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Use of Chlorophyll Meter Sufficiency Indices for Nitrogen Management of Irrigated Rice in Asia

^a National Agricultural Research Center, Land Resources, Institute P.O. NIH, Islamabad, Pakistan
^b Soil and Water Sciences Div., IRRI, P.O. Box 3127, 1271 Makati City, Philippines, currently Texas A&M University, Texas Agric. Exp. Stn., Route 3, Box 219, Lubbock, TX 79401 USA
^c Punjab Agricultural Univ., Dep. of Soils, Ludhiana, India
^d Agronomy, Plant Physiology, and Agroecology Div., IRRI, P.O. Box 3127, 1271 Makati City, Philippines

View larger version (22K): [in a new window]   Fig. 1 Chlorophyll meter readings as affected by cultivar and N management in Los Baños, Philippines, during the wet season in 1997. The 90% sufficiency index readings were calculated as 90% of the well-fertilized plot readings. Arrows indicate time of 30 kg N ha-1 top-dressing to chlorophyll meter–based treatments