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How to Calculate Fertilizer Application RatesRates can also be calculated for bloom- and fruit-producing nutrients like potassium and phosphorus.Calculate the size, in square feet, of the area to be fertilized.Divide the recommended amount of a given nutrient by the percentage of the nutrient in your fertilizer.Calculate the amount of fertilizer needed for the precise amount of space you have by dividing the size of your garden by the size given in the fertilizer.See More….
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How to calculate soil fertilizer rates?
Soil Fertility Guide Calculating Fertilizer Rates from Nutrient Recommendations Soil test recommendations are given in lb/ac or kg/ha of nutrients. To determine the fertilizer rate for a particular nutrient, multiply the rate of the desired nutrient by 100 and divide by the percentage of the nutrient in the fertilizer.
How to calculate the phosphorus application rate?
Calculating the phosphorus application rate: For liquid fertilizers, the weight of the fertilizer must be accounted for, because the fertilizer nutrient content is given as percentage by weight. For example, Urea Ammonium Nitrate (UAN), a liquid fertilizer with a grade of 30-0-0 contains 30% nitrogen by weight.
How do you calculate nitrogen and phosphorus in fertilizer?
N = 80 x 12 / 100 = 9.6 kg per 5 hectares or 9.6/5 = 1.92 kg/ha nitrogen Calculating the phosphorus application rate: For liquid fertilizers, the weight of the fertilizer must be accounted for, because the fertilizer nutrient content is given as percentage by weight.
What is the best fertilizer ratio for your lawn?
Thus, the fertilizer ratio that best fits this recommendation is 3-1-1. You can also determine fertilizer ratios from fertilizer grades by dividing the percentage of nitrogen, phosphate, and potash by the lowest percentage of the three nutrients. Determine ratios for the following fertilizer grades: 21-7-7. 22-6-8, and 18-5-9.