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Word Count: 239
Fertilizer is a substance added to soil to help plants grow Fertilizer is divided into two groups natural and synthetic Fertilizer provides one or more of the chemical elements essential for plant nutrition Natural fertilizers are items like animal excrement straw other plant materials guano animal tankage and meat and bone meals and bone meals and flours All natural fertilizers are from nature Synthetic fertilizers come in either liquid or solid They are usually classified into 10 groups nitrogen fertilizers it can make the soil acid ammonia a kind of fertilizer that contains 82 nitrogen ammonium nitrate is made by oxidizing ammonia ammonium sulfate and ammonium chloride mostly made from synthetic ammonia urea a fertilizer that is 45 to 46 nitrogen and made by combining ammonia with carbon dioxide others fertilizers that are only important in few places for special crops phosphate fertilizers made from deposits of rock phosphates superphosphates made by reacting rock phosphate with sulfuric acid basic slag or Thomas slag a by-product of steelmaking and potassium fertilizers fertilizers that are water soluble Synthetic fertilizers are also called chemical fertilizers They have three groups of elements involved in making them The primary elements include nitrogen phosphorus and potassium These elements are required in the biggest amount The secondary elements are sulfur calcium and magnesium These elements are required in smaller amounts The other elements are boron cobalt copper iron manganese molybdenum and zinc These elements are only required in trace amounts
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