how to calculate fertilizer application rates soil test

Best answer


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.

People also ask


  • 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.

    Leave a Reply

    Your email address will not be published.

    Related Posts