Whole-farm nitrogen cycling and intensification of crop-livestock systems in the highlands of Madagascar:an application of network analysis

Alvarez, S. and Rufino, M. C. and Vayssières, J. and Salgado, P. and Tittonell, P. and Tillard, E. and Bocquier, F. (2014) Whole-farm nitrogen cycling and intensification of crop-livestock systems in the highlands of Madagascar:an application of network analysis. Agricultural Systems, 126. pp. 25-37. ISSN 0308-521X

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Food insecurity, soil fertility depletion and strong competition for biomass are commonly observed in smallholder crop-livestock systems. The objective of this study was to explore options to improve farm-level nitrogen cycling, productivity and economic performance through the analysis of N flows within four contrasting crop-livestock farm systems of Madagascar highlands. Farms were conceptualized as networks where the compartments were the household and their farming activities, all connected by N flows. Indicators assessing network size and cycling, and the organization and diversity of the N flows, were compared with system productivity, food self-sufficiency, and gross margins for the current situation and under four scenarios of intensification (i) dairy production increased by increasing N inputs as supplementary feed; (ii) crop production increased by increasing N inputs as mineral fertilizer; (iii) manure management improved to increase N conservation during storage and application to soils; (iv) a combination of the two most economically attractive scenarios (i and iii). The four case study farms represent local diversity differing widely in terms of network size, with total annual system N throughput ranging from 113 to 1037kgN per capita, and in terms of N cycling, from 3 to 41kgN per capita per year. They differed less in terms of external dependence, from 0.26 to 0.41kgN kgN-1. Improving N conservation through improved manure management (scenario iii) had a positive impact on gross margin, and this in combination with increased concentrate supply (scenario iv) led to increases in whole-farm N use efficiencies from 2% to 50%, in N cycling from 9% to 68% and in food self-sufficiency from 12% to 37% across farm types. Gross margin was the most sensitive indicator to changes in management. Intensification through scenario iv had the highest impact on farm productivity, gross margin, food self-sufficiency, and environment sustainability (N use efficiency, capacity of the soil to stock N).

Item Type: Journal Article
Journal or Publication Title: Agricultural Systems
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/1100/1103
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 84340
Deposited By: ep_importer_pure
Deposited On: 25 Jan 2017 14:10
Refereed?: Yes
Published?: Published
Last Modified: 15 Jan 2020 03:22
URI: https://eprints.lancs.ac.uk/id/eprint/84340

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