The effects of fertilization on nutrient absorption and yield formation of spring maize

The effects of fertilization on the leaf area coefficient,on absorption of nitrogen,phosphorus and potassium,and on accumulation and distribution of dry matter during all stages and economic yield of spring maize were studied.Also,the relationship between the above mentioned growth elements and economic yield was investigated.The results were as follows:Fertilization enhanced K absorption more obviously in the earlier stage of spring maize.To fertilizer treatment,the absorption of N and P occurred with two peaks during the whole life stage,and to control,only one peak in the earlier stage.Similarly,fertilizer application largely increased the leaf area coefficient at filling time,the amount of dry matter accumulation during the later stage and the economic coefficient.The correlation analysis indicated that the leaf area coefficient at filling time,amounts of potassium absorption during the earlier and middle stages,amounts of nitrogen and phosphorus absorption during the later stage and dry matter accumulation during each stage were significantly related with the economic yield of spring maize.