HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Figures Only Full Text Free Full Text (PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Web of Science (21) Citing Articles via Google Scholar Google Scholar Articles by Hussain, F. Articles by Peng, S. Search for Related Content PubMed Articles by Hussain, F. Articles by Peng, S. Agricola Articles by Hussain, F. Articles by Peng, S. Related Collections Rice

RICE

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

k-bronson{at}tamu.edu

Low N fertilizer recovery efficiency (RE) remains a problem in rice (Oryza sativa L.) production in Asia. The chlorophyll meter has been shown to identify when rice is in need of a N top-dressing, that if applied would result in greater agronomic efficiency (AE) of N fertilizer than commonly practiced, pre-set timing schemes. Critical chlorophyll meter readings have been used to match N top-dressing with plant demand for the cultivar IR72, but fixed critical readings may not apply to multiple cultivars and locations. Our objective was to test the approach of using sufficiency indices, calculated from chlorophyll meter readings relative to well-fertilized reference plots, with several rice cultivars in the Philippines and in India by comparing with local fixed N timing recommendations. Chlorophyll meter readings were significantly affected by N management practice, cultivar, and time of application at both locations. Similar rice yields were produced with chlorophyll meter sufficiency indices compared with the fixed N timing treatment with 30 kg less N ha^-1 in the wet season in all cultivars at both locations. Compared with fixed-timing, 45 kg less N ha^-1 was used with the chlorophyll meter in the Philippines dry season without a yield reduction in three of four cultivars. In conclusion, chlorophyll meter sufficiency indices identified when several rice cultivars at two locations needed a N top-dressing, which resulted in greater AE of N fertilizer than local, pre-set splits.

Abbreviations: AE, agronomic efficiency • IRRI, International Rice Research Institute • RE, recovery efficiency

This article has been cited by other articles:

				S. M. Samborski, N. Tremblay, and E. Fallon Strategies to Make Use of Plant Sensors-Based Diagnostic Information for Nitrogen Recommendations Agron. J., July 7, 2009; 101(4): 800 - 816. [Abstract] [Full Text] [PDF]

				G. Stevens, A. Wrather, M. Rhine, E. Vories, and D. Dunn Predicting Rice Yield Response to Midseason Nitrogen with Plant Area Measurements Agron. J., February 26, 2008; 100(2): 387 - 392. [Abstract] [Full Text] [PDF]

				K. F. Bronson, J. D. Booker, J. W. Keeling, R. K. Boman, T. A. Wheeler, R. J. Lascano, and R. L. Nichols Cotton Canopy Reflectance at Landscape Scale as Affected by Nitrogen Fertilization Agron. J., April 27, 2005; 97(3): 654 - 660. [Abstract] [Full Text] [PDF]

				T. T. Chua, K. F. Bronson, J. D. Booker, J. W. Keeling, A. R. Mosier, J. P. Bordovsky, R. J. Lascano, C. J. Green, and E. Segarra In-Season Nitrogen Status Sensing in Irrigated Cotton: I. Yields and Nitrogen-15 Recovery Soil Sci. Soc. Am. J., September 1, 2003; 67(5): 1428 - 1438. [Abstract] [Full Text] [PDF]

				K. F. Bronson, T. T. Chua, J. D. Booker, J. W. Keeling, and R. J. Lascano In-Season Nitrogen Status Sensing in Irrigated Cotton: II. Leaf Nitrogen and Biomass Soil Sci. Soc. Am. J., September 1, 2003; 67(5): 1439 - 1448. [Abstract] [Full Text] [PDF]

				B. Singh, Y. Singh, J. K. Ladha, K. F. Bronson, V. Balasubramanian, J. Singh, and C. S. Khind Chlorophyll Meter- and Leaf Color Chart-Based Nitrogen Management for Rice and Wheat in Northwestern India Agron. J., July 1, 2002; 94(4): 821 - 829. [Abstract] [Full Text] [PDF]

				K. F. Bronson, A. B. Onken, J. W. Keeling, J. D. Booker, and H. A. Torbert Nitrogen Response in Cotton as Affected by Tillage System and Irrigation Level Soil Sci. Soc. Am. J., July 1, 2001; 65(4): 1153 - 1163. [Abstract] [Full Text] [PDF]