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T. J. Krupnik, J. Six, J. K. Ladha, M. J. Paine and C.van Kessel, “An assessment of fertilizer nitrogen recovery efficiency by grain crops,” In A. R. Mosier et al. Ed., Agriculture and the nitrogen cycle: Assessing the impacts of fertilizer use on food production and the environment. Scientific Committee on Problems of the Environment (SCOPE), Paris, 2004

has been cited by the following article:

• TITLE: Leaf Colour Chart vis-a-vis Nitrogen Management in Different Rice Genotypes

  AUTHORS: Avijit Sen, Vinod Kumar Srivastava, Manoj Kumar Singh, Ram Kumar Singh, Suneel Kumar

  KEYWORDS: Leaf Colour Chart (LCC), Nitrogen, Rice

  JOURNAL NAME: American Journal of Plant Sciences, Vol.2 No.2, June 27, 2011

  ABSTRACT: A field trial comprising 3 rice varieties (NDR-359, Sarju 52, HUBR 2-1) and 4 LCC scores (≤ 2, ≤ 3, ≤ 4, ≤ 5) along with the recommended dose of N was conducted in a split plot design to calibrate the LCC for nitrogen requirement of rice. Maximum grain yields of NDR-359, Sarju 52 at LCC ≤ 5 and HUBR 2-1 at LCC ≤ 4 were found to be 47.10, 40.66 and 36.04 q/ha respectively. The critical LCC score for real time nitrogen requirement for NDR 359 and Sarju 52 was found to be ≤ 5, while for HUBR 2-1 it was ≤ 4. Agronomic and recovery efficiency of nitrogen also followed the same trend. In the functional relationship between SPAD value and LCC score, while it was linear in NDR-359 and Sarju 52, for HUBR 2-1 it was quadratic. Further a positive correlation between SPAD values and LCC score was observed in all the 3 varieties.