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Spatial variability of soil properties using geostatistical method: a case study of lower Brahmaputra plains, India

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Title Spatial variability of soil properties using geostatistical method: a case study of lower Brahmaputra plains, India
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Creator S.K. Reza, Utpal Baruah, Dipak Sarkar and S.K. Singh
 
Subject Spatial variability, Kriging, Semivariogram, Accuracy assessment, Soil properties
 
Description Not Available
Soil properties like pH, organic carbon (OC), available nitrogen (AN), available phosphorus (AP), and available potassium (AK) vary spatially from a field to a larger region scale and determine the soil fertility. This study addressed the spatial variability of soil properties in Brahmaputra plains, northeastern India using geostatistical method. For this, a total of 767 soil samples from a depth of 0–25 cm at an approximate interval of 1 km were collected over the entire Bongaigaon district of Assam. Data were analyzed both statistically and geostatistically on the basis of semivariogram. Soil properties showed large variability with greatest variation was observed in AP (86 %) where as the smallest variation was in pH (19 %). The semivariogram for all soil properties were best fitted by exponential models and showed a highest (2.7 km) range for OC and lowest (1.2 km) for AP. The nugget/sill ratio indicates a strong dependence for pH (12 %), moderate spatial dependence for available nutrients (53–72 %) and a weak spatial dependence for OC (77 %). Evaluation of spatial maps indicated that except for AN due
to high root mean square error (61.8), kriging could successfully interpolate other soil properties. Soil pH highly negatively correlated with OC (−0.330 * * ) and AN (−0.228 * * ) and highly positive correlated with AP (0.334 * * ) and AK (0.164 * * ). A highly significant correlation was also found between OC and AN (0.490 * * )
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Date 2020-05-24T14:05:24Z
2020-05-24T14:05:24Z
2016-01-01
 
Type Research Paper
 
Identifier Not Available
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http://krishi.icar.gov.in/jspui/handle/123456789/36222
 
Language English
 
Relation Not Available;
 
Publisher Springer