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The present study compared the sensitivity of tissue nitrogen (N) concentration, SPAD readings, Dualex readings, and SPAD/Dualex ratios for assessing the N status of corn (Zea mays L. cv. Pioneer 38B84) under different water supply conditions. A greenhouse trial was conducted with 4 rates of N fertilizer (0, 50, 50+75, and 200 kg ha −1 ) and 3 watering levels (drought, drought followed by...
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