Based on the data of a long term field experiment of dryland crops, this article points out that yield fluctuation, expressed in fluctuating coefficient, is a regular phenomenon in dryland farming.

根据旱地作物长期田间试验数据，论述了旱作农业生产中作物产量波动性是一个规律性现象，并用波动系数加以表述。

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This paper took field experiment for studying the effect of covering straw on some properties of mulberry soil fertility with long-term no-tillage.

应用田间试验的方法研究在长期免耕条件下覆盖对桑园土壤某些肥力性状的影响。

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The WUE increased respectively by 24.1% and 95.2% in NP treatment in two experiment; Comparing with long term experiment, the WUE in field comparison experiment increased by 46.5% to 290.0%.

两试验中氮磷配施的水分利用率分别提高了24.1%和95.2%，大田对比试验各处理的水分利用率较长期定位试验增加了46.5-290.0%。

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