摘要
通过旱区农田蒸发对比观测、肥力梯度和品种对比试验得出：旱区水分利用效率与蒸发率直线负相关；与施肥量的关系为抛物线变化并推导出最大和最佳施肥量的求算公式；不同品种的水分利用效率有显著差异。依据上述规律提出了提高水分利用效率途径。
It is concluded through the contrast observation on cropfield evaportionand the experiments of fertilizer gradient and variety contrast that there is a linear nega-tive correlation between water use efficiency and evaporation rate in rainfed cropfieldsand that efficiency and the amount of fertilizer applicatio。 Also,a calculated formularfor the optimal and best fertilizer application is derived.The experiments showed thatthere was a significant difference in water use efficiency between various varieties。Based on the above laws an approach for efficency was suggested in the paper。
出处
《干旱地区农业研究》
CSCD
北大核心
1995年第1期14-19,5,共7页
Agricultural Research in the Arid Areas
关键词
农田
水分利用效率
作物
water use efficiency
evapo transpiration
maximum fertilizer appli-cation
optimal fertilizer application
fine crop variety
