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Home Garden Fertilization, Organic Sources
Home Garden Fertilization, Inorganic Sources

Guidelines

Because smaller areas are generally involved around the home landscape and garden, this section provides recommended amounts of nitrogen, phosphorus, and potassium based on the more commonly formulated fertilizers available in garden supply stores and nurseries.  Because the formulations are not likely to match exactly the recommendations for primary nutrients, the recommendations approximate the amounts that are appropriate based on use of formulated fertilizers.  For growers who prefer to be more precise and use primary fertilizer materials such as ammonium nitrate, superphosphate, and muriate of potash, the per-acre amounts given in the other sections may be converted to a 1,000 square-foot area by dividing the values by 43.6.  For example, 100 pounds per acre is equivalent to 2.3 pounds per 1,000 square feet. 

The following examples illustrate the conversion of per acre rates for nitrogen, phosphate, and potash to rates per 1,000 and 100 square feet using ammonium nitrate, triple super phosphate, and muriate of potash as single-nutrient sources. For example, ammonium nitrate applied at rates of 294 pounds per acre or 6.8 pounds per 1,000 square feet both provides nitrogen application rates of 100 pounds per acre.

Amounts of single-nutrient fertilizers needed to provide 100 pounds per acre of
N, P2O5 or K20 for one acre and smaller areas
 

Fertilizer Material

Nutrient Form

Area

Acre

pounds

1,000 square feet

pounds

100 square feet

cups

ounces

ammonium nitrate (34-0-0)

nitrogen, N

294

6.8

1.4

11

triple superphosphate (0-48-0)

phosphate, P2O5

208

4.8

1.0

7

muriate of potash (0-0-60)

potash, K2O

167

3.8

0.8

6

Amounts of fertilizer are based on bulk densities of approximately 1.0 and the following formulations: ammonium nitrate, 34-0-0; triple superphosphate, 0-48-0; muriate of potash, 0-0-60.  Slight differences in formulation or concentration may be encountered between fertilizers prepared by different manufacturers.

NOTE: The fertilizer formulations given below are only suggestions.  A cost effective choice should be made between the fertilizer formulations given below and any other equivalent grades available in the market.  Consult your local County Extension Agent for information on other blends and equivalent grades for substitutions.

General Comments

68     Broadcast Epsom salts (magnesium sulfate) at the rate of 0.5 lbs per 100 square feet or 5.0 lbs per 1,000 square feet or a fertilizer containing magnesium.  (When lime is not recommended and soil test magnesium is low)

69     Broadcast 5 lbs gypsum (calcium sulfate) per 100 square feet or 50 lbs per 1,000 square feet.  (When lime is not recommended and soil test calcium is less than 400 lbs calcium per acre)

654  Soil test again next year if either phosphorus (P) or potassium (K) is high or excessive to monitor levels.  (When P or K is high or excessive)

655  If either boron (B), manganese (Mn), or zinc (Zn) is low, use a leaf analysis to confirm deficiency.  Contact the Home and Garden Information Center (1-888-656-9988) for more information.  (When B or Mn or Zn is low)