Characteristics of Nutrient Accumulation and Soil Inorganic Nitrogen Residue in Summer Maize under Split Fertilization with Drip Irrigation
Under drip irrigation,using Zhendan 958 as the test material,four treatments for NPK fertilizer sup-ply were designed to explore the effect of split application of NPK fertilizer on nutrient uptake of summer maize and soil inorganic nitrogen residue.The result showed that the maximum absorption rate of nitrogen and phosphorus was from the V12 to the R1 stage,respectively,while for potassium,it was from the V6 to the V12 stage.The accumula-tion of nitrogen and phosphorus from R1 to R6 accounted for 43.05％-54.07％and 41.76％-52.27％of the total growth stage,respectively,while potassium was less absorbed.Among all treatments,at the V12 stage,the phospho-rus content of plant in the T3 treatment was significantly lower than that in the T2 treatment(-29.18％,2019)and CK(-17.61％,2020).At silking stage,the potassium content of the T1 treatment was significantly higher than that of the T3 treatment by 30.73％(2019)and 20.51％(2020).Compared with CK and T2,nitrate nitrogen and ammonium nitrogen in T1 and T3 decreased in different degrees.For all treatments,the average values of N,P2O5,K2O ab-sorbed per 100 kg kernel yield were 2.31 kg,0.90 kg and 2.09 kg,respectively.Under drip irrigation in summer maize,the proportion of fertilizer application at sowing,V12 and R1 stage was suggested as T1 treatment,i.e.nitro-gen fertilizer 40％∶20％∶40％;phosphorus fertilizer:35％∶25％∶40％;potassium fertilizer:75％∶25％∶0,which could meet the nutrient demand of maize at different growth stages,and reduce the inorganic nitrogen residue in soil.
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