论文部分内容阅读
棉花适期早播,是争取苗全苗壮、促苗早发的重要措施。棉花种子发芽的最低温度10—12℃。在一定温度范围内,5厘米平均地温愈高,发芽愈高,如下表:5厘米平均温度 C 10—12 15 20 25播种到出苗的天数 30以上 14 7—10 5—6由表可以看出,温度低会大大延迟出苗时间。据试验,5厘米地温低于或等于5℃的时数持续一小时,烂种数量即增加1%。原因是:棉籽在1—5天的萌发期间,如果
Cotton suitable for early sowing, is to fight the whole seedlings Zhuang Zhuang, Miao early seedling an important measure. Cotton seed germination minimum temperature 10-12 ℃. In a certain temperature range, 5 centimeters average higher ground temperature, higher germination, as follows: 5 centimeters average temperature C 10-12 15 20 25 sowing to the emergence of more than 30 days 14 7-10 5-6 can be seen from the table , Low temperature will greatly delay the emergence time. According to the test, the duration of 5 cm ground temperature is lower than or equal to 5 ℃ for one hour, the number of rotten seeds increased by 1%. The reason is: Cottonseed germination in 1-5 days, if