Comparison with Grain Filling Characteristic of Wheat Between Precipitation Growth and Irrigation growth

Choosing the four main winter wheat varieties which were breeding by Laiyang Agricultural College in the lately years,comparing with grain filling characteristic of wheat between precipitation growth and irrigation growth. We analyzed grain filling processes with Logistic equation,it showed that grain filling was faster and average rate of grain filling was increasing,furthermore peak value was higher under precipitation,but grain filling duration became short,peak value appeared in advance.Relative to rate,grain filling duration conduced to kilo-grain weight.Duration was short under precipitation,which resulted in decrease of kilo-grain weight.Therefore at the later period,the wheat should be irrigated in time,which could prolong grain filling duration and defer the decrease trend of rate,moreover would increase the grain weight.