Potato Plant Nutrition For Growers
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Copper

Copper 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 0.22 0.21 0.18 0.18 0.18 0.18
30 0.01 0.08 0.27 0.25 0.21 0.21 0.21 0.21
35 0.01 0.09 0.31 0.30 0.25 0.25 0.25 0.25
40 0.02 0.11 0.35 0.34 0.29 0.28 0.28 0.28

Copper availability is strongly affected by both calcareous soils (solubility) and high nitrogen usage. Copper is easily “chelated” by amino acids.

High nitrogen is related to high amounts of free amino acids (especially when plants are low in K). These amino acids retard the translocation of Cu to new growth. Therefore, Cu should be applied in small amounts throughout the major development of the canopy.

Cu doesn’t play a direct role in the chlorophyll development (the green of plants), but leaves low in copper utilize up to 50% less CO2 (the main ingredient for sugar) than sufficient leaves. Excess copper may suppress uptake of Zn, but is thought to stimulate the uptake of Mn. Ratio of Zn : Mn : Cu in potato vines is 3.8 : 5.6 : 1. Ratio of N : Cu in vines is 4,600 : 1.

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