Effect of Meteorological Factors on Grain Yield of Summer Maize in the North China Plain

It is very necessary to analyze the effect of meteorological factors on the grain yield for Summer Maize(Zea mays L.) because the grain yield varied with the meteorological factors.So the 11-year field experiments were conducted in the Luancheng station to study the effect of meteorological factors on the grain yield.The regression methods were performed to analyze the change trend of meteorological factors and its impact on the grain yield.The results showed that the trend for average daily temperature in June,July and September was increasing and decreasing in August.As the sunshine hours,they were all significantly decreasing.The trend for grain yield for summer maize was increasing and the meteorological factor played a very important role which occupied 31.45%.The average daily temperature in the last ten-day of June,and the difference between daily maximum temperature and minimum temperature from 20th August to the 10th September,and the sunshine hours in the middle 10-day of July and in 10-day of September affected the changes of summer maize grain yield.