Ammonium Sulfate -- A soluble salt which is an excellent source of Nitrogen. Use with care as it may promote an excess of green growth and make your plants weak, spindly and susceptible to disease.
A compound of ammonium sulfate, often used as an herbicide.
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Apply an acidifying fertilizer such as ammonium sulfate, around the drip line of the bush. Apply half of the fertilizer at bloom time and the second half one month later.
Blueberries are shallow rooted plants.
Look for fertilizer containing ammonium nitrate, ammonium sulfate, or sulfur-coated urea. Both ammonium sulfate and sulfur-coated urea are good choices for making soil acidic, especially with azaleas.
Amend alkaline soil with ammonium sulfate, available at garden centres, or with slowly acidifying materials such as peat moss, pine needles, aged manure or woodland litter.
Man-made ammonium nitrate, ammonium sulfate and urea are examples of such quick-release forms of nitrogen. These provide a rapid green-up but have drawbacks.
Spinach is a heavy feeder, so add ΒΌ cup of ammonium sulfate (spinach has a high sulfur requirement) per 10 feet of row when plants are 2 inches tall, then again after the first harvest to keep the plants growing vigorously.
You also can apply a light covering of ammonium sulfate (20-0-0) at the rate of a pound per 1,000 square feet of garden area. Spade or rototill all these materials into the soil, mixing well to a depth of 8 to 12 inches.
Raspberries should be fertilized each spring. Apply an all-purpose fertilizer (16-16-8, 10-10-10, or 20-20-20) the first year and ammonium sulfate every year thereafter. Apply one cup of ammonium sulfate (21-0-0) per 10 feet of row.
Ammonium sulfate is usually used as a fertilizer for blueberries, as opposed to the aluminum sulfur used to lower the pH. But you can use any fertilizer for acid loving plants, including blueberry food and azalea food.
Brands vary, but the most effective contain iron (ferrous ammonium sulfate, ferrous sulfate, or ferric sulfate) and potassium salt. Follow directions carefully, as the iron can stain sidewalks and driveways. Recommended ranges are from .5 - 1.
Fertilizers such as ammonium nitrate or ammonium sulfate will tend to lower pH. These are often marketed as fertilizers for acid-loving plants.
urea, ammonium sulfate, and calcium nitrate. Slowly available sources contain water insoluble nitrogen (WIN) from urea formaldehyde (UF), UF based products (methylene ureas), sulfur coated urea, natural organics (bone meal, fish meal, dried blood, ...
The most commonly used inorganic forms of nitrogen in fertilizers are ammonium nitrate and ammonium sulfate.
For woody plants (trees, shrubs, and vines): If you desire more vigorous growth, apply 1/2 pound nitrogen (N) only. This amount of nitrogen can be supplied by applying 2 1/2 pounds ammonium sulfate 21-0-0 or 1 1/2 pounds ammonium nitrate 33-0-0.
In both cases, before making an application, make sure you follow the package instructions. Finally, realize that certain fertilizers, notably synthetic forms that contain ammonium sulfate or ammonium nitrate, can lower pH, ...
Avoid using ammonium sulfate as it may be toxic to earthworms. Keep in mind that chemical fertilizers are not as effective as organic sources because they contain no protein (which microorganisms use).
 See also: Plant, Fertilize, Soil, Water, High
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