Assessment of the nitrogen management strategy using an optical sensor for irrigated wheat

By Bijay-Singh, R. Sharma, Jaspreetkaur, M. L. Jat, K. Martin, Yadvinder-Singh, Varinderpal-Singh, P. Chandna, O. P. Choudhary, Rajeev Gupta and 9 more. Agronomy for Sustainable Development, 2011

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Topdressing nitrogen recommendation for early rice with an active sensor in south China (2014, methodology): “Therefore, the NDVI was often normalized with a N-rich reference, and sufficient index or response index was calculated to enhance the N diagnosis recommendations (Broge and Leblanc 2000; Schmidt et al. 2011; Singh et al. 2011; Clay et al. 2012).”
Establishment of threshold leaf colour greenness for need-based fertilizer nitrogen management in irrigated wheat (Triticum aestivum L.) using leaf colour chart (2012, background): “Nitrogen uptake of irrigated wheat proceeds very slowly until tillering begins, and N flux (kg N ha−1 day−1) increases to a maximum around Feekes 6 stage (Doerge et al., 1991) which coincides with maximum tillering stage at 2nd irrigation (Bijay-Singh et al., 2011).”