不同营养水平下农大高油一号玉米光合性能研究

Studies on the Photosynthetic Performance of Maize "Nong Da Gao You-No.1"under Different Nutrition Levels

1987～1988年对处于不同营养水平条件下的夏玉米"农大高油一号"进行了以探讨叶片营养状况对其光合强度影响为线索的光合性能综合研究。结果表明:随着营养水平的提高,叶面积增大,光合时间延长,光合生产力增强。但器官干物质的转移率和对籽粒的贡献相对减小。玉米叶片光合强度与叶片中的氮含量关系密切,而与磷、钾关系稍差,但在营养水平较高或者氮素过多时,磷、钾往往成为叶片光合强度提高的限制因子。处于营养水平较高下的叶片其光合强度对光、CO_2等环境因素的变化反应较为敏感.本试验以纯氨225kg·hm^(-2)、五氧化二磷75kg·hm^(-2)、氧化钾187.5kg·hm^(-1)的营养水平,玉米叶片的光合强度最高、干物质生产最大、产量最高。

The relationship between leaf photosynthetic characteristics and nutritional situation of'Nong Gao You-No.1' was studied comprehensively under the field conditions in 1987 and 1988.The results are as follows: With the increase of nutrition level the leaf area,the duration of photosyn- thesis and the photosynthetic productivity increased,While the rate of translo- cation of dry matter and the contribution to the grain decreased relatively.Th- ere was a close correlation between leaf photosynthetic rate and N content. While the relation ship between leaf photosynthetic rate and P,K was not closely related,but under higher nutrition level or higher N supplied,P,K usually became limitting factors to raise the leaf photosyntyntelic rate.The leaf photosynthetic rate was sensitive to change of environmental factors such as light,co:under higher nutrition level 225kg.hm^(-2) and nutrition balance con dition.When the amounts of N,P205,K20 supplied were 75kg.hm^(-2),187.5mg.hm^(-2) in this experiment,the leaf photosynthetic rate was the highest,dry matter productin was largest.