SSC 151
FERTILIZERS AND SOIL FERTILITY
| A fertilizer is any substance that is added to the soil to supply those elements required in the nutrition of plants. | |
| A fertilizer material or carrier is any substance that contains one or more of the essential elements. | |
| A mixed fertilizer is a mechanical or chemical combination of two or more fertilizer materials and which contains two or more essential elements. | |
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A complete fertilizer contains the three major plant-nutrient elements - nitrogen, phosphorus, and potassium. |
| Fertilizer grade refers to the minimum guarantee of the plant-nutrient content in terms of total nitrogen, available phosphorus pentoxide, and soluble potassium oxide (6-24-24 for example). | |
| Fertilizer ratio refers to the relative percentages of nitrogen, phosphorus pentoxide, and potassium oxide (a 6-24-24 grade has a 1-4-4 ratio). | |
| A filler is make-weight material added to a mixed fertilizer of fertilizer material to make up the difference between the weight of the added ingredients required to supply the plant nutrients in a ton of a given analysis and 2,000 lbs. | |
| Dry bulk blending is the process of mechanically mixing solid fertilizer material. | |
| Clear liquid fertilizer is one in which the NPK and other materials are completely dissolved. | |
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Conversion factors : %P
x 2.29 = %P2O5 |