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. 2020 Nov 17;11:572293. doi: 10.3389/fpls.2020.572293

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Copyright © 2020 Saloner and Bernstein.

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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Visual appearance of the plants (top row), leaves (middle row), and roots (bottom row) under increasing N supply. From left to right: 30, 80, 160, 240, 320 mg L⁻¹ N. Leaf images are of the youngest, fully developed leaf on the main stem, taken 31 days after the initiation of the fertigation treatments.