Potato Plant Nutrition For Growers
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Zinc 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 0.01 0.07 0.09 0.19 0.13 0.06 0.05 0.06
30 0.02 0.08 0.10 0.23 0.16 0.07 0.06 0.07
35 0.02 0.10 0.12 0.27 0.18 0.09 0.07 0.08
40 0.02 0.11 0.14 0.31 0.21 0.10 0.08 0.09

Zinc is different from other micronutrients in 2 ways; it is taken up latter in the growth phase and 50%+ of the vines zinc is translocated to the tubers.

An enzyme (aldolase) requires Zn to function. In most plants, this enzyme regulates the transfer of carbohydrates from the chloroplast into the cell body. The effect of Zn on this enzyme is so specific, that the activity of this enzyme has been proposed as an indicator of the Zn nutritional status of plants. This suppression of carbohydrate translocation is evident long before visual deficiencies of zinc (small leaves) occur. Potatoes are quite simply an accumulation of starch; starch comes from sugar (carbohydrate) produced in the chloroplast, moved into the cytoplasm by Zn, which slows down before Zn is visually deficient. (The little things you don’t see are what hurt you the most!)

It is known that high soil P suppresses Zn uptake and translocation. Ratio in potato vines of P:Zn is about 150:1.

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