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Chlorophyll Meter– and Leaf Color Chart–Based Nitrogen Management for Rice and Wheat in Northwestern India

Bijay Singh^a, Yadvinder Singh^a, Jagdish K. Ladha^*,b, Kevin F. Bronson^,c, Vethaiya Balasubramanian^b, Jagdeep Singh^a and Charan S. Khind^a

^a Dep. of Soils, Punjab Agric. Univ., Ludhiana 141004, Punjab, India
^b IRRI, DAPO Box 7777, Metro Manila, Philippines
^c Soil and Water Sci. Div., IRRI, DAPO Box 7777, Metro Manila, Philippines

View larger version (27K): [in a new window]   Fig. 1. Chlorophyll meter readings (SPAD values) as affected by N management in rice (1997) following recommended three fixed-split applications of 120 kg N ha-1 and application of 30 kg N ha-1 each time SPAD value fell below 37.5 (a total application of 90 kg N ha-1) at Ludhiana, India (Exp. I).

View larger version (18K): [in a new window]   Fig. 2. Relationship between grain yield of wheat with different preplant + crown root initiation (CRI) N levels and SPAD values recorded at maximum-tillering (MT) stage for three seasons (1996–1999) at Ludhiana, India (Exp. V).

View larger version (20K): [in a new window]   Fig. 3. Relationship between percent grain yield response of wheat to 30 kg N ha-1 applied at maximum tillering (MT) and SPAD values recorded at MT before N application for three seasons (1996–1999) at Ludhiana, India (Exp. V).