The Optimum Sowing Time for Plastic-film Corn and the Application of Two Related Theories

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[1]Wu R X, Cui Z M, Pei T X, et al. Exploration of the optimum sowing time for dry-farming plastic-film corn in semi-arid area.North China Agriculture, 1999,14( Special Issue for Dry-farming Agriculture) :96. (in Chinese)[2]Yu S L. Crop Planting(northern
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