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Essex, UK

Had my soil tests back (posted in diary). I'm low on manganese and have decided to do something about it this year. Anyone used manganese sulphate before? New to me and not sure whether it's best to foliar feed through the season, liquid feed through irrigation lines, or amend the patch with granular now? What is the normal application rate for it?

4/13/2018 1:12:43 PM

Germany

I´ve had soil tests with manganese 7 ppm and they were interpreted as "medium Mn content". Your manganese is much higher, and I cannot believe that you should be aiming at manganese contents which equal the magnesium content. You better double-check with the lab if there might be an error in their soil test interpreting software (the test result of more than 30 ppm Mn could be correct, but the interpretation as "very low" is something I would doubt).

4/13/2018 2:25:26 PM

Essex, UK

I think the guideline level is probably adjusted up due to my high soil pH, but that's unlikely to change quickly so will still have to feed for manganese.

4/13/2018 3:36:18 PM

Germany

Then you better do some foliar feeding of trace minerals (incl. manganese), because the effect of adding MnSO4 to your high pH soil won´t last very long.

4/13/2018 4:02:26 PM

Wisconsin

Like pumpking said if you have a high ph soil, the stuff will just run straight through. I put like 10 lbs down and by the end of the season I was lower than when I started. This year im planing on amending the planting area and supplementing through watering.

4/14/2018 2:10:37 AM

Warwood

Shoot for 6.8 pH but up to 7 should produce as pH could come down somewhat but don't dump too much. Consider is your soil clay, loam, sandy etc. Average of 1 1/2-3 lbs. per 1000 sq.ft. is usually recommended. 3 lbs. would be for sandy soil, less for clay-loam etc. Manganese sulphate is most needed and used by the plant mostly from vine starting to run to 7-8 ft. vine. It competes a bit with iron so check your iron level as well. I would amend the patch soil with it and wouldn't worry too much about foiliar unless you do soil tissue tests and find your plant isn't getting enough Mn. Changes to macro and micro nutrients take time meaning months and sometimes years to get to where you know your soil and keep getting soil tests as you have. Hope this helps.

4/14/2018 7:46:26 PM