旱地土壤中的肥水激励机制

本文阐述了养分和水分对作物产量及其增产潜力的交互影响。肥和水既是作物产量的决定因素,又是人为的可控因素。作物需要的营养离子从土壤向根表面的移动,受土壤水分含量的影响,特别是在旱地。肥是土水系统的物质基础,水是肥效发挥的关键,二者互为制约,又互相促进。肥水激励机制要求二者有一个适宜的匹配,这样,养分和水分才能发挥其最大经济效益。

THE EXCITATION MECHANISM BETWEEN FERTILIZER AND WATER UNDER DRYLAND CONDITION

This paper described the interactive effects of fertilizer and water on yield and potential yield increase of crops. Fertilizer and water are decisive and controllable factors in agricultural production. The efficiency of fertilizer is siginificantly affected by soil moisture, escapcially in dryland. Fertilizer is the material base in water-soil system and water is a key factor in increasing fertilizer use efficiency. They are promotive and restrictive to each other. An excitation mechanism exists between fertilizer and water, which require a good management and proper balance of fertilizer and water, for the maximum economic benefit from use of these two limited resources.