@article{fdi:010084212,
  title = {{P}rediction of soil hydraulic properties using {VIS}-{NIR} spectral data in semi-arid region of {N}orthern {K}arnataka {P}lateau},
  author = {{D}harumarajan, {S}. and {L}alitha, {M}. and {G}omez, {C}{\'e}cile and {V}asundhara, {R}. and {K}alaiselvi, {B}. and {H}egde, {R}.},
  editor = {},
  language = {{ENG}},
  abstract = {{F}ield capacity ({FC}) and permanent wilting point ({PWP}) are the important soil hydraulic properties which determine the availability of water for plant growth. {C}onventional estimation of soil hydraulic properties is tedious and expensive which are normally derived from pedo-transfer functions. {V}isible and near-infrared ({V}is{NIR}) spectroscopy is a low-cost, non-destructive alternative method for the rapid estimation of soil properties. {T}he present study was carried out to predict soil hydraulic properties using {V}is-{NIR} spectral data in the semi-arid region of the {N}orthern {K}arnataka plateau. {S}pectral data of 558 soil samples were acquired using {F}ield {S}pec {ASD} {S}pectroradiometer and three models (support vector machine, random forest and partial least square regression) were evaluated for prediction of {FC} and {PWP}. {T}he models were calibrated using 2/3rd of total observations and validated using 1/3rd of observations. {T}he validation results showed that {RF} and {SVM} provided slightly higher performance compared to {PLSR} model. {P}ermanent wilting point was predicted well ({R}-2 = 0.70-0.74, {RMSE} = 5.44-5.74%) compared to field capacity ({R}-2 = 0.66-0.69 and {RMSE} = 7.25-7.51%). {A}mong the soil orders, {FC} and {PWP} of {V}ertisols were poorly predicted by {V}is-{NIR} spectra ({R}-2 = 0.34&0.42) and moderately predicted for {A}lfisols (0.44&0.52) and {I}nceptisols (0.55&0.65) while excellent prediction was recorded for {E}ntisols (0.83&0.76). {T}he present results showed that {V}is-{NIR} spectroscopy is helpful for fast estimation of hydraulic properties in semi-arid regions of the country with high accuracy.},
  keywords = {{H}ydraulic properties ; {F}ield capacity ; {P}ermanent wilting point ; {V}is-{NIR} ; spectroscopy ; {R}andom forest model ; {A}lfisols ; {V}ertisols ; {INDE} ; {ZONE} {SEMIARIDE} ; {KARNATAKA} {PLATEAU}},
  booktitle = {},
  journal = {{G}eoderma {R}egional},
  volume = {28},
  numero = {},
  pages = {e00475 [7 p.]},
  ISSN = {2352-0094},
  year = {2022},
  DOI = {10.1016/j.geodrs.2021.e00475},
  URL = {https://www.documentation.ird.fr/hor/fdi:010084212},
}