磷石膏农用研究的新进展蔡良（中国农科院土肥所）磷铵是重要的复肥之一。预计２０００年，我国磷铵的年生产能力将达６００万吨，副产磷石膏２０００万吨，磷石膏数量很大，必须寻求多方面的用途。在国家计委支持下，１９９１～１９９２年我们组织全国１６个协作单位，进... New Development of Phosphogypsum Agricultural Research Cai Liang (Soil and Fertilizer Institute, Chinese Academy of Agricultural Sciences) Ammonium phosphate is one of the important compound fertilizers. It is expected that in 2000, the annual production capacity of ammonium phosphate in China will reach 6 million tons and 20 million tons of phosphogypsum will be produced. There is a large amount of phosphogypsum, and many applications must be sought. With the support of the State Planning Commission, from 1991 to 1992, we organized 16 cooperative units in China