Simple Calculation of Fertilizer Amount and Increased Efficiency of Soil Testing and Formulated Fertilization
The scientific and advanced nature of soil testing and formula fertilization lies in that it can measure the existing nutrients in the soil, and scientifically and reasonably supply various nutrient elements according to the target yield of crops. The ratio of fertilization and nutrients is truly reasonable, and fertilizer is not wasted. Taking nitrogen, phosphorus, and potassium as examples, the recommended fertilization amount on the formula fertilization table is pure nitrogen, phosphorus pentoxide, and soil fertility. The amount of potassium oxide. As the effective content of various chemical fertilizers is different, it is not easy for farmers' friends to accurately grasp the physical amount of fertilizers in the actual production process. Therefore, the author now describes a relatively simple and practical method for calculating the amount of fertilizer applied to the soil.
Assume that the recommended fertilizer amount for a plot is 8.5 kg of pure nitrogen per acre, 4.8 kg of phosphorus pentoxide, and 6.5 kg of potassium oxide. The formula for single fertilization is: The quantity that should be fertilized = the effective content of the recommended fertilizer. Through this formula calculation, the following results can be drawn:
1. The amount of potassium sulfate applied (potassium sulfate is generally 50% of potassium oxide) is: 6.550% = 13 kg. If it is potassium chloride (potassium chloride is generally 60% potassium), the amount applied is: 6.560% = 10.8 kilograms.
2. The amount of diammonium phosphate (diammonium phosphate typically containing 18% nitrogen and phosphorus pentoxide 46%) is: 4.846%=10.4 kg.
3. The amount of urea (urea nitrogen content is generally 46%) should take into account that part of the nitrogen fertilizer used in the application of diammonium phosphate, it provides pure nitrogen is 10.418% = 1.87 kg. Therefore, the amount of urea should also be applied: (8.5-1.87) 46% = 14.4 kg.
If the compound fertilizer is applied, the amount should be calculated based on the element with the least amount of fertilizer recommended on the formula fertilization table, and then the fertilizer of the other two elements should be added. For example, the content of nitrogen, phosphorus, and potassium in a certain compound fertilizer packaging bag is 15:15:15, then the amount of this compound fertilizer used in the plot is: 4.815%=32 kg. . In this way, the phosphorus element applied to the soil already meets the crop demand. Since the proportion of compound fertilizers is fixed, it is often difficult to satisfy different soil nutrient requirements for different crops at the same time. Therefore, it is necessary to add unit fertilizers to supplement, and the formula is: (Recommended fertilizer amount - already applied amount) Effective content of fertilizer to be applied to unit fertilizer = Supplemental fertilizer amount.
Or take the plot as an example. The plot has already applied 32 kg of compound (combined) fertilizer with N, P, and K contents of 15%. The equivalent of pure nitrogen applied to the soil is: 3215% = 4.8 kg. Phosphorus pentoxide and potassium oxide are also 4.8 kg each. According to the recommended fertilization amount in the recommended fertilization table, 8.5 kg of pure nitrogen and 6.5 kg of potassium oxide are required. Additional application is required: urea (8.5-4.8) 46% = 8 kg, and potassium sulfate (6.5-4.8) 50% = 3.4 kg. If it is potassium chloride, it is (6.5-4.8) 60% = 2.83 kg.
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