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Calibrating the Leaf Color Chart for Nitrogen Management in Different Genotypes of Rice and Wheat in a Systems Perspective

^a Y. Singh, Project Directorate for Cropping Syst. Res. (PDCSR), Modipuram, Meerut-250110, India
^b Int. Rice Res. Inst., DAPO Box 7777, Metro Manila, Philippines
^c Rice–Wheat Consortium for IGP, CIMMYT-RWC, CG Block, NASC Complex, DPS Marg Pusa Campus, New Delhi-110012, India
^d Indian Agric. Res. Inst., New Delhi, India
^e Natl. Agric. Technol. Project, Krishi Anusandhan Bhawan-II, New Delhi 110012, India

View larger version (37K): [in a new window]   Fig. 1. Chlorophyll meter reading as influenced by N management—zero-N control, leaf color chart (LCC)-based (no basal N), and fixed-time recommended N split (28, 40, and 50 kg N ha–1 in Basmati-370, Saket, and hybrid rice, respectively, and 40 kg N ha–1 in each cultivar of wheat) in rice and wheat. Vertical bar indicates the mean standard error (in rice, n = 15; in wheat, n = 30).

View larger version (27K): [in a new window]   Fig. 2. Initial crop growth rate (CGR, g m–2 day–1) of rice and wheat as influenced by N management—zero-N control, leaf color chart (LCC)-based (no basal N), and fixed-time recommended N split (28, 40, and 50 kg N ha–1 in Basmati-370, Saket, and hybrid rice, respectively, and 40 kg N ha–1 in each cultivar of wheat). Vertical bar indicates the mean standard error (n = 6).

View larger version (38K): [in a new window]   Fig. 3. Relationship between leaf color chart (LCC) score and chlorophyll meter reading starting from 15 d after transplanting till 50% flowering (45–65 d after transplanting) at 10-d interval in rice cultivars across N management options in 2001 and 2002.

View larger version (44K): [in a new window]   Fig. 4. Relationship between leaf color chart (LCC) score and chlorophyll meter reading from 21 (crown root initiation) to 81 to 91 (50% flowering) d after sowing at 10-d interval in wheat cultivars across N management options in 2001–2002 and 2002–2003.

View larger version (29K): [in a new window]   Fig. 5. Relationship between leaf color chart (LCC) score and chlorophyll meter reading (SPAD) for rice and wheat cultivars across N management options and growth stages in 2001–2002 and 2002–2003.

View larger version (65K): [in a new window]   Fig. 6. Total net return ($ ha–1) from different genotype combinations in rice–wheat system as influenced by leaf color chart (LCC)-based N management. LSD (P < 0.05) for system (S) = 20.6 and 16.7, N management (N) = 26.6 and 36.7, and S x N = 52.7 and 43.5. T1 = LCC 3, 4, and 5 for Basmati-370, Saket 4, and Hybrid 6111/PHB-71 rice, respectively, and LCC 4 for wheat; T2 = N applied as per fixed-time recommended split in rice and wheat.