Tons to Teaspoons - How to Convert Rates of Fertilizer Per Acre to Amounts for Small Areas
Use the tables below to determine the amounts of various fertilizers to be used for different volumes of soil, single potted plants, single rows and small areas. The conversions in the tables are not exact, but they are accurate enough to guide you. It should be pointed out that the rates given in these tables are not intended as recommendations but are given as conversion guides. For actual fertilizer recommendations, consult your local county agent or report of your soil test results.
In general, the volume of fertilizer to be applied varies with different materials because of weight differences. For example, granular sodium nitrate weighs approximately 23 ounces per pint, whereas granular ammonium nitrate weighs approximately 13 ounces per pint.
Some equivalents that may be helpful are:
1 acre is equal to 43,560 square feet
1 pint of water weighs 1 pound
1 pint equals 2 cups, 32 tablespoons, 96 teaspoons
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Table 1. Conversions for flowerpots or flower boxes |
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Pounds
Per
Acre |
Volumes of Average Fertilizer |
|
Flowerpots (See Footnote)* |
Flower Boxes |
|
4- Inch |
6- Inch |
8- Inch |
1 Square Foot |
2 Square Feet |
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|
|
|
|
Teaspoons |
Tablespoons |
Tablespoons |
Teaspoons |
Teaspoons |
|
250 |
2 ½* |
1 ½* |
5* |
½ |
1 |
|
500 |
5* |
3* |
10* |
1 |
2 |
|
750 |
7 ½* |
5* |
15* (1 cup) |
1 ½ |
3 |
|
1000 |
10* |
7* |
20*
(1 1/4 cup) |
2 |
4 |
|
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* Dissolve 1 teaspoon of fertilizer in a pint of water and add amounts of this mixture given in the table for flowerpots
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Table 2. Approximate Volumes of Fertilizer for Small Areas |
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Materials Grouped According to Approximate Weight Per Pint |
Rate Per Acre
Pounds |
Use These Weights Per Specified Area |
Use These Measures Per Specified Area |
Use These Volumes Per 3' Rows |
|
100 Sq. Ft.
Pounds |
1000 Sq. Ft.
Pounds |
10 Sq. Ft.
Tbsps
|
100 Sq. Ft.
Cups |
10 Ft.
Cups |
100 Ft.
Pints |
|
Sulfur, Flowers of Cottonseed Meal (10oz./pt.) |
100
300
500
1000 |
.2
.7
1.2
2.3
|
2.3
6.9
11.5
23.0 |
1.2
3.6
6.0
12.0 |
3/4
2
4
7 1/2 |
.2
.6
1.1
2.2 |
1
3
5 1/2
11 |
|
Ammonium Nitrate Urea (13 oz./pt.) |
100
300
500
1000
|
.2
.7
1.2
2.3 |
2.3
6.9
11.5
23.0 |
.9
2.7
4.5
9 |
1/2
1 3/4
3
5 1/2 |
.2
.5
.8
1.6 |
7/8
2 1/2
4
8 |
|
Ammonium phosphate Mixed Fertilizer Potassium chloride
(16 oz./pt.) |
100
300
500
1000 |
.2
.7
1.2
2.3
|
2.3
6.9
11.5
23.0 |
.7
2.1
3.5
7 |
1/3
1 1/2
2 1/4
4 1/2 |
.1
.3
.7
1.4 |
1/2
1 1/2
3 1/2
7 1/2 |
|
Ammonium Sulfate Superphosphate
(19oz./pt.) |
100
300
500
1000 |
.2
.7
1.2
2.3 |
2.3
6.9
11.5
23.0
|
.6
1.8
3
6 |
1/2
2
4
8 |
.1
.3
.6
1.2 |
1/2
1 1/4
3
6 |
|
Nitrate of Soda Ground Limestone
(23oz./pt.) |
100
300
500
1000
2000* |
.2
.7
1.2
2.3
4.6 |
2.3
6.9
11.5
23.0
46.0
|
.5
1.5
2.5
5
10 |
1/3
1
1 1/2
3
6 1/2 |
.1
.3
.5
1
2 |
1/2
1 1/8
2 1/2
5
10 |
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* Higher rates given for limestone.
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Table 3. Approximate Volumes of Fertilizer for a Given Volume of Soil |
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Fertilizer Materials |
Rate Per Acre
Lbs. |
Volumes of Fertilizer for These Volumes of Soil |
|
Per Cubic Yard |
Per Cubic Foot or
7 1/2 gal. |
5 gallons |
1 gallon |
|
Tablespoons |
Cups |
Teaspoons |
Tablespoons |
Teaspoons |
Teaspoons |
|
Mixed Fertilizers or Potassium chloride or Ammonium phosphate |
100
300
500
1000 |
4
12
20
40 |
1/4
3/4
1 1/4
2 1/2 |
1/2
1 1/3
2 1/4
4 1/2
|
3/4
1 1/2
|
1/3
1
1 2/3
3 1/4 |
1/3
3/5
|
|
Ammonium Nitrate or Urea |
100
300
500
1000
|
5
15
25
50 |
1/3
1
1 1/2
3 1/8 |
2/3
1 1/2
2 3/4
5 1/2
|
1/2
7/8
1 3/4
|
1/2
13/4
2
4 |
2/5
4/5
|
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Ammonium Sulfate or Superphosphate |
100
300
500
1000 |
3 1/3
10
16 3/4
33 2/3 |
1/5
5/8
1
2 |
2/5
1 1/5
2
3 3/4
|
2/3
1 1/4
|
1/4
3/4
1 1/4
2 3/4 |
1/5
1/2
|
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Nitrate of Soda or Ground LImestone |
100
300
500
1000 2000 |
2 3/4
8 1/2
14
28
56 |
1/2
7/8
1 3/4
3 1/2
|
1/3
1
1 1/2
3
6
|
1/3
1/2
1
2
|
1/5
3/4
1 1/5
2 1/5
4 1/2 |
1/4
1/2
1
|
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Sulfur or Cottonseed Meal |
100
300
500
1000 |
6 1/2
19
32
64 |
1/3
1 1/4
2
4 |
4/5
2
3 2/3
7 1/3
|
2/3
1 1/4
2 1/3
|
1/2
1 1/2
2 2/3
5 1/5 |
1/2
1
|
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