我省化肥企业都是六十年代以后从无到有、从小到大发展起来的。目前几乎没有一个企业还保持着原设计版型的规模和设备。特别是小氮肥企业,原设计多数属年产3000吨合成氨型,现在都已经过技术改造扩大为000吨、7000吨或10000吨,有的已着手改 Fertilizer companies in our province developed from scratch and grew from small to large after the 1960s. At present, almost no company still maintains the original design version of the scale and equipment. In particular, for small nitrogenous fertilizer companies, most of the original design is an annual output of 3,000 tons of synthetic ammonia, and now all of them have been technologically expanded to 1,000 tons, 7,000 tons or 10,000 tons, and some have begun to change.