Kantety, R.V. and van Santen, E. and Woods, F.M. and Wood, C.W. (1996) Chlorophyll meter predicts nitrogen status of tall fescue. Journal of Plant Nutrition, 19 (6). pp. 881-889.
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Abstract
The nitrogen (N) status of a crop can be used to predict yield and supplemental N fertilizer requirements, and rapid techniques for evaluating the N status of crops are needed. A study was conducted to determine the feasibility of using a hand held chlorophyll meter (SPAD 502, Minolta Co. Ltd., Japan) to monitor N status of tall fescue (Festuca arundinacea Schreb.). Four diverse tall fescue genotypes were grown at three locations in Alabama and fertilized at four N‐rates from 0 to 336 kg ha‐1. A similar experiment was conducted in the greenhouse using soil from the same field sites. Chlorophyll meter readings (SPAD) were taken, and extractable chlorophyll content, tissue N concentration and dry matter yield were determined at harvest. SPAD, extractable chlorophyll content, tissue N concentration, and dry matter yield increased quadratically (0.67 < R2 < 0.99) with increasing N fertilization in both experiments. All genotypes responded similarly to applied N, with some differences in magnitude. Relationships between SPAD meter readings and extractable chlorophyll and tissue N concentrations were linear with r2 > 0.95. An additional independent variable, the square root of the inverse of SPAD, lowered the residual mean square by 11 and 16%, respectively, for tissue‐N and chlorophyll concentrations, but did not increase the R2. This would be preferred for predictive purposes. Tissue N concentrations at higher N‐rates were sufficient for maximum yield which occurred at 290 and 248 kg N ha‐1 for greenhouse and field, respectively, but were lower than previously reported sufficiency values. The chlorophyll meter is an easy and efficient method of detecting tall fescue N status.
| Item Type: | Article |
|---|---|
| Author Affiliation: | Department of Agronomy and Soils, Auburn University, 202 Funchess Hall, Alabama, AL, 36849–5414 |
| Subjects: | Plant Production |
| Divisions: | General |
| Depositing User: | Mr Siva Shankar |
| Date Deposited: | 22 Jul 2013 04:43 |
| Last Modified: | 22 Jul 2013 04:43 |
| Official URL: | http://dx.doi.org/10.1080/01904169609365168 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/11188 |
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