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Fertilizer Conversion Table for Small Area

Jim Jian Wang, Stevens, Jr., J. Cheston

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


Table 1. Conversions for flowerpots or flower boxes

Pounds
Per
Acre

Volumes of Average Fertilizer

Flowerpots (See Footnote)*

Flower Boxes

4- Inch

6- Inch

8- Inch

1 Square Foot

2 Square Feet

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

* Dissolve 1 teaspoon of fertilizer in a pint of water and add amounts of this mixture given in the table for flowerpots

Table 2. Approximate Volumes of Fertilizer for Small Areas

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

* Higher rates given for limestone.

Table 3. Approximate Volumes of Fertilizer for a Given Volume of Soil

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

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

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

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

2/28/2006 3:29:00 AM
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