Microsoft Word - 09李少昆.doc 关键词： 玉米；产量；增产因素；发展趋势 [gap=2931]Key words: maize; yield; yield increase factor; development trend
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Water is the main factor influencing crop yield in dryland areas, and the efficient way to increase crop yield is to improve utilization efficiency of precipitation.
水分是限制旱地作物产量最主要的因素，提高自然降水利用效率是增加旱地作物产量的有效途径。
The phosphorus fertilizer is the main restricted factor that the wheat (Jimai20) yield improves. Application of P and N fertilizer could obviously increase the wheat yield.
即在本试验条件下磷肥是济麦20产量提高的主要限制性因素，增施磷肥、适量施用氮肥可以提高其产量。
The increase of sterility rate was the direct factor causing yield loss.
空壳率的上升是造成产量损失的直接因素；
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