Sulfate of Ammonia?

    Is this basically the same fertilizer that people use on their lawns, or in addition to regular fertilizer? Is this the product that people use to keep their lawn green every 2-3 months? Or does regular lawn fertilizer do the job?
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Do you mean ammonium sulfate, (NH4)2SO4? If so, ammonium sulfate is 21% nitrogen, but the sulfur in it really acidifies the soil. It can be a component of a blended fertilizer, but can be purchased separately if you really want it.
If you have fescue, bluegrass or ryegrass for a lawn I don't think you want to be applying this stuff every 2-3 months. You could apply 2 to 4 pounds of ammonium sulfate per 1,000 square feet in April or early May, and then 12 pounds per 1,000 square feet in October or November.
If you have bermudagrass, yes, you can apply about 2 to 4 pounds every month from April to early August. If you have St. Augustine, don't apply more than 6 pounds of ammonium sulfate in an entire year or you will get St. Augustine Decline (that's a disease). If you have zoysia, forget it because zoysia doens't need much care anyway.
Your friend, Betty
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Ablang wrote:

Ammonium sulfate is acidic and used primarily where the soils are alkaline (e.g., in my own garden).
It will give a lawn a quick green-up but can burn the lawn if not applied carefully. If the grass blades are not dry or if the ammonium sulfate is not immediately rinsed into the soil, you can kill the foliage. Also, if too much is applied, you can kill the roots.
I use it primarily on shrubs and perennials. My roses and gardenia love it. For my lawn, I use an off-brand or generic lawn food, which dissolves more slowly and is less likely to burn.
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David E. Ross
Climate: California Mediterranean
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