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I thought about making a box with a Cover over it so it won't get as wet but I would mix it with Dirt in the box.
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Unless you mix grain or something that will spoil, the salt and minerals are better off not just on the ground but mixed in with the soil.
Here's a link to some pics and discussion on this subject:
Mineral Mix
I can't say that I know why but they seem to eat it better if it's soaked into the soil.
We always used protective mineral feeders for our cattle when feeding loose mineral but I never had any luck with deer eating it that way
They really don't like eating the mineral anyway...it's the salt they are after.
The cattle were the same way...had to mix it with a molasses mix to get them to eat it.
Pretty tough to say how much if any it actually helps antler growth but I figure it's cheap enough...it can't hurt.
I always keep in mind that this state was producing some huge bucks long before anyone ever dreamed of giving them minerals and choice food plots
Here's what I use:
Trace Mineral
Sheep Mineral
The trace mineral is 90% min. salt and the sheep mineral has 15% salt as well as vitamins.
50# of TM is $6.50 and 50# of sheep mineral is $16 and some change.
You can buy some variation of this at most any feed store or TSC.