Estimate Nitrogen Needs for Your Vegetable GardenThis website takes 3 types of data inputs and converts them into an estimate of how much nitrogen-based fertilizer is needed.
Input 1: Nitrogen (lb) per AcreThis calculator asks for the nitrogen needs for a crop planted in an acre because this value can often be found at the website of a county extension office or the land grant university in your state.
Input 2: Length and Width of Your Plot
Input 3: Percentage of Nitrogen in your FertilizerFertilizer purchased in a garden store will have a 3 number code on it. An example would be "12-3-7". This means the contents of the fertilizer package have 12 percent nitrogen, 3 percent phosphorus, and 7 percent potassium (potash). These are the three primary nutrients a plant will need. Enter the first of these numbers in the next field.
Area of plot (sq ft): Nitrogen (oz) per sq. ft.: Nitrogen (oz) per plot: Amount of fertilizer (oz.) needed for your vegetable garden plot: