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掖单2号（掖107×黄早4）是玉米生产上的骨干杂文种之一，在全国年推广面积均在670万公顷以上。但近年来，由于向土壤投入减少．加之病虫危害严重，致使林高整齐度低．制种产量提不起来，经济效益较差，影响了农民繁种的积渡性。经多年的调查研究，初步探明了制种产量偏低的原
Yedan 2 (Ye 107 × Huangzao 4) is one of the main types of miscellaneous essays on corn production, with an annual area of over 6.7 million hectares in China. However, in recent years, due to reduced input into the soil. Coupled with the serious pests and diseases, resulting in high uniformity of forest low. Seed production can not be raised, poor economic efficiency, affecting the multiplication of farmers multiplication. After many years of investigation and research, preliminary proved the low yield of the original production