General formula: Desired pounds = × (sq ft to be fertilized)ġ acre = 43,560 sq ft, 1 pound = 16 ounces or 454 gĭetermine the amount of ammonium sulfate needed by a 1,000 sq ft lawn if the soil test fertilizer recommendation suggests 50 pounds of nitrogen per acre. Conversion from Pounds Per Acre to Pounds Per 100 or 1,000 sq ft You can also calculate exactly what you need for your specific space with a little practice. Several universities provide online tools to help with calculating fertilizer application rates links are listed at the end of this document. Tables 1 through 6 can help estimate how much material is needed for those managing small areas. See NMSU Extension Guide A-146, Appropriate Analyses for New Mexico Soils ( /_a/A146/ ), for appropriate analyses and a list of soil testing labs to consider for evaluating New Mexico soils. Other labs may provide recommendations in pounds of fertilizer per acre. Soil test interpretations may report fertilizer application rates on a per-acre basis, pounds per 1,000 square feet (sq ft), or the pounds needed for the size of the garden or lawn specified on the form submitted with the sample. The chloride or sulfate helps carry the nutrient of interest, in this case potassium (K). For example, K 2O is often present as potassium chloride (KCl) or potassium sulfate (K 2SO 4). The rest of the weight, all 72 pounds worth, is a carrier of the N, P 2O 5, or K 2O. For example, if a container or package reads “16-4-8,” this means that for every hundred pounds of this fertilizer there would be 16 pounds of nitrogen, 4 pounds of P 2O 5, and 8 pounds of K 2O. Fertilizer packaging is required by law to state clearly the percentage nitrogen (N), phosphorus (P 2O 5), and potash (K 2O) by weight. Plants vary in their nutrient requirements, and soils can contain different amounts of plant-available nutrients based on their history. Timing fertilizer applications will be important once a recommended fertilizer rate is determined from the soil test. Prescription fertilizer recommendations can be made for your specific conditions if your soil is tested. Soil testing can tell you what to do before fertilizing in order to have a successful garden (such as salinity control or managing sodium). Successful gardening begins with soil testing in order to get the most out of your dollar for fertilizer. However, fertilizing will not correct problems with pH, salinity, or sodium in soils. (Print Friendly PDF)įertilizers can promote vigorous growth of plants and good production.
Respectively, Associate Professor/Extension Agronomist and Professor/Extension Turfgrass Specialist, Department of Extension Plant Sciences, New Mexico State University. Revised by Robert Flynn and Bernd LeinauerĬollege of Agricultural, Consumer and Environmental Sciences, New Mexico State University Determining Amounts of Fertilizer for Small Areas
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