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Yield Prediction in Wheat (Triticum aestivum L.) using Spectral Reflectance Indices


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1 ICAR-Central Institute of Agricultural Engineering, Bhopal - 462 038, India
 

Influence of nitrogen on vegetative growth of wheat is significant, and can be monitored and assessed using vegetation indices derived from canopy reflectance at different phenological growth stages. The aim of the present work was to establish a regression model for yield prediction of wheat using spectral reflectance indices (SRIs), normalized difference nitrogen index (NDNI), normalized difference vegetation index (NDVI), normalized difference water index (NDWI) and soil adjusted vegetation index (SAVI) for selected phenological growth stages of wheat. The canopy spectral reflectance was recorded during three winter seasons (2014–2017) for irrigated wheat. A hyperspectral library of canopy reflectance was developed, which enables the study of spectra independent of different nitrogen management practices. It indicated that the precise level of nitrogen for irrigated wheat may be 90 kg ha-1 in vertisols under agro-climatic of central India. Coefficient of variation (CV) was determined based on significance test between eight levels of nitrogen and SRI values. On the basis of CV, NDVI and NDWI were selected among the four spectral indices for the study of correlation between grain and biomass yields and nitrogen levels for four growth stages, viz. tillering, booting, heading and milking. A regression model was developed to find the best representative stage for yield prediction among the four stages. The regression model indicated that the relations of NDVI with grain and biomass yields were stronger in the heading stage, and it resulted in 96% accurate estimation of grain and biomass yields in irrigated wheat.

Keywords

Nitrogen Management, Spectral Reflectance, Vegetation Indices, Wheat, Yield Estimation.
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  • Yield Prediction in Wheat (Triticum aestivum L.) using Spectral Reflectance Indices

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Authors

N. S. Chandel
ICAR-Central Institute of Agricultural Engineering, Bhopal - 462 038, India
P. S. Tiwari
ICAR-Central Institute of Agricultural Engineering, Bhopal - 462 038, India
K. P. Singh
ICAR-Central Institute of Agricultural Engineering, Bhopal - 462 038, India
D. Jat
ICAR-Central Institute of Agricultural Engineering, Bhopal - 462 038, India
B. B. Gaikwad
ICAR-Central Institute of Agricultural Engineering, Bhopal - 462 038, India
H. Tripathi
ICAR-Central Institute of Agricultural Engineering, Bhopal - 462 038, India
K. Golhani
ICAR-Central Institute of Agricultural Engineering, Bhopal - 462 038, India

Abstract


Influence of nitrogen on vegetative growth of wheat is significant, and can be monitored and assessed using vegetation indices derived from canopy reflectance at different phenological growth stages. The aim of the present work was to establish a regression model for yield prediction of wheat using spectral reflectance indices (SRIs), normalized difference nitrogen index (NDNI), normalized difference vegetation index (NDVI), normalized difference water index (NDWI) and soil adjusted vegetation index (SAVI) for selected phenological growth stages of wheat. The canopy spectral reflectance was recorded during three winter seasons (2014–2017) for irrigated wheat. A hyperspectral library of canopy reflectance was developed, which enables the study of spectra independent of different nitrogen management practices. It indicated that the precise level of nitrogen for irrigated wheat may be 90 kg ha-1 in vertisols under agro-climatic of central India. Coefficient of variation (CV) was determined based on significance test between eight levels of nitrogen and SRI values. On the basis of CV, NDVI and NDWI were selected among the four spectral indices for the study of correlation between grain and biomass yields and nitrogen levels for four growth stages, viz. tillering, booting, heading and milking. A regression model was developed to find the best representative stage for yield prediction among the four stages. The regression model indicated that the relations of NDVI with grain and biomass yields were stronger in the heading stage, and it resulted in 96% accurate estimation of grain and biomass yields in irrigated wheat.

Keywords


Nitrogen Management, Spectral Reflectance, Vegetation Indices, Wheat, Yield Estimation.

References





DOI: https://doi.org/10.18520/cs%2Fv116%2Fi2%2F272-278