Soil organic matter
Soil salinity, EC
Link to UC ANR Healthy Soils
> Fertilizer Calculation
How much Fertilizer for my small garden
Converting fertilizer rates (lbs/acre) for your garden area.
These are estimates only!
1. Enter the recommended N rate (lbs/acre):
2. What is the percent of N in the fertilizer? :
(from 0 up to 46 for Urea)
3. What is the Fertilizer Use Efficiency (the amount of fertilizer making it to the plant) (%)? :
(typically ranges from 40% up to maybe 80 for Nitrogen compounds)
4. What is your garden size in sq ft? :
5. What's the density of your fertilizer (Oz/cup) :
(approx: 2.5 for compost up to 5 or 6 for urea and powdered sulfur to 9.5 for ammonium sulfate)
6. Is there Phosphorus in your fertilizer? Percent? :
(e.g., 0 in urea, 11% in 11:11:11- check the label)
7. Is there Potassium in your fertilizer? Percent? :
(e.g., 0 in urea, 37% in Potassium nitrate - check the label)
Click here to
How many lbs of fertilizer is that for my garden?:
How many ounces of fertilizer is that for my garden?:
What volume of fertilizer is this? (This is really approximate as it depends on product density)?
By the way how much other nutrients were added (lbs/acre)?
The rate of Fertilizer is:
Given the Fertilizer Use Efficiency you entered, the (approx) amount of Fertilizer N reaching the plant is:
lbs/acre (based on the fertilizer use efficiency)
The (approx) amount of fertilizer N gone elsewhere (leached, lost as gas, or in organic matter):
More than likely many gardeners over-fertilize their gardens. You can change SOM, but not texture
Fertilize responsibly, build Soil Organic Matter.
A good way to build soil health.
Created March 2010