Analysis on Factors Affecting Grain Production of Nanning City

Based on the statistic data of Nanning City from19972003,this paper used grey corselativity analysis,production function approaches to analyze key factors and growth contribution of grain production.The order of GCA is: production of per land area arable land area grain planting area fertilizer input irrigation area rural electricity consumption agricultural machinery gross power pesticide dosage.The contribution to grain production is chemical fertilizer input(40.08%)、agricultural technology progress(27.62%)、grain planting area(12.12%),agricultural machinery gross power(10.78%),irrigation area(8.91%),amount of agricultural labor(0.49%).The result showed that production of per land area,amount of arable land area grain planting area have great influence on grain total production,the growth of grain production of Nanning mainly depends on chemical fertilizer input and agricultural technology progress,while the agricultural labor has very few effects on the grain production.