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

This Article Abstract 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 Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Prasad, B. Articles by Klatt, A. R. Search for Related Content PubMed Articles by Prasad, B. Articles by Klatt, A. R. Agricola Articles by Prasad, B. Articles by Klatt, A. R. Related Collections Wheat Remote Sensing Crop Genetics

Potential Use of Spectral Reflectance Indices as a Selection Tool for Grain Yield in Winter Wheat under Great Plains Conditions

^a Dep. of Plant and Soil Sciences, 368 Ag Hall, Oklahoma State Univ., Stillwater, OK 74078
^b Dep. of Biosystems and Agricultural Engineering, Oklahoma State Univ., Stillwater, OK 74078
^c Dep. of Agronomy, Kansas State Univ., Manhattan, KS 66506. This research was partially funded by Oklahoma Agricultural Experiment Station, Oklahoma Wheat Commission, and Oklahoma Wheat Research Foundation

View larger version (23K): [in this window] [in a new window]   Figure 1. Changes in the pattern of different spectral reflectance indices with the advancement of growth stages: (a) and (b) represent Exp-1 in year 2003/2004 at Stillwater, and (c) and (d) represent Exp-2 in 2004/2005 at Lake Carl Blackwell. GNDVI, green normalized difference vegetation index; NWI-1, normalized water index 1; NWI-2, normalized water index 2; NWI-3, normalized water index 3; NWI-4, normalized water index 4; RNDVI, red normalized difference vegetation index; WI, water index. The bars indicate standard errors.

View larger version (32K): [in this window] [in a new window]   Figure 2. Phenotypic and genetic correlation coefficients between different spectral reflectance indices (mean of different growth stages across year/location) and grain yield (mean of two locations in Exp-1 and 2 yr in Exp-2 and Exp-3). GNDVI, green normalized difference vegetation index; NWI-1, normalized water index 1; NWI-2, normalized water index 2; NWI-3, normalized water index 3; NWI-4, normalized water index 4; RNDVI, red normalized difference vegetation index; SR, simple ratio; WI, water index.

View larger version (24K): [in this window] [in a new window]   Figure 3. Functional relationship between grain yield and normalized water index 3 (NWI-3) at three growth stages for two experiments. Top: Exp-1; bottom: Exp-2. *Significant at the 0.05 probability level; **significant at the 0.01 probability level. RMSE, root mean square error.

View larger version (25K): [in this window] [in a new window]   Figure 4. Functional relationship between grain yield and normalized water index 2 (NWI-2), normalized water index 3 (NWI-3), and normalized water index 4 (NWI-4) (estimated as the mean of the three growth stages). Top: Exp-2; middle: Exp-1; bottom: Exp-3. STW and LCB denote Stillwater and Lake Carl Blackwell sites, respectively. **Significant at the 0.01 probability level. RMSE, root mean square error.

View larger version (17K): [in this window] [in a new window]   Figure 5. Relationship between measured grain yield and predicted grain yield based on the linear equation using normalized water index 3 (NWI-3) as the predictor, estimated using the mean values of three growth stages for all three experiments across two locations/years. **Significant at the 0.01 probability level. RMSE, root mean square error.