氮钾营养对春玉米后期碳氮代谢与粒重形成的影响

 采用田间试验与生化分析等方法研究不同氮钾用量下春玉米后期碳氮代谢与粒重形成的关系。结果表明，适宜氮钾用量下，玉米叶片可溶蛋白含量较高，RuBP羧化酶和PEP羧化酶活性较强，收获指数与氮收获指数较高。适宜的氮钾用量可促进玉米营养体碳氮向籽粒运输，同时提高生长后期叶片的光合能力及根系的氮素吸收。

Effect of N and K Nutrition on Post Metabolism of Carbon and Nitrogen and Grain Weight Formation in Maize

Study on grain weight formation in relation to the postgrowing period interaction between metabolism of carbon and nitrogen as influenced by N and K nutrition was carried out by field experiment and biochemistry analysis. The results confirmed that it was necessary to maintain a higher photosynthetic capacity of leaves and abundant N supply for root at later growing stages. The soluble protein content, RuBPC and PEPC activities in leaves, harvest index(HI) and harvest index of nitrogen (HI N)increased obviously with appropriate N and K application rate, which accelerated C and N translocation from vegetative parts to grain, enhanced photosynthetic capacity of leaves and abundant(but not excessive)N supply for root during post growing period.