Potato Plant Nutrition For Growers
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Manganese

Manganese Accumulation in Units/Acre in Relation to Yield

Tons/Ac 15 dae 30 dae 45 dae 60 dae 75 dae 90 dae 105 dae 120 dae
25 0.06 0.38 1.5 1.8 1.9 1.9 1.7 1.6
30 0.08 0.46 1.8 2.2 2.3 2.3 2.1 1.9
35 0.09 0.53 2.1 2.6 2.7 2.7 2.4 2.2
40 0.10 0.61 2.3 2.9 3.0 3.1 2.8 2.5

Manganese is primarily involved in photosynthesis processes. It should be supplied as the canopy develops. Actually, directly involved in the photosynthesis process are 5 atoms of Mn, compared to 4 atoms of Mg. Mn is most deficient in soils contain free carbonates (calcareous soils) and soils irrigated with high bicarbonate water.

Mn is required in relatively low levels. However, due to possible tie up, it is recommended to soil test for Mn availability at 20 to 30 dae. If soil ppm is low, water run & foliar apply Mn. Mn is antagonistic with Fe; an excess of one will suppress uptake and translocation of the other. Plants containing unusually high petiole/tissue levels of iron should be foliar fed with Mn as the canopy develops.

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