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我场自1977年开展汕优2号大面积夏秋季制种工作,两年来都取得了较好的成绩,平均每亩制种产量稳定在100斤左右。1978年6月下旬开始出现了连续100天以上的严重干早,大部分田块出现旱情和母本花期偏早的现象。由于调节花期及时,措施有力,全场114.7亩制种田,平均亩产106斤,部分田块亩产160余斤。高温干旱天气对夏秋季制种有哪些影响,应该采取什么样的相应措施来减轻和避免危害呢?我们观察试验的结果是:一、温度与始穗、出叶速度的关系1977年和1978年,我们都是实行一季制种。花期安排在8月中下旬。即要求日平均气温不低于23℃,最高不超过35℃,连续3天以上晴天的保证率在80%
My field since 1977 to carry out a large area of Shanyou 2 summer and autumn seed production work, have achieved good results over the past two years, the average per acre seed production stabilized at 100 pounds. In late June 1978, there appeared serious dryness which lasted for more than 100 consecutive days. Most of the plots experienced a drought and the flowering of female parent was earlier than normal. Due to the timely regulation of flowering and effective measures, the entire field of 114.7 mu of farmland was planted with an average yield of 106 jin and some fields of more than 160 jin of mu yield. What are the effects of hot and dry weather on the summer and autumn seed production, what kind of corresponding measures should be taken to reduce and avoid the harm? The results of our observation and experiment are as follows: First, the relationship between temperature and initial spike and leaf speed 1977 and 1978 , We are all practicing seasonal production. Flowering arrangements in late August. That is required daily average temperature of not less than 23 ℃, the maximum does not exceed 35 ℃, for more than 3 days sunny rate of 80%