湘中丘陵地区的土壤60%是红壤,主要是由石灰岩、花岗岩、紫色砂页岩、第四纪红色粘土等母质发育而成。在650万亩稻田中,由红壤母质演变而成的水稻田约占50%左右。从1957年开始,连续二十多年来我们对湘中丘陵地区红壤稻田施用化肥的增产效果进行了一些试验研究,充分证明五十年代氮肥增产效果 60% of the soil in the hilly area of ​​Hunan is red soil, mainly composed of parent materials such as limestone, granite, purple sandstone and Quaternary red clay. Of the 6.5 million mu of paddy fields, about 50% of paddy fields are evolved from the parent material of red soils. Since 1957, for more than 20 consecutive years, we have conducted some experiments on the stimulation effects of chemical fertilizers on red rice paddy fields in the hilly area of ​​Central Hunan Province, fully demonstrating the effects of increased nitrogen fertilizer production in the 1950s