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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 peels of early- and late-bulking Rosanna tubers following polyhalite fertilization (experiment 3). (A, C, E) Potato plants were fertilized with polyhalite preplanting (PolyH); control plants (C) were not fertilized. Tuber peel was collected at 60, 75, and 95 DATP. (B, D, F) Late in-season application of polyhalite (PolyH") was performed at 85 DATP for both PolyH plants (PolyH+PolyH") and their controls (C+PolyH"). Peel samples were collected at 95 DATP together with the PolyH and C samples. Bar charts compare mineral elements concentrations in tuber peel collected at 95 DATP following polyhalite application at preplanting and polyhalite application in-season. 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 five replicates with SE. Two-factor analysis—time and treatment—was performed with data of charts (A, C), and (E). Interaction was found only for K concentrations. For Ca and Mg, 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).