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Predicting soil organic carbon changes under paddy-wheat and sorghum-wheat cropping system – the Century C model experience

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Title Predicting soil organic carbon changes under paddy-wheat and sorghum-wheat cropping system – the Century C model experience
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Creator Bhattacharyya, T., Pal, D.K., Telpande, Bhagyashree A., Deshmukh, Ashwini S., Chandran, P., Ray, S.K. and Mandal, C.
 
Subject Predicting, soil organic carbon, paddy-wheat, sorghum-wheat, cropping system, the Century C model experience
 
Description Not Available
It is increasingly realized that the management of the agricultural land is an integral part to maintain global carbon market. This demands the need for soil carbon modelling exercises to simulate agricultural crops and their rotations to simulate soil organic matter decomposition under various soil conditions. Century model allows the simulation of complex agricultural management systems which include crop rotation, tillage practices, fertilization, irrigation, grazing and harvesting. Century uses a monthly time step utilizing average monthly maximum and minimum temperature and precipitation.
Two Long Term Fertilizer Experiments (LTFE) with different cropping systems from Mohanpur representing humid bio-climate of the Indo-Gangetic Plains, India (IGP) with mean annual rainfall of 1619 mm and Akola representing semi-arid bio-climate with MAR of 793 mm were selected. The site at LTFE Akola is grown for sorghum and wheat in rotation for 9 years since 1988. LTFE Mohanpur is grown for paddy and wheat in rotation for 19 years since 1986. Both these experiments involved different treatments with different doses of inorganic (fertilizer) and organic (farm yard manure, paddy straw, and green manure) inputs. Century model output was compared with available field data to evaluate its performance. To evaluate the modelled vs. estimated data, visual
examination of graphic output allows qualitative evaluation, whereas, for quantitative analyses statistical packages were utilized for the experimental period.
Century seems to model changes in SOC more successfully at Mohanpur (humid) site for all the treatments, with the control and the treatments with fertilizer alone and in combination with organic inputs showing the best agreement (root mean square error, RMSE 1 to 3) than Akola (semi-arid) site. At the semi-arid site, Century performed well for the early years of the experiment; and less well during the end of the experiment. The comparison between reported and modelled yield for the three crops (rice, wheat and sorghum) showed a good correlation (r = 0.8).
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Date 2020-06-30T14:15:16Z
2020-06-30T14:15:16Z
2010-10-08
 
Type Presentation
 
Identifier Bhattacharyya, T., Pal, D.K., Telpande, Bhagyashree A., Deshmukh, Ashwini S., Chandran, P., Ray, S.K. and Mandal, C. (2010). Predicting soil organic carbon changes under paddy-wheat and sorghum-wheat cropping system – the Century C model experience. ISSLUP National Seminar on Issues in Land Resource Management: Land Degradation, Climate Change and Land Use Diversification, October 8-10, Nagpur, 2010, (Abstract), pp. 113-114.
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http://krishi.icar.gov.in/jspui/handle/123456789/37739
 
Language English
 
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Publisher Not Available