Agriculture Reference
In-Depth Information
don't end up with “hot spots” in your garden that won't grow
anything.
I have received a number of emails asking where to get these
substances, so I am going to give you some sources with the
understanding that none of these companies has paid me, that
I don't know anyone who works for them personally, and that
my listing of them as a source doesn't mean I endorse or even
know everything about their political positions, business
practices or anything else.
Epsom salt (magnesium sulfate) and borax (sodium
tetraborate) are available at any grocery store. Copper sulfate
is a common agricultural chemical and should be available at
any comprehensive “feed and seed” or agricultural store, as
should flowers of sulfur. Iron sulfate is also a common
chemical and if you can't find it at your local feed and seed
store, you can find it ubiquitously on the Internet via a search
for it. I got mine at Kmart, a national department store chain.
Manganese sulfate is also an agricultural chemical, but harder
to find via local sources. I ordered mine from Star Nursery
( www.starnursery.com ) because they sold five pound bags,
but there are a lot of other sources. Sodium molybdate is
pretty expensive, at over $20 for eight ounces at
www.customhydronutrients.com . This is a much better deal
than the reagent grade material from a chemical company
which will run you $200 to $300 for a similar quantity.
pH
pH is a measure of how acidic or alkaline the soil is. It is
important because plants generally have a certain range of pH
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