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        Alibaba.com offers 4,652 soil improvement products. About 16% of these are biological fertilizer, 4% are sulphate, and 1% are phosphate fertilizer. A wide variety of soil improvement options are available to you, such as magnesium sulphate, ferrous sulphate, and potassium persulfate. You can also choose from agriculture grade, industrial grade, and food grade. As well as from free samples, paid samples. There are 4,635 soil improvement suppliers, mainly located in Asia. The top supplying countries are China (Mainland), India, and Japan, which supply 93%, 3%, and 1% of soil improvement respectively. Soil improvement products are most popular in Southeast Asia, Mid East, and Africa. You can ensure product safety by selecting from certified suppliers, including 4,122 with ISO9001, 1,755 with FSC, and 134 with Other certification.
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