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. 2019 Oct 30;10:1379. doi: 10.3389/fpls.2019.01379

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Copyright © 2019 Keren-Keiserman, Baghel, Fogelman, Faingold, Zig, Yermiyahu and Ginzberg

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Ca, Mg, and K concentrations in the peel of maturing Rosanna tubers following polyhalite fertilization (experiment 1). (A, C, E) Potato plants were fertilized with polyhalite preplanting (PolyH); control plants (C) were not fertilized. Tuber peel was collected at 100, 118, and at harvest, 135 DATP. Haulm desiccation was applied at 120 DATP; hence, the skin-set process occurred between that time and 135 DATP. (B, D, F) Late application of polyhalite, 2 days after haulm desiccation, to both PolyH plants (PolyH+PolyH") and their controls (C+PolyH"). Peel samples were collected at 135 DATP together with the PolyH and C samples. Bar charts compare mineral elements concentrations in mature peel at 135 DATP following polyhalite application at time of planting and polyhalite application following haulm desiccation. Mineral elements concentrations are given as percentage of peel dry weight. (A, B) refer to Ca, (C, D) to Mg, and (E, F) to K concentration. Values are averages of six replicates with SE. Two-factor analysis—time and treatment—was performed with data of charts (A, C), and (E). No interaction was found. Different letters indicate significant difference by Student’s t-test (P < 0.05) between time points, with no difference between treatments. Data of charts (B, D), and (F) were analyzed for statistical significance as one variable (treatment) by Student’s t-test; different letters indicate significantly different values (P < 0.05).