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1情况分析张掖市玉米制种产业经过多年的快速发展,存在着较为严重的连作问题,制约了张掖种业的健康持续发展。张掖市玉米制种产业起步于20世纪70年代,经过超过40年的快速发展,已成为全国面积最大、影响力最深的市级玉米制种基地。但是由于全市玉米制种面积多年趋于稳定,轮作倒茬困难,土壤没有休养生息的机会,制种基地连作现象突出,严重影响了张掖市国家级玉米制种基地的持续健康发展。张掖市玉米制种面积常年稳定在6.7万hm2左右,年
1 Situation Analysis After many years of rapid development of the seed production industry in Zhangye City, there is a serious continuous cropping problem that has restricted the healthy and sustainable development of Zhangye’s seed industry. Zhangye City corn seed industry started in the 1970s, after more than 40 years of rapid development, has become the country’s largest and most influential city-level corn seed production base. However, due to the stabilization of the area for maize production in the whole city, it is difficult for the crop rotation to be reversed and the soil does not have the chance to recuperate. The phenomenon of continuous cropping in the seed production base has seriously affected the sustainable and healthy development of the national seed production base of Zhangye City. Zhangye City, the annual area of maize species stable at about 67,000 hm2, year