Greenworks (Beijing) Technology Co Ltd is one of leading manufacturers of speciality products for agriculture & horticulture in China. We own a high quality Leonardite mine in the Northern China. The Leonardite from the mine is rich in high contained active humic acid as well as natural chelate metal elements. We are very proud of listing in Top 20 main suppliers of humic acid in the world. (see New Ag International 2003 ) Meantime, we also manufacture amino acid based on vegetal protein like soybean, peanu...