Agriculture Reference
In-Depth Information
to these in quantity you may be able to meet the soil's iron requirements with them
instead of buying the more expensive purified Iron sulfate.
Manganese Mn
The worksheet says 34ppm or
68# of Manganese
is needed.
Manganese Mn
11 Add
212#
Manganese sulfate 32%Mn
The
Manganese sulfate monohydrate
commonly available is 32% Mn and 19%
S
68# / 0.32 =
212# of MnSO
4
1H
2
O is needed
.
In addition we will be gaining 19% of this weight in Sulfur
212 x 0.19 = 40 kg/ha or lbs/acre of Sulfur. We will have plenty of Sulfur.Alittle
extra won't hurt.
Copper Cu
We need 7ppm or
14#
of Copper
Our Copper sulfate amendment contains 25% Cu
Copper Cu
1.07 Add
56#
Copper sulfate 25%Cu
14 / 0.25 = 56#
We need to add 56# Copper sulfate 25% Cu
Zinc Zn
Our Ideal P=K number is 178ppm. Zn should be 1/10
th
of that, or 17.8ppm. The lab
test found 16.4ppm Zn, close enough.
We do not need to add any Zinc
Our calculations for the soil mineral prescription are finished
. Hearty
congratulations to the reader who has made it this far.
The Final Product: The completed soil prescription
On the next pages you will find the completed soil report and recommendations in
the format used when writing soil prescriptions at SoilMinerals.com.
You will note that the trace mineral sources, beneficial organisms, and humic acid
sources mentioned above have been added as “optional but recommended”.
Instructions for applying the amendments are always a good idea and have been
included.
The format that we use for the soil report and worksheet is a slightly modified form
of the one developed by WmAlbrecht, Louis Bromfield, and their associates in the
1940s. You will find a blank soil report worksheet in the appendix.
