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恩单2号玉米杂交种(简称N_2)自我所1973年育成以来,由于它具有较高的杂种优势,对山区客观存在的低温、高湿、寡照等不良气候有较强的适应力,苗期弹性大,耐荫蔽,适宜间作套种等优点,种植面积发展很快,全州1978年曾达180多万亩,约占玉米播种总面积的80％,对提高玉米产量发挥了巨大作用。1983年全州种植N_2的面积仍达127万亩;西南六省种植面积375万亩,是这些省份种植面积最大的杂交种。因此,进一步分析它的丰产性和适应性,采用综合措施延长其利用年限,是十分必要的。
Due to its high heterosis, Enning No.2 maize hybrid (abbreviated as N_2) has strong adaptability to mountainous areas such as low temperature, high humidity and low temperature. Flexible, shade-resistant, suitable intercropping intercropping advantages, planting area developed rapidly, the state had reached 180 million mu in 1978, accounting for about 80% of the total area of corn sown, to improve the yield of corn has played a huge role. In 1983 the state planted N_2 area still amounted to 1270000 acres; Southwest six provincesArea of 3750000 acres, is the largest of these provinces planted hybrids. Therefore, further analysis of its high yield and adaptability, the use of comprehensive measures to extend its useful life is very necessary.