To calculate the nitrogen in a specific fertilizer, divide by the first number on the label. For example, to calculate the nitrogen in a fertilizer, divide by The resulting number, 10, is the pounds of fertilizer you need to add 1 pound of nitrogen to a 1,square-foot area. Divide the number in half for a square-foot area. Starter fertilizer formulas suited for seeding lawns include , and By calculating the percentage of nitrogen in each formula, you can determine how much fertilizer to apply.
For example, you need 10 pounds of fertilizer for a square-foot area. For fertilizer higher in nitrogen, like the formula, use 5 pounds of fertilizer. Apply fertilizer at a rate of 3 pounds for every square feet of new seed area. There are different types of nitrogen used for synthetic fertilizers. To get your lawn off to a good start, look for an ammonium sulfate fertilizer. Fertilizers that contain ammonium sulfate as the source of nitrogen gradually acidify the soil.
This creates an inhospitable environment for common lawn weeds without harming the grass during seedling development or growth. Use dry granule fertilizer. Pour the fertilizer into a drop spreader or a broadcast rotary spreader and apply it evenly over soil. Mix the fertilizer into the top 4 inches of the soil. If high percentage nitrogen fertilizers are used, then less actual fertilizer product is needed to supply that one pound compared to fertilizers with low percent nitrogen.
Recommended ratios of N-P-K for lawn fertilizers include or Another important factor in choosing nitrogen fertilizers is what kind of nitrogen is actually in the product. Nitrogen fertilizer may consist of fast-release or controlled-release nitrogen. Advantages and disadvantages are outlined in the table below.
For lawns, fertilizers containing controlled-release nitrogen sources are suggested for most applications. Check the guaranteed analysis information on the fertilizer label for information on what forms of nitrogen are in the product. Water insoluble nitrogren in slow-release. In addition, a variety of special lawn fertilizers may be found. Winterizer fertilizers are typically high in potassium, and although advertised for fall application can be applied in spring as well.
Potassium is used all year by grasses, and is involved in heat and cold tolerance, disease resistance, and other stress tolerances.
Weed and feed products contain a broadleaf weed killer for weeds such as dandelions fall application ; others contain a preemergence herbicide to control crabgrass spring application. Lawn starter products, typically high in phosphorus, are intended for newly seeded lawns and freshly laid sod. Sources of organic forms of Nitrogen by their very nature are in a non-burning form and are released to the turf plant over time to varying degrees bases on soil temperature and moisture levels.
There are a variety of organic sources of nitrogen, phosphorus and potassium available to the homeowner. Spread out the sheet of plastic on a flat surface outdoors, perhaps your driveway. Use the tape measure to measure the length and width of the plastic surface.
Determine the square footage of this surface by multiplying the length times the width. Many fertilizer bags will indicate what setting to use for a particular brand of spreader. Use this as the starting setting. If unknown, select a setting near the middle of its range. Weigh the empty container. Example: 2oz. Begin applying the fertilizer over the plastic sheet walking at your normal rate.
When the entire area of the plastic has been covered, stop, carefully gather all the fertilizer from the sheet and place it in the empty container. Weigh this container. Record the weight and subtract the tare weight the empty container from this figure. The net result is the amount of fertilizer applied to that square footage. Is the amount of fertilizer collected the correct amount for this size area? If not, change the setting and redo the steps. In our example, the pound bag of fertilizer we selected has an analysis of The chart above indicates that this bag will cover approximately 10, square feet at the desired nitrogen rate.
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