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1956—1957年全国农业发展纲要规定,要求在1962年以前,经过地区适应性的典型试验,普及各种农作物现有的优良品种,对于良种已经基本普及的作物,例如棉花则应当加强种子复壮工作,因为长期的自花授粉和近亲异花授粉,会引起品种生活力的降低;异品种间的天然杂交和种子混杂,也会引起品种纯度的降低。棉花为常异交作物,为保持品种在生产中的纯度,并使它具有较旺盛的生活力,须经常进行棉种复壮工作。中央农业部早于1955年就颁布了关于建立棉花良种繁育制度和技术的试行草案。1956年春召开了短期训练班,1957年在全国各地成立了45个棉花良种
The 1956-1957 National Plan for Agricultural Development stipulated that before 1962, the existing good varieties of crops should be popularized through typical tests of regional adaptability. For those crops that have already basically popularized the good crops, such as cotton, the work of rejuvenating seeds should be strengthened , Because of long-term self-pollination and inbreeding, pollination, will lead to reduced the viability of varieties; natural hybrids and hybrids of different varieties will also lead to reduced purity of varieties. Cotton is often outcrossed crops, in order to maintain the purity of the variety in production, and make it has a more viable vitality, the need for frequent rejuvenation of cotton. As early as 1955, the Central Ministry of Agriculture promulgated a pilot draft on the establishment of a cotton seed breeding system and technology. Short-term training courses were held in the spring of 1956, and in 1957 45 cotton seed varieties were established across the country