白善土主要分布于湖北的东部和中部的低山丘陵地区,面积很大,约占耕地面积的16％左右(孝感专区统计),为黄岡、孝感两个专区的稻、麦两熟之基本农田。土质比较肥沃,耕性良好,水源充足,利用集约,产量也很高,平均单产水稻600—700斤/亩,高产1,200斤/亩,小麦250—300斤/亩,所以,生 White sandy soil is mainly distributed in hilly areas in eastern and central Hubei Province, covering a large area, accounting for about 16% of the total cultivated area (Xiaogan Prefecture Statistics). It is the basic farmland for rice and wheat two crops in Huanggang and Xiaogan prefectures . Soil fertility, good tillage, adequate water, the use of intensive, high yield, the average yield of 600-700 kg of rice per mu, yield 1,200 kg / mu, wheat 250-300 pounds / mu, so students