中文摘要：

运用Meta-Analysis法研究玉米氮肥利用与气象和环境因素的关系。结果表明,在砂质粘壤土和粉砂壤土中玉米氮素利用的响应比最大;地理纬度为39°—42°N时,玉米氮素利用的响应比最大;气象因素对玉米氮素利用的影响为：在玉米生长前2个月,降雨均匀度对玉米氮素利用的影响较气温和降雨量大,在玉米生长中期,降雨量对玉米氮素利用的影响最大;在玉米生长后期,降雨均匀度、气温和降雨量都对玉米氮素利用的响应比有重要影响。

英文摘要：

Meta-Analysis is an expression used to identify a set of statistical techniques developed to provide an objective comparison of research results from independent studies.A meta-analysis combines the results of several studies that address a set of related research hypotheses.In this study,a meta-analysis was performed on the relationship between the application rates of nitrogen fertilizer and the corn yield response in order to understand the effects of climate（air temperature,rain） and environmental conditions（latitude,soil surface textures）.The climate influenced nitrogen requirements.Corn grown on silt clay loams,and to a smaller extent on silt loams,were most responsive to added N.Latitudes from 39°N to 42°N were the most favorable to corn N response.During the first two months of corn growth,the effect of rain evenness on N response was larger than that of temperature or precipitation.For the mid-season period,the effect of precipitation was higher than the ones of temperature and rain evenness.For the last part of the growing season,all three factors were of equally importance for N response.