施肥对春玉米养分吸收和产量形成的影响

研究了施肥对春玉米叶面积系数，氮、磷、钾吸收状况及干物质积累分配和经济产量的影响，并探讨了上述诸生长因素与经济产量之间的关系。结果表明，施肥使春玉米吸钾主要集中在前期的特性更加明显，全生育期的氮、磷吸收出现２ 个高峰（不施肥处理仅前期有１ 个氮、磷吸收高峰），灌浆期叶面积系数保持较高数值，后期干物质积累量大幅度提高，同时也使经济系数明显增大。相关分析指出，灌浆期叶面积系数，前、中期吸钾量，后期吸收氮、磷量及各生长发育阶段的干物质积累量均与经济产量显著相关

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.