# Fertilizer Conversions

 Fertilizer Group pounds per cup pounds per 2 liter Organic meals, blends and wood ash 1 cup = 1/3 lb 2 liter = 3 lbs Ground Rock Dusts (Limestone, Rock Phosphate, Greensand) 1 cup = 3/4 lb 2 liters =6 lbs Coarse & Medium Granulated Synthetic Blends (ex. 5-10-10 garden fertilizer) 1 cup = 1/2 lb 2 liters=4.5 lbs Fine Granulated & Flaked Synthetic Blends (ex many turf fertilizers) 1 cup = 1/3 lb 2 liters=3 lbs Composts 1 cup = 1/6 lb 2 liters =1.5 lbs Powdered Sulfur 1 cup = 1/2 lb 2 liters = 4.5 lb Urea and other High Nitrogen Fertilizers 1 cup = 1/3 lb 2 liters = 3.5 lbs

##### Common measurements

12 oz coffee can = 1 liter

cut off top of 2 liter soda bottle = 2 liters

cut off top of 1/2 gallon milk bottle = 1/2 gallon

##### Common household containers to use for measuring

1 lb = 16 ounce

4 quarts = 1 gallon

4 cups = 1 quart

1 pint= 2 cups

1 acre = 43,560 square feet

12 inches= 1 foot

##### How do I figure out how many square feet my garden or lawn is?

Length in feet X width in feet = square feet
5 feet x 20 feet = 100 square feet.

##### What if my garden is not square?

Estimate the length and the width. As this approach overestimates the square footage, apply a little less of the recommended amount of fertilizer so as not to over fertilize.

##### My garden is only 100 square feet and your recommendation is for 50 pounds per 1000 sq feet of limestone. How do I figure how much limestone to use?

100 is 1/10 th of 1000, so you will need 1/10 th the amount of limestone or 50 divided by 10 which equals 5 lbs of limestone.

How do I know how much 5 lbs of limestone is? (See above for lists of conversions)

1 cup of limestone weighs about ¾ lb (.75 lbs).
0 .75 lbs goes in to 5 about 6.6 times. 6.6 times 1 cup equals 6.6 cups
So 5 lbs of limestone would be a little over 6 ½ cups.

##### How much fertilizer should I use if the recommendation is for 20 pounds of 10-10-10 per 1000 sq feet and I have 100 sq feet?

100 is 1/10th of 1000 so…
1/10 of 20 lbs equals 2 lbs. So I need 2lbs of fertilizer per 100 sq feet.

1 cup of garden fertilizer weighs about ½ pound. So for 2 lbs you would need 4 cups of 10-10-10 fertilizer

By Dawn Pettinelli, Associate Extension Educator, PSLA

### Questions? Contact:

UConn Soil Nutrient Analysis Laboratory
Department of Plant Science and Landscape Architecture

Phone: 860.486.4274
Email: soiltest@uconn.edu
Website: soiltesting.cahnr.uconn.edu

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