a long term field experiment
a long term field experiment
一个长期的野外实验
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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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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