₉₀are the highest.The change law of maize yield components is consistent with the yield.By fitting the relationship between maize yield and the amount of phosphorus and potassium fertilizer application,the optimal phosphorus fertilizer application rate is 93.78kg/hm²;the optimal potassium fertilizer application rate is 106.21kg/hm².2.In terms of utilization efficiency of phosphate and potassium fertilizers,the seasonal recovery and partial productivity of phosphorus and potassium fertilizers decreased significantly with the increase of the application amount of phosphorus and potassium fertilizers.The contribution rate of phosphorus and potassium fertilizers showed a parabolic linear change with the increase of the application amount of phosphorus and potassium fertilizers.But it is not obvious.When the application amount was 90 kg/hm²,the contribution rate of phosphorus and potassium fertilizers was the largest.3.The application of phosphorus and potassium fertilizer can significantly increase the dry matter accumulation and accumulation rate of individual plants.The dry matter accumulation and accumulation rate of corn per plant show an increase and then a decrease with the increase of phosphorus and potassium fertilizer application,.The treatment with P₉₀and K₉₀The dry matter accumulation and accumulation rate per plant were the largest,and the application of phosphorus and potassium fertilizers was also beneficial to increase the dry matter accumulation of each organ.4.With the increase of phosphorus and potassium fertilizer application,the accumulation of phosphorus and potassium in maize increased first and then decreased to treat the maximum of P₉₀and K₉₀.Excessive application would inhibit the accumulation of phosphorus and potassium.5.The soluble sugar content,soluble protein content,leaf area index（LAI）,and SPAD value of the plants all increased firstly and then decreased with the increase of the amount of phosphate and potassium fertilizers.All indicators were treated with P₉₀and K₉₀the highest,while the excessive application will reduce the indicators.