Abstract: Based on randomized block experimental design,the nutrient absorption characteristics of maize,fertilization effects and soil nutrients supply capacity were investigated in order to provide reference for rational fertilization in coastal saline areas.The results showed that N,P₂O₅ and K₂O contents of maize grain were 1.224%,0.480%,0.377%,respectively;and the N,P₂O₅,K₂O contents of straw were 0.820%,0.142%,2.552%,respectively.N,P and K amounts required per 100 kilogram economic outputs of maize were 1.92,0.60,2.55 kg,respectively.The maize yield increment rates by the application of N,P,K fertilizer were separately 44.39%,13.79%,6.55%,and the maize yield increment per kilogram of N,P,K were separately 9.44,8.38,2.83 kg.Fertilization effect on maize yield showed the trend of N>P>K.Fertilizer usage efficiency of N,P,K fertilizer were separately 19.96%,5.60%,30.64% under this experimental condition.The equation of fertilization effects on maize was obtained by mathematic simulation,and the optimum economic amounts of N(N),P(P₂O₅),K(K₂O)were 348.5,133.6,19.1 kg/ha,respectively.Soil nutrient correction coefficients of N,P,K were 52.06%,190.30%,32.67%,respectively.The relative yields of N,P,K were 69.26%,87.88%,93.85%,respectively.The experimental results indicated that soil N supply capacity was low,soil P,soil K supply capacity were at the medium level.The order from high to low was K>P>N.Therefore,in the coastal saline maize fertilization process,we should pay attention to nitrogen,phosphate fertilizer application,reducing the amount of potash,in order to obtain high yield and get higher economic efficiency.

Key words: Coastal saline soil, Maize, Fertilization effects, Soil nutrient supply capacity

CLC Number: 

• S158.5