While most home gardeners are not growing an acre of garlic, these numbers can be translated into kg/m 2 (lbs/sqft) by “kg/acre of fertilizer / 4047m 2“. For example Garlic’s recommended rates are 55kg(120lbs) nitrogen, 73kg(160) phosphorous, 68kg(150lbs) potassium and 14kg(30lbs) sulphur per acre. Typically crops will have a recommended fertility rate. This can be the opposite when soil nutrients test deficient but are actually abundant and tied up in the soil organic matter that takes time to release into a plant-available form. Even though some tests may show you are sufficient in a nutrient, other soil conditions such as pH may make the nutrients unavailable to your plants. Calculating Your NeedsĮach soil is different and it is best to do a soil test analysis to understand what nutrition is available in the soil.
In this example we see for each bag contains 1.28kg of nutrients 0.32kg N, 0.24kg P, 0.72kg K. You can do the same for phosphate and potash by multiplying by their percentages. To calculate the nitrogen in an 8kg bag of 4-3-9 fertilizer (Orgunique General Purpose granular), multiply 8kg by 4% (0.04) which equals 0.32kg (320g).
#LIQUID FERTILIZERS FOR VEGETABLES CODE#
These three numbers represent the primary nutrients (nitrogen(N) – phosphorus(P) – potassium(K))ġ0-10-10 = 10% nitrogen, 10% phosphate and 10% potashĪdditional numbers with abbreviations are sometimes used at the end of the 3 digit code to represent other significant nutrients such as sulphur and calcium. The first number is the amount of nitrogen (N), the second number is the amount of phosphate (P 2O 5) and the third number is the amount of potash (K 2O). All fertilizer labels have three numbers.
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