河北省柏各庄农场1956年建场,总面积103万亩,建场前土壤系海退地,为滨海重盐土,直接垦殖种稻发生严重死苗缩苗,958年水稻死苗缩苗3.6万亩,同年该场四农场种稻近万亩,平均亩产稻谷50公斤,缩苗严重地块颗粒无收。尤其最近几年,多年老稻田栽秧后发生严重缩苗。1988年,柏各庄农场水稻缩苗近万亩,滦南县达10万亩,通过调查访问,我国北方稻区栽秧后均不同程度的存在以上问题。为解决上述问题,河北省农垦科研所从1964年开始至1991年利用腐植酸肥料改良盐 Hebei Baigezhuang farm built in 1956, with a total area of ​​1.03 million mu, before the establishment of the soil of the sea back to the coastal heavy salt soil, direct reclamation rice serious dead seedlings shrunk in 958, In the same year, the four farms planted nearly 10,000 mu of rice and the average mu yield was 50 kg of paddy. In recent years, in particular, serious paddy seedlings have developed after many years of old paddy fields have been planted. In 1988, Baigezhuang farm paddy rice nearly 10,000 acres of seedlings, Luannan County, up to 10 acres, through the investigation and interview, after the rice planting areas in northern China have different degrees of above problems. In order to solve the above problems, Hebei Agricultural Reclamation Research Institute from 1964 to 1991 using humic acid fertilizer to improve the salt