锌素调节下棉花叶绿素和产量的协同响应

应用大田试验研究了外源锌素调节对棉花叶绿素和产量影响的相关性。结果发现,不论锌素水平高低,棉花功能叶叶绿素含量都在盛蕾期最高。但在不同生育时期,叶绿素含量随锌水平的变化是不同的,此结果源于棉花不同生育时期对锌的代谢能力差异及光合作用积累物质的不同。锌素水平与经济产量之间呈现显著的一元二次相关关系。所拟合的肥料效应方程为y=-0.1625x2+7.8751x+280.56。但边际产量随着施锌水平的增加呈现的趋势是:快(正)-慢(正)-快(负)-慢(负)。不同生育时期,棉花功能叶叶绿素含量出现最大时所需施锌量分别为:苗期为20 kg/hm2,盛蕾期为10 kg/hm2,盛花期为30 kg/hm2,铃期为20 kg/hm2,吐絮期为30 kg/hm2。

Research on relativity of cotton chlorophyll and yield by zinc regulation

A field experiment was conducted to study the relativity of cotton chlorophy and yield by zinc regulation. The results showed clearly that regardless of high or low levels of zinc, cotton leaf chlorophyll content was highest inflourishing bud period. However, at the different stages, changes of chlorophyll content to zinc levels were different,which resulted from the differences of metabolism capabilities and substances accumulating power through photosynthesis. A binary correlativity showed between zinc level and cotton yield. Fitting equation was y=-0.1625x²+7.8751x+280.56. However, the trends of marginal production by increasing zinc level were: quick (positive)-slow(positive)-quickly (negative)-slow (negative). At different growth stages, zinc levels for the largest value of chlorophyll con-tent of cotton functional leaf were: 20 kg/hm² in seedling stage, 10 kg/hm² in flourishing bud period, 30 kg/hm² in full flowering stage, 20 kg/hm² in bell stage and 30 kg/hm² in boll period.