Phytoplankton, like land plants, require nutrients such as nitrate, phosphate, silicate, and calcium at various levels depending on the species.
浮游植物与陆地植物一样，根据不同种类需要各级的硝酸盐、磷酸盐、硅酸盐以及钙等营养物质。
2
The waste residue discharged from the production of compound phosphate fertilizer occupies large area of land and pollutes surrounding environment, which causes environmental problems hard to control.
磷复肥生产排放的磷石膏废渣堆存占地，污染环境，已成为亟待解决的难题。
3
The soil available phosphate was lower than that of wheat-corn rotation land, but higher than that of vegetable land and spring abandoned land. secondly, during the edible fungi growing in field, t…