Potato Plant Nutrition For Growers
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Iron

Iron 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 0.02 0.09 0.22 0.25 0.25 0.25 0.25 0.26
30 0.02 0.11 0.27 0.29 0.31 0.31 0.31 0.31
35 0.02 0.13 0.31 0.34 0.36 0.36 0.36 0.36
40 0.02 0.15 0.36 0.39 0.41 0.41 0.41 0.42

80% of the iron is found in chloroplasts, directly involved in photosynthesis. To place it in comparison to Mg, there are 17-18 atoms of Fe, to 5 atoms of Mn to 4 atoms of Mg to 1 atom Zn to 1 atom Cu directly involved in the photosynthesis “production line”.

Problem: Tissue testing Fe levels is not an accurate method of testing for biologically active iron. On the contrary, accumulating levels of Fe are usually (especially in calcareous soils) an indication of poor Fe activity.

Solution: Water run Fe with other minerals such as Zn, Mn & Cu during the optimum period of uptake; 20 to 45 dae. Iron is required by potatoes at much higher levels than Zn, Mn or Cu. Ratio in vines is 73 Fe : 3.8 Zn : 5.6 Mn : 1 Cu. Iron could be classified as a “secondary nutrient”.

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