旱地小麦群体生理变量对氮素供应量的响应

Effects of nitrogen nutrition on the physiological characteristics of wheat colony in dryland

试验研究不同N肥处理对旱作小麦群体结构参数、光合生理特性、产量及水分利用效率的调控效应结果表明,在一定N肥范围内小麦群体结构、分蘖数、光合速率、水分利用效率和产量均随施N肥量的增加而改善,但当N肥用量超过一定量时反而不利于群体结构和功能的改善。旱作农业生产中水肥间有明显耦合关系,肥料对作物增产作用依赖于土壤水分的优劣。

The coordinate effects on wheat structural parameter, leaf photosynthetic characteristics, yield and water use efficiency at different nitrogen levels in dry land farming were studied. The results show that the structural parameter, amount of tillers, leaf photosynthetic rate, water use efficiency and yield are increased with nitrogen supplies, but it is detrimental to the improvement of the colony structure and function when the nitrogen supply exceeds the suitable quantity. So there is a significant coupling relationship between soil water and fertilizer. The production increase depends on not only the fertilizer itself, but also the interaction between soil water and fertilizer.