| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
a Dep. Plant and Soil Sciences, Box 9555, Mississippi State Univ., Mississippi State, MS 39762 USA
b USDA-ARS, Application and Production Technology Res. Unit, P.O. Box 36, Stoneville, MS 38776 USA
tarpley{at}ra.msstate.edu
Diagnostic methods assaying leaf optical properties can aid rapid site-specific screening of crop nitrogen status. A set of calibration curves relating many 1.5-nm band reflectance ratios to cotton (Gossypium hirsutum L.) leaf N concentration was established from plants grown in sunlit growth chambers and at a range of nitrogen levels. Predicted and actual concentrations were compared by regression for a validation set of field-grown leaf samples from diverse genotypes. Only those ratios that combined a red-edge measure (700 or 716 nm) with a waveband of high reflectance in the very near infrared region (755–920 and 1000 nm) provided good precision (correlation) and accuracy (one-to-one relationship between predicted to actual values). Other indices that included a chlorophyll-based reflectance feature also had good precision but were less accurate than those obtained from the red-edge/very-near-infrared reflectance ratios.
Abbreviations: CDT, Central Daylight Savings Time • SPAR, Soil Plant Atmosphere Research
This article has been cited by other articles:
|
|
 |
|
  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]
|
|
|
|
|
|
D. Zhao, K. R. Reddy, V. G. Kakani, J. J. Read, and S. Koti Selection of Optimum Reflectance Ratios for Estimating Leaf Nitrogen and Chlorophyll Concentrations of Field-Grown Cotton Agron. J., January 1, 2005; 97(1): 89 - 98. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 S. S. Mangiafico and K. Guillard Turfgrass Reflectance Measurements, Chlorophyll, and Soil Nitrate Desorbed from Anion Exchange Membranes Crop Sci., January 1, 2005; 45(1): 259 - 265. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. L. Fridgen and J. J. Varco Dependency of Cotton Leaf Nitrogen, Chlorophyll, and Reflectance on Nitrogen and Potassium Availability Agron. J., January 1, 2004; 96(1): 63 - 69. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
L. Xue, W. Cao, W. Luo, T. Dai, and Y. Zhu Monitoring Leaf Nitrogen Status in Rice with Canopy Spectral Reflectance Agron. J., January 1, 2004; 96(1): 135 - 142. [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]
|
|
|
|
 |
|
 J. J. Read, L. Tarpley, J. M. McKinion, and K. R. Reddy Narrow-Waveband Reflectance Ratios for Remote Estimation of Nitrogen Status in Cotton J. Environ. Qual., September 1, 2002; 31(5): 1442 - 1452. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
| The SCI Journals | Agronomy Journal | Vadose Zone Journal | |||
| Journal of Natural Resources and Life Sciences Education |
Soil Science Society of America Journal | ||||
| Journal of Plant Registrations | Journal of Environmental Quality |
The Plant Genome | |||
