湖南衡阳、郴州一带有金属和非金属矿藏十多种。受矿藏影响,这里分布有多种特殊的土壤。如1975年发现常宁县的若干河谷盆地,历史上盛产柑桔、柚子,后改种水稻发生严重死苗,产量很低。增施各种肥料、开沟排水均无效果,施有机肥会加剧死苗。但插秧后重晒田、掺红土或改种旱作效果较好。1979年起多次采土分析,于1981年发现 Hunan Hengyang, Chenzhou along with a dozen of metal and non-metallic mineral deposits. Affected by the mineral, there are a variety of special distribution of soil. As found in 1975, a number of valleys in Changning County, the history of citrus, grapefruit, after the re-planting of rice serious dead seedlings, the yield is very low. Add a variety of fertilizers, ditching drainage no effect, organic fertilizer will exacerbate dead seedlings. However, after transplanting sunburn, red mud or replanting drought better. Multiple mining analysis since 1979, found in 1981