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一、感光性在热带水稻品种中,虽然也有非感光性品种,但是感光性的品种还是多的。热带纬度低,一年内日照时间的变化比温带小的多。在日本最长的日照为15个小时左右,最短日照还不足10个小时,年内相差达5个小时。在热带地区,最长日照时间13个小时,即使是最短日照也接近12个小时,最长和最短日照时间相差1—2个小时,而且还有很多地方日照时间相差比这还小。这是指一年内的日照时间的差异。若依水稻的主要栽培期,最长最短日照之差虽可缩小,但尽管这样仍和温带之间有
First, the sensitivity of tropical rice varieties, although there are non-photosensitive varieties, but still more varieties of photosensitive. Low tropical latitude, the change of sunshine time within a year is much smaller than that of temperate zone. The longest sunshine in Japan is about 15 hours, the shortest sunshine less than 10 hours, a difference of 5 hours during the year. In the tropics, the longest hours of sunshine are 13 hours, even the shortest sunshine is close to 12 hours, the longest and shortest hours of sunshine are 1-2 hours apart, and in many other places the difference of sunshine duration is smaller than this. This refers to the differences in sunshine hours during the year. If according to the main cultivation of rice, the difference between the longest and shortest sunshine can be reduced, but in spite of this is still between temperate