Ammonium sulphate is a commonly used fertiliser for lawns. It provides the grass with much-needed nitrogen to help it grow well. Nitrogen is one of the fertilisers that lawns and other plants need. The fertiliser number for ammonium sulphate is 21-0-0. This means it is 21 per cent nitrogen with 0 per cent phosphorus and potassium. Apply ammonium sulphate only when there is a need for nitrogen-only fertilisation.
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Mix about 6 ½ lbs. of ammonium sulphate per 1,000 square feet of lawn with an equal amount of compost.
Sprinkle the mixture over the lawn. Rake over the lawn to work it into the soil under the turf.
Water the lawn well for 10 to 15 minutes following the application of ammonium sulphate to avoid burning the lawn.
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