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回顾山东省抗虫棉的引进、示范、推广工作 ,大体经历了三个阶段 :1 盲目引进阶段 (1 993~ 1 995年 )1 993年秋山东省平原、武成、安丘三县从中棉所引进R93- 3、R93- 4、R93- 5等抗虫棉种子 ,1 994年试种330hm2 。由于当时抗虫棉品系世代低 ,还处于严重分离状态 ,其抗虫?
Reviewing the introduction, demonstration and popularization of insect-resistant cotton in Shandong Province, we generally experienced three stages: 1 Blind introduction (1 993-1955) In the autumn of 1993, the three counties in Shandong Plain, Wucheng and Anqiu County, The introduction of R93 - 3, R93 - 4, R93 - 5 and other insect - resistant cotton seeds, 1994 test 330hm2. Because at that time insect-resistant cotton strains from generation to generation, is still in a serious separation, its insect?