土壤质量优劣在很大程度上决定着农作物的产量,影响着农业的发展水平。某些外国学者计算,在水稻各项增产措施中土壤肥力因素约占40％。不少试验资料表明,形成有机体的氮素有60—80％来自地力氮。我省农业土壤中低产田土比重较大,严重阻碍着农作物产量的提高。 The quality of soil determines the output of crops to a great extent, affecting the level of agricultural development. Some foreign scholars have calculated that soil fertility factors account for about 40% of the increase in rice production. Many experimental data show that 60-80% of nitrogen forming organisms comes from soil nitrogen. The proportion of low-yielding soil in agricultural soil in our province is relatively large, which seriously hinders the increase of crop yield.