The Settle of the Best Period in Hybrid Rice Breeding

In view of the male and female rice being sensitive to the clear and rainy weather in hybrid rice breeding,the continuous overcast or rainy weather that lasting 3 days or more is studied in terms of probability distribution by using the rainfall data (1961 — 1996) of Jianyang city. And the probability of occurance of overcast or rainy weather mentioned above during a period of ten days is also studied similarly. The best period of hybrid rice breeding in Northern Fujian is then settled.

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