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20%酸化磷矿石是大豆所需磷素的良好来源。三年试验表明它比用浓过磷酸钙好。制造20%酸化磷矿石所需的磷酸仅为制造浓过磷酸钙的20%。85%以上的物
20% acidified phosphate rock is a good source of phosphorus for soybeans. Three years of tests show that it is better than concentrated superphosphate. The amount of phosphoric acid required to make 20% acidified phosphate rock is only 20% of the manufacture of concentrated superphosphate. Over 85% of objects