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Uchino, H and Watanabe, T and Ramu, Karri and Sahrawat, K L and Marimuthu, S and Wani, S P and Ito, O (2013) Calibrating Chlorophyll Meter (Spad-502) Reading by Specific Leaf Area for Estimating Leaf Nitrogen Concentration in Sweet Sorghum. Journal of Plant Nutrition, 36 (10). pp. 1640-1646. ISSN 0190-4167