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石膏是一种以二水硫酸钙(CaSO_42H_2O)为主要成份的天然矿石。我国长江中下游诸省稻谷产区历来有施用石膏作肥料的习惯,以往均系使用纤维石膏(俗称白石膏),而纤维石膏在我国年产量很低,只能满足市场需要量的30％。青石膏(普通石膏)与纤维石膏在岩层中呈互层状共生,经化验分析两种石膏主要成份一详,只是钙、硫含量有所不同。青石膏资源极其丰富。为了更好地满足农业生产的需要,我们参照国内外有关科技资料,于1980～1982连续三年进行了青石膏农用肥效试验,试验在湖北、江西两省等十余个县进行。供试
Gypsum is a natural calcium sulfate (CaSO_42H_2O) as the main ingredient of natural ore. The rice producing areas in the middle and lower reaches of the Yangtze River in the country have always had the habit of using gypsum as fertilizer. In the past, fiber gypsum (commonly known as white gypsum) was used. However, the annual output of fiber gypsum in China is very low, which can only meet 30% of the market demand. Green gypsum (ordinary gypsum) and fibrous gypsum in the rock strata were interbedded, laboratory analysis of the two main ingredients gypsum details, but calcium, sulfur content is different. Green gypsum resources are extremely rich. In order to better meet the needs of agricultural production, we refer to the relevant scientific and technological information at home and abroad, from 1980 to 1982 for three consecutive years of green plaster agricultural fertilizer test, the test in Hubei and Jiangxi provinces such as more than 10 counties. For the test