Spatial Distribution of Soil Nutrient Status of Biswanath District, Assam, North East India

Samikhya Bhuyan *

Assam Agricultural University, Jorhat 13,785013, India.

Dilip Kumar Patgiri

Assam Agricultural University, Jorhat 13,785013, India.

Simanta Jyoti Medhi

Volvo Group, 560122, India.

Debasish Chutia

ICAR-National Bureau of Soil Survey and Land Use Planning, Regional Centre, Jorhat-785004, India.

Ram Swaroop Meena

ICAR-National Bureau of Soil Survey and Land Use Planning, Regional Centre, Jorhat-785004, India.

Moharnab Sandillya

Indira Gandhi Krishi Vishwavidyalaya, Raipur, 492012, India.

*Author to whom correspondence should be addressed.


Abstract

Rice-based cropping system is a key for food security in Assam. However, the productivity of such systems has declined continuously due to deterioration in soil fertility owing mainly to faulty agricultural practices. The study was carried out to study the nutrient status of soils of the Biswanath district of Assam in the year 2021. A total of 200 no of geo-reference surface (up to 30 cm) soil samples were collected. The coefficient of variation (CV) was used for the interpretation of the variability of the indicators. Available phosphorous, available potassium DTPA-iron, DTPA-manganese, DTPA-zinc, and DTPA-copper were identified to be the most variable soil indicators (CV > 35%). Electrical conductivity, organic carbon, available nitrogen, and cation exchange capacity, were found as the moderately variable parameters (CV 15–35%). The least variation (CV < 15) was found pH. The mean pH, electrical conductivity and organic carbon were 5.23, 0.54 ds/m, and 0.81 percent respectively. The cation exchange capacity of the soil varied from 4.40 to 11.60 cmol(p+)/kg with the mean value of 6.74cmol(p+) /kg. The available nitrogen, available potassium and available phosphorus were 380.01kg /ha, 169.00 kg/ha and 38.01 kg/ha. The district's respective DTPA-Fe, DTPA-Cu, DTPA-Mn, and DTPA-Zn levels were found to be  83.34 mg/kg, 2.59 mg/kg, 22.25 mg/kg, and 0.79 mg/kg. The spatial distribution of each parameter was presented on the GIS platform for easy availability through IDW method of interpolation.

Keywords: Geo-reference, Cation exchange capacity, DTPA – Diethylene triamine pentaacetic acid, GIS-Geographical Information system, IDW- Inverse distance weighted interpolation


How to Cite

Bhuyan, Samikhya, Dilip Kumar Patgiri, Simanta Jyoti Medhi, Debasish Chutia, Ram Swaroop Meena, and Moharnab Sandillya. 2023. “Spatial Distribution of Soil Nutrient Status of Biswanath District, Assam, North East India”. International Journal of Plant & Soil Science 35 (8):145-57. https://doi.org/10.9734/ijpss/2023/v35i82891.