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Using Leaf Color Charts to Estimate Leaf Nitrogen Status of Rice

^a Rice Cultivation Res. Div., Natl. Crop Exp. Stn., Rural Dev. Administration, 209 Seodundong, Suwon 441-100, Republic of Korea
^b Crop, Soil, and Water Sci. Div., Int. Rice Res. Inst. (IRRI), DAPO Box 7777, Metro Manila, Philippines

View larger version (29K): [in a new window]   Fig. 1. Relationship between leaf color chart (LCC) scores and leaf N concentrations per unit dry weight (Ndw) at panicle initiation (PI), 9 d after PI (PI + 9 d), and flowering (FL) in the wet season (WS) of 2000 and at midtillering (MT), PI, and FL in the dry season (DS) of 2001 across three cultivars and four N rate treatments. Leaf color charts were developed by the International Rice Research Institute (IRRI); Zhejiang Agricultural University (ZAU), China; and the University of California, Davis (UCD), USA.

View larger version (31K): [in a new window]   Fig. 2. Relationship between leaf color chart (LCC) scores adjusted for specific leaf weight (SLW) and leaf N concentration per unit dry weight (Ndw) at panicle initiation (PI), 9 d after PI (PI + 9 d), and flowering (FL) in the wet season (WS) of 2000 and at midtillering (MT), PI, and FL in the dry season (DS) of 2001 across three cultivars and four N rate treatments. Leaf color charts were developed by the International Rice Research Institute (IRRI); Zhejiang Agricultural University (ZAU), China; and the University of California, Davis (UCD), USA.

View larger version (30K): [in a new window]   Fig. 3. Relationship between leaf color chart (LCC) scores and leaf N content per unit area (Na) at panicle initiation (PI), 9 d after PI (PI + 9 d), and flowering (FL) in the wet season (WS) of 2000 and at midtillering (MT), PI, and FL in the dry season (DS) of 2001 across three cultivars and four N rate treatments. Leaf color charts were developed by the International Rice Research Institute (IRRI); Zhejiang Agricultural University (ZAU), China; and the University of California, Davis (UCD), USA.

View larger version (30K): [in a new window]   Fig. 4. Relationship between leaf color chart (LCC) scores and chlorophyll meter (SPAD) values at panicle initiation (PI), 9 d after PI (PI + 9 d), and flowering (FL) in the wet season (WS) of 2000 and at midtillering (MT), PI, and FL in the dry season (DS) of 2001 across three cultivars and four N rate treatments. Leaf color charts were developed by the International Rice Research Institute (IRRI); Zhejiang Agricultural University (ZAU), China; and the University of California, Davis (UCD), USA.