Transcription of N-P-K FERTILIZERS
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N-P-K FERTILIZERS
Michigan State University Extension ! Extension Bulletin E-896 ! Reprint July 1996 Liquid or fluid fertilizer use in Michigan has in-creased steadily over the last 25 years. In 1965, 9% ofthe total fertilizer sales in Michigan consisted ofliquids. In 1988, liquid FERTILIZERS accounted for 28%of the market. Anhydrous ammonia and N solutionsaccounted for 78% of the total liquids FERTILIZERS (solids) still constitute the major partof the FERTILIZERS sold in Michigan. In 1988, 92% ofthe total dry fertilizer was sold as bulk material, withonly 8% in bags. The bulk materials are generally lessexpensive and easier to handle, particularly whenlarge quantities are used. Urea is the most popularsource of dry N fertilizer, accounting for 79% of thetotal dry N used.
Crop responses to liquid and dry fertilizer are similar, provided the same amounts of plant nutrients are applied and the same placement and water soluble P materials are compared. Reactions of these materials in soils are similar. When placed in the soil, dry fertilizers absorb water and undergo chemical reactions similar to liquid fertilizers.
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