摘要
磷石膏是磷肥厂废渣,做为化学改良剂已成功的用于碱土改良。此外,本试验证明,由于磷石膏含丰容的可溶性钙、硫、磷和微量元素,因此可做为低浓度肥料和微量元素供给剂,广泛的施在北方石灰性土壤上,其增产效果明显。如果用在碱化土壤上,可起到改良剂和肥料的双重作用。部分磷石膏含少量重金属和一定量的氟,但因重金属多以不溶解态存在,氟又在碱性条件下溶解度高,而在中性和酸性条件下溶解度低,所以施用磷石膏不会造成土壤与作物的污染。
Ardealite, a water residue from phosphate fertilizer factories, has been successfully used in the amelioration of alkaline soil as a kind of chemical amendment. In addition, as this test has proved, ardealite can also be used as a kind of fertilizer of low concentration and a kind of supplier or trace elements, because it contains abundant soluble calcium, sulphur, phosphorus and trace elements, Ardealite has been widely applied in the calcium soil of Northern China and its yield-increasing effect is evident. Ardealite applied in the alkline soil has a dual function of amendment and fertilization. Some kinds of ardealite contain small amounts of heavy metals and fluorine. Never the less, because most of these metals are in insoluble state, and the solubility of fluorine is high under alkaline condition and low under acidic or neutral condition, so that application of ardealite cannot result in the soil crop pollution.
关键词
磷石膏
碱性土
肥料
微量元素肥料
ardealite
alkaline soil
amalioration
fertilizer
micro-element
