Impact of Land Uses on Productivity of Soils of Sundarban
Impact of Land Uses on Productivity of Soils of Sundarban
Pulin B. Chakraborty Dept. of Soil & Water Conservation Bidhan Chandra Krishi Viswa Vidyalaya Regional Research Station (CSZ), Kakdwip 743 347, West Bengal e-mail: pulin_chakraborty@yahoo.co.in
ABSTRACT
The study was undertaken in the micro watershed located in Kakdwip Block in saline eco-system of Sundarban. Composite soils from 0-15 cm depth of double and mono-cropped paddy fields as well as grassed and barren lands were analyzed for different physical (particle size distribution, bulk density, aggregate stability, water holding capacity, moisture evaporation, plasticity) and chemical(organic carbon, SAR, ESP, CEC, , pH, EC as well as total N, available phosphate P2O5 and K2O) properties Result reveals that low land contains 49.8% clay and it was more than 50% in both double and mono-cropped paddy fields, which resulted 99% aggregation in these land uses. All the physical and hydrological parameters were found to be highly correlated with both clay and organic matter content of the soil. The result further revealed that pH of the soils under cultivated double and mono-cropped land uses shows acidic reaction varying from 5.3 to 4.6; whereas it was alkaline in nature in rest of the land uses. ECe shows > 2.0 dSm-1 in both the land situations. Other chemical indicators viz. SAR, ESP, CEC were found to be relatively higher in lowland situations due to higher clay and organic matter content of the soil. Total nitrogen content although did not show any variation with respect to land uses and land situations, but, considerably higher content of available P2O5 and K2O in either double cropped or mono-cropped lands in lowland situation was found to be associated with high clay content. Finally it was revealed that both double and mono-cropped paddy land under medium land situation proved to have highest productivity. In lowland situation, productivity of cropped lands
Pulin B. Chakraborty Dept. of Soil & Water Conservation Bidhan Chandra Krishi Viswa Vidyalaya Regional Research Station (CSZ), Kakdwip 743 347, West Bengal e-mail: pulin_chakraborty@yahoo.co.in
ABSTRACT
The study was undertaken in the micro watershed located in Kakdwip Block in saline eco-system of Sundarban. Composite soils from 0-15 cm depth of double and mono-cropped paddy fields as well as grassed and barren lands were analyzed for different physical (particle size distribution, bulk density, aggregate stability, water holding capacity, moisture evaporation, plasticity) and chemical(organic carbon, SAR, ESP, CEC, , pH, EC as well as total N, available phosphate P2O5 and K2O) properties Result reveals that low land contains 49.8% clay and it was more than 50% in both double and mono-cropped paddy fields, which resulted 99% aggregation in these land uses. All the physical and hydrological parameters were found to be highly correlated with both clay and organic matter content of the soil. The result further revealed that pH of the soils under cultivated double and mono-cropped land uses shows acidic reaction varying from 5.3 to 4.6; whereas it was alkaline in nature in rest of the land uses. ECe shows > 2.0 dSm-1 in both the land situations. Other chemical indicators viz. SAR, ESP, CEC were found to be relatively higher in lowland situations due to higher clay and organic matter content of the soil. Total nitrogen content although did not show any variation with respect to land uses and land situations, but, considerably higher content of available P2O5 and K2O in either double cropped or mono-cropped lands in lowland situation was found to be associated with high clay content. Finally it was revealed that both double and mono-cropped paddy land under medium land situation proved to have highest productivity. In lowland situation, productivity of cropped lands
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