黄泥土是江淮丘陵地区占耕地面积最大、瘠薄易旱的低产土。这个地区的农民有在黄泥土上实行山芋間作花生,以达到用地与养地相結合、提高經济收益的經驗。我們从1960年秋开始,在調查总結农民这一經驗的基础上,进一步研究并証实了这一措施的有效性。从土壤水份和养料来看,据測定,单作山芋的土壤含水量为12.2—14.0%,山芋間作花生的土壤含水量则提高到14.0—18.6%,至于提高土壤含水量的原因,主要是因为花生的复盖,使土温比单作山芋的低摄氏一至三度,减少了土壤水分的蒸发。从氮素养料来看,由于花生的固氮作用,增加了土壤的氨态氮含量,間作地的氨态氮是4.0ppm,单作地的是3.0ppm。同时,由于这种土壤有丰富的鉀,磷、鈣也不少,間作花生后,能大大提高磷、鉀、鈣等矿物质养料的利 Yellow clay soil is the area with the largest arable land in Jianghuai hilly area, with barren and drought-prone low-yielding soil. Farmers in this area have inter-plantation of potato for peanuts on yellow soil so as to achieve the combination of land use and raising of farmland, so as to increase their economic returns. From the autumn of 1960, we investigated and confirmed the validity of this measure based on the investigation and conclusion of the experience of peasants. Soil moisture and nutrients from the point of view, according to the determination of single potato soil moisture content of 12.2-14.0%, potato intercropping peanut soil moisture increased to 14.0-18.6%, as to improve soil moisture reasons, the main Because of the coverage of peanuts, the soil temperature is one to three degrees Celsius lower than that of a single potato, reducing the evaporation of soil moisture. Nitrogen nutrients from the point of view, due to the role of peanut nitrogen fixation, increasing soil ammonia nitrogen content, intercropping ammonia nitrogen is 4.0ppm, alone to the ground is 3.0ppm. At the same time, due to the soil is rich in potassium, phosphorus, calcium is also less, intercropping peanuts, can greatly improve the phosphorus, potassium, calcium and other mineral nutrients