Choosing Fertilizers for Home Lawns
Fertilizing is an important lawn care practice, as it influences
grass color, ability to recover from stress, and helps prevent weed
invasions and disease. There are important features to consider when
choosing lawn fertilizers at the local garden center.
Nitrogen (N), phosphorus (P), and potassium (K) are the three major
nutrients needed by lawns. Nitrogen is the nutrient required most,
although too much nitrogen can cause excessive top growth, leading to
assorted problems. Percent nitrogen (by weight) is always the first of
three numbers on the fertilizer bag, followed by phosphorus and
potassium. For example, a 18-6-12 fertilizer contains 18 percent
nitrogen. This number is important because it determines how much
fertilizer is needed. In most cases, a rate of 1 pound of nitrogen per
1,000 square feet is suggested for each fertilizer application to the
lawn. 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 3:1:2 or 4:1:2.
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 nitrogen in slow-release.
12-4-8 Slow Release fertilizer is always best
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