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丹玉6号玉米是我所培育的一个单交种。1972年开始大面积推广,由于它具有高产、稳产、抗病、适应性广等特点,种植面积迅速扩大。据1978年调查,全国二十多个省、市、自治区都有种植,总面积最高达到3,000万亩。这个杂交种在生产中推广应用已经十多年,它的丰产性、抗病性有降低的趋势。据初步了解,当前存在的主要问题有:一是亲本种子混杂退化现象比较普遍,商品杂交种的质量也有所降低。二是没有按照丹玉6号生育特性进行合理栽培,影响了单位面积产量的进一步提高。为了进一步发挥丹玉6号的杂种优势,针
Dan Yu 6 corn is a single cross breed that I nurture. Since 1972, large-scale popularization has taken place. Due to its characteristics of high yield, stable yield, disease resistance and wide adaptability, the planting area has rapidly expanded. According to the survey conducted in 1978, more than 20 provinces, cities and autonomous regions all over the country planted the land with a total area of up to 30 million mu. This hybrid has been popularized and applied in production for more than ten years, and its high yield and disease resistance have been declining. According to the preliminary understanding, the main problems currently exist are as follows: First, the phenomenon of mixed degeneration of parental seeds is relatively common, and the quality of commercial hybrids is also reduced. The second is not in accordance with Dan Yu 6 reproductive characteristics of a reasonable cultivation, affecting the further improvement of yield per unit area. In order to further play Dan Yu 6’s heterosis, needle