Influence of climatic condition on the spike number per plant of wheat

The influence of climatic condition on the spikes number per plant of wheat in field experiments was studied.The results show that when the temperature reduces largely in early winter，the extreme temperature is low and the rain is little，the wheat will suffer from freeze injury.The influence of freeze injury on wheat is relative to the growth after it turns green.Under high-yield cultivation condition，the annual difference of spike number may be large.This is relative to the growth time of seedling after the year and the temperature.The more the growth time is，the more the number is.The right-time sowing of winter wheat can raise the rate of bearing and then raise the spike number.The late sowing of winter wheat can rise the growth time and make the verbalization come earlier.This can make the spikelet differentiation stage early and long in order to raise the spike number.If the growth time is long and the temperature is high，the fertilizer and water time should be later so as to prevent the population from growing larger，the basic joint from growing longer and the stem from lodging.