有些单位或个人利用农药厂或化工厂未加处理的废酸,制造废酸磷肥冒充过磷酸钙出售,这是值得严重警惕的。废酸磷肥中含有高浓度三氯乙醛。小麦对这种有毒物质最敏感,麦苗接触,生长锥即发生特异变形,轻者严重减产,重者绝收。近年来,一些地方受害绝收的麦田少的几千亩,多的十几万亩。三氯乙醛对水稻、玉米等也有一定的毒害。施用废酸磷肥还会严重污染农田,受污染土壤一般要经过七十天(一般土)到一百天(酸性土)才能再种作物。防止这种毒害,首先是对欲购进的过磷酸钙慎重选择,可请当地农业技术推广站代为检验;如磷肥中的三氯乙醛超过限度标准就不要购进。其次是对购进的磷肥 Some units or individuals use pesticide plants or chemical plants untreated waste acid, the production of waste acid phosphate as a superphosphate sale, it is worth serious guard. Waste acid phosphate contains high concentrations of chloral. Wheat is the most sensitive to such toxic substances, wheat germ exposure, the growth cone that is a special deformation, the light serious reduction in production, and those who receive the most. In recent years, a few acres of wheat scarcely harvested in some places have been harmed, and more than ten million mu have been harvested. Chloraldehyde on rice, corn, also have some poison. The use of waste acid phosphates can also pollute the farmland severely, and contaminated soils generally need to pass through seventy days (normal soil) to one hundred days (acidic soil) to re-plant the crop. To prevent this poisoning, the first is to purchase carefully selected superphosphate, may request the local agricultural extension station on behalf of the test; such as phosphorus in chloral hydrate exceeds the limit standards do not buy. Followed by the purchase of phosphate fertilizer