关键词: 氮肥运筹, 氮肥运筹, 夏玉米, 产量, 品质, 氮肥利用率

Abstract: In order to mitigate the effects of drought,floods and other natural disasters on the adverse effects of agriculture and provid the climate basis for adjust the agricultural structure, Required further study in Guangxi in recent years the characteristics of temporal and spatial variation of precipitation;In this paper,research data are 91 weather stations in Guangxi from 1961 to 2004 rainfall data,The use of Mann-Kendall non-parametric test,analysis of nearly 44 years changes in precipitation characteristics of Guangxi;The results showed that Guangxi the average annual rainfall trend is an upward trend in the years 1961-2004,But the upward trend not obvious. The three time point mutations are 1967,1984 and 1994. Most of the site in Guangxi,the number of days of annual rainfall was a clear downward trend. Summer and winter precipitation in the extreme case strong upward trend in Change.The Change in space, Six sites showed a marked increase in annual rainfall trends. The number of days of rainfall in Guangxi, most of the site showed a significant downward trend.