难溶性 meaning in English

slightly solubility

Influence of three non - soluble minerals on slurryability of coal water slurry
3种难溶性矿物对煤成浆性的影响
That is to say , there was enrichment tendency for phosphorus , especially for po , with the increase of soil fertility . pi mainly occurred in ca - p forms in which ca10 - p made up most in 58 % ~ 61 % , while the amount of ca2 - p was very lower . po exists mainly in the form of mid - labile po ( around 66 % ~ 69 % )
在磷素的各种形态中，无机磷形态以钙磷为主，其中以难溶性的ca _ ( 10 ) - p占大多数，达58 - 61 ，而有效性强的ca _ 2 - p等较少；有机磷形态以中度活性有机磷为主，占66 - 69 。
This paper discusses how the silicate bacteria affect potassium releasing from minerals , especially the function mechanism during the interaction between bacterial and minerals ; the paper emphasize the problem such as the utilization of silicate bacteria to release significant amounts of potassium from soil minerals in the karst area , and at the same time the utilization of the silicate bacteria in the agriculture of karst area is discussed
主要探讨矽酸盐细菌的解钾作用，以及使难溶性矿物态钾转化为速效性钾的作用机理；同时在研究矽酸盐细菌解钾作用机理问题的基础上，重点探讨了喀斯特环境中利用矽酸盐细菌活化土壤中的矿物钾元素的问题，特别是矽酸盐细菌在喀斯特环境中农业上的利用。