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The calculation method for single fertilization is: (the effective content of the recommended fertilizer quantification) 100 = the quantity that should be fertilized. The following results were calculated: Urea application (urea nitrogen content is generally 46%) should be (8.546) 100 = 18.4 kg; applied superphosphate (P2O5 content in superphosphate is generally 12% -18%) Should be (4.812) 100 = 40kg; applied potassium sulfate (K2O content in potassium sulfate is generally 50%) should be (6.550) 100 = 13kg.
The amount of compound fertilizer to be applied is calculated based on the fertilizer with the minimum amount of recommended fertilizer, and then the other two kinds of fertilizers are added. If the content of nitrogen, phosphorus, and potassium marked on a compound fertilizer bag is 15:15:15, then the compound should be applied to the plot: (4.815) 100 = 32 kg. Because the proportion of complex fertilizer nutrients is fixed, it is difficult to meet the needs of different crops for different nutrients in different soils at the same time. Therefore, it is necessary to add simple fertilizer to supplement, and the calculation company is: (recommended fertilizer amount - applied fertilizer amount) to be applied to chemical fertilizer Effective content = increased fertilization amount. This plot applied 32 kg of compound fertilizer with a N, P, and K content of 15%, which is equivalent to 3215 = 4.8 kg of pure nitrogen applied to the soil, and P2O5 and K2O were each 4.8 kg.
According to the requirements of the recommended fertilization amount of pure nitrogen 8.5kg, K2O6.5kg on the table, it is also necessary to increase: urea (8.5-4.8) 46% = 8kg, potassium sulfate (6.5-4.8) 50% = 3.4kg.
How to Calculate Fertilizing Quantity by Soil Testing Formula
How to Calculate the Fertilizer Quantity in Soil Testing Formulas Published: 2004-8-18 Source: Currently, formula fertilization has become a hot spot in agricultural production. In general, the recommended application amount for the formula fertilization test is the amount of pure nitrogen, P205 (phosphorus pentoxide), and K2O (potassium oxide). Due to the different effective content of various fertilizers, it is not easy for farmers to accurately grasp the amount of fertilizer used in the production process. Suppose a piece of land is recommended to use 8.5kg of pure nitrogen per mu, 4.8kg of P2O5 and 6.5kg of K2O.