During the flowering period of maize, if it encounters continuous rainy weather, the reasons for the decline of maize yield are a. low temperature and immature pollen B. heavy rain,

Test and analysis: Cross-pollination is often easily restricted by environmental conditions, and there is no opportunity for pollination, such as windless pollination, insect pollination with strong wind or low temperature, and lack of enough insects to fly out for pollination, thus reducing the opportunity for pollination and fertilization and affecting the yield of fruits and seeds. Corn flower is an anemophilous flower. If it rains continuously, the pollen will be washed down by the rain, which will affect the wind-borne pollination, and the ear of corn often lacks grains.