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我县1989年开始大面积推广杂交早稻,但在早杂秧田期发生了严重的徒长现象,一般丘块徒长株率达30％左右,严重的达80%以上。由于徒长苗的出现,早杂插秧期推迟了5～7天,秧苗普遍超龄,部分丘块被迫改种,影响了杂交早稻优势的发挥。1990～1991年,我县在推广早杂过程中,采取综合措施防徒长,使徒长株率普遍控制在3%以下。其做法是: 1.反复淘洗种子。杂交早稻种子用清水反复淘
In 1989, a large area of early hybrid rice was popularized in our county. However, in the early hybrid rice field, serious leggy growth occurred. Generally, the rate of leggy growth was about 30% and the rate was more than 80%. Due to the appearance of legumes, early hybrid rice seedling delayed 5 to 7 days, the seedlings are generally over-aged, and some of the hillocks were forced to replant, affecting the advantages of hybrid early rice to play. From 1990 to 1991, our county adopted comprehensive measures to prevent suffering during the promotion of early miscellaneous grains. The appropriation rate of antecedents was generally below 3%. The practice is: 1. Wash the seeds repeatedly. Hybrid early rice seeds repeatedly washed with water