Effect of Nitrogen,Phosphorus and Potassium Fertilizer Combined Application on Dry Matter Accumulation and Yield of Soybean

Much research showed that rational application of fertilizer could improve the growth and enhance yield of soybean significantly.Shandong province is one of most important soybean production area of China,but the problems of no-fertilizer and irrational fertilization in soybean production are widely existent,so the fertilizer application in this area has positive significance to enhance the soybean yield.Previous study most focused on single or two kinds of nitrogen(N),phosphorus(P2O5)and potassium(K2O)fertilizer combined application,and there was less research on combined application of all the three kinds of fertilizer.Soybeans cultivar Liaodou 11 and field experiment was adopted in spring of 2006 and 2007 year.The effect of N,P2O5 and K2O fertilizer combined application on dry matter accumulation and yield of soybean were studied used3414 fertilizer experiment design in order to obtain optimum ratio of the three kinds of fertilizer for high yield soybean production.Dry matter of soybean plant above ground increased constantly and of different part of plant showed dynamic change during the growth period of soybean.Significantly positive correlations existed between accumulation amount of N,P2O5 and K2O,which also significantly positive related with the dry matter accumulation amount and the assimilation ratio of N,P2O5 and K2O was 2.89∶1.00∶1.75.Combined application of nitrogen,phosphorus and potassium fertilizer could improve the yield of soybean significantly by 27.9%-43.2%.The dosage of N 50.0 kg·hm-2,P2O5 105.0 kg· hm-2and K2O 90.0 kg·hm-2(N∶P2O5∶K2O=1∶2.1∶1.8)was optimum ratio of the three kinds of fertilizers for the higher yield in soybean production in experiment area.