施肥对土壤供肥和冬小麦养分吸收及其产量的影响

Effects of fertilization on soil supply and crop absorption of nitrogen and phosphorus and the yield of winter wheat

通过研究施肥对冬小麦各生育时期土壤供应氮、磷和作物吸收及其产量的影响 ,以及这些因素之间的关系表明 ,与施肥前土壤相比 ,1 5 0 kg/hm2 以上的施磷量明显提高了冬小麦整个生育期的土壤速效磷水平 ,而各施肥处理在小麦拔节后即没有明显提高土壤碱解氮水平的效果。和不施肥处理相比 ,施肥明显提高了冬小麦各生育期土壤的有效氮、磷含量 ,使冬小麦中期吸氮高峰进一步加强 ,使小麦灌浆中期—成熟阶段增加 1个磷素吸收高峰(不施肥处理仅孕穗至灌浆初期一个吸磷高峰 )。相关分析表明 ,施肥量

Effects of fertilization on soil supply and crop absorption of nitrogen and phosphorus and the yield of winter wheat were studied. Also, the relationship between them was investigated. The results were as follows: Compared with original soil, the rate of P fertilizer more than 150 kg/hm 2 increased obviously available P in soil at all stages of winter wheat,while all rates of N fertilizer didn't raise Conway's N in soil after wheat shooting. By contrast with control, fertilization largely increased the contents of available N and P in soil at all stages. So, fertilization enhanced the peak of N absorption in middle stage of winter wheat more obviously. To fertilizer treatment, the absorption of P occurred with two peaks during the whole life stage, and to control, only one peak in the period of booting to beginning of filling. According to the correlation analysis, there was a significantly positive correlation between the amount of fertilizer application and supply capacity of soil N and P, soil supply and the amount of N and P absorption, and between nutrition absorption and the yield of winter wheat.