牛皮碱也叫瓦碱,是一种碱化土。在黄淮海平原分布很广。冀、鲁、豫、苏、皖各省部有,尤其是淮北平原更多。据一九六三年调查,商丘地区有66万亩,内民权县有3万亩,人和公社有5000亩,几乎分布在各大队。牛皮碱和一般盐土不同,其含盐量很低,0.2%左右,但碱性大、碱化度高,都在 Leather base is also called alkali, is a alkalized soil. In the Huang-Huai-Hai Plain is widely distributed. Hebei, Shandong, Henan, Jiangsu and Anhui provinces have, especially the Huaibei plain more. According to the 1963 survey, there are 66 million mu of Shangqiu area, 30,000 mu of civil rights counties, and 5,000 mu of people and communes, which are almost distributed among the brigades. Leather caustic soda and salt is different from ordinary, the salt content is very low, about 0.2%, but the alkaline, high alkalinity, all in