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Diffuse reflectance spectroscopy (DRS) for rapid soil testing and soil quality assessment in smallholder farms

OAR@ICRISAT

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Relation http://oar.icrisat.org/12055/
https://bsssjournals.onlinelibrary.wiley.com/doi/abs/10.1111/ejss.13358
https://bsssjournals.onlinelibrary.wiley.com/doi/abs/10.1111/ejss.13358
 
Title Diffuse reflectance spectroscopy (DRS) for rapid soil testing
and soil quality assessment in smallholder farms
 
Creator Majeed, Israr
Garg, K K
Venkataradha, A
Naveen, K P
Roy, S
Reddy, N N
Singh, Ramesh
Anantha, K H
Dixit, S
Bhabani, S D
 
Subject Soil
 
Description Rapid soil testing and soil quality assessment are essential to address soil degradation and low farm incomes in smallholder farms. With the objective of testing diffuse reflectance spectroscopy (DRS) to rapidly assess soil chemical properties, nutrient content and a soil quality index (SQI), samples of surface soil were collected from 1113 smallholder farms in seven districts in Bundelkhand
region of Uttar Pradesh, India. A minimum dataset (MDS) approach was followed to estimate SQI using the three chemical parameters of soil pH, electrical conductivity (EC) and soil organic carbon (SOC), and 11 different soil nutrients. Principal component and correlation analyses showed that soil pH, SOC content and three available nutrients - copper (Cu), iron (Fe) and sulphur (S)
- may constitute the MDS. Estimated SQI values showed strong positive correlation with crop yields. Results of chemometric modelling showed that the DRS approach could yield the coefficient of determination (R2) values in the validation datasets ranging from 0.79 to 0.94 for exchangeable calcium (Ca) followed by 0.67–0.88 for exchangeable potassium (K), 0.52–0.86 for SOC and 0.53–0.81
for available boron (B) content. Except in one district, the DRS approach could be used to estimate SQI values with R2 values in the range of 0.63–0.81; an R2 value of 0.71 was obtained in the pooled dataset. We also estimated the three-tier soil test crop response (STCR) ratings to compare DRS and wet chemistry soil testing approaches. Similar STCR ratings were obtained for both these approaches in more than 86% of the samples. Parameters for which both the
methods yielded similar ratings in more than 80% of the samples were EC (>98%), pH and exchangeable Ca (>81%) and available B (>89%). With similar ratings, these results suggest that the DRS approach may safely be used for
farmers' fields, replacing the traditional wet analysis approach of soil testing.
 
Publisher Wiley
 
Date 2023-03-09
 
Type Article
NonPeerReviewed
 
Format application/pdf
 
Language en
 
Identifier http://oar.icrisat.org/12055/1/Israr_EJSS.pdf
Majeed, Israr and Garg, K K and Venkataradha, A and Naveen, K P and Roy, S and Reddy, N N and Singh, Ramesh and Anantha, K H and Dixit, S and Bhabani, S D (2023) Diffuse reflectance spectroscopy (DRS) for rapid soil testing and soil quality assessment in smallholder farms. European Journal Of Soil Science, 72 (2). pp. 1-19.