Agriculture Reference
In-Depth Information
Writing the Soil Rx
Time to put it all together: We have calculated what to add to this soil to bring it into
line with the Ideal Soil; now we need to decide which amendments will do the job
for the least amount of effort and expense.
There is no truly simple method of deciding what source to use for many of these
minerals. The amendments shown in the TypicalAnalysis chart on the next page,
all of which are allowed under the USDANOP (National Organic Program), are
mostly mixtures. One needs to look at various combinations and possibilities while
keeping availability and cost in mind. What is locally available at a fair price should
be used whenever possible.
Here are our worksheet calculations from chapters 3-6 converted from ppm to
kg/ha or lbs/acre.
The hash mark # indicates either lbs/acre or kg/ha.
Mineral
Amount
Needed PPM
Kg/Ha or
Lbs/Acre
Calcium
300
600#
Magnesium
48
96#
Potassium
89
178#
Sodium
13
26#
Phosphorus
78
156#
Sulfur
69
138#
Boron
1.34
2.68#
Iron
39
78#
Manganese
34
68#
Copper
7.13
14.28#
Zinc
0
0
On the next page is a table showing the typical mineral content of common soil
mineral amendments allowed under the USDANOP (National Organic Program)
rules,
Subpart G—Administrative
The National List of Allowed and Prohibited Substances § 205.600--601
