Gestion de la fertilité des sols par classe d'exploitation au Mali-Sud

S. Kanté

Research output: Thesisinternal PhD, WU

Abstract

In Southern Mali, it becomes increasingly difficult to take poor and overused arable land and pastures temporarily out of production, at a time when growing human and animal populations require increasing amounts for food and feed. In fact, the tendency is towards continuous cultivation, and as organic and mineral fertilizers appear not to compensate for nutrient losses, farmers, herdsmen and development workers are all worried about the sustainability of the current arable and agro-pastoral systems. This study carried out in two villages and for three 'manure and residue management' categories of farms, intends to: (1) identify manure production and residue management strategies that reflect differences in pressure on the land; (2) measure, monitor and calculate nutrient inputs and outputs per farm category; (3) perform a cost-benefit analysis on the management of crop residues; (4) develop a decision support tool for residue and manure management. The study shows that the higher the pressure on the land, the more efforts farmers have to make to feed their animals and to keep their soils fertile. During the 3 years of monitoring, partial nutrient balances (nutrient inputs in mineral and organic fertilizers minus nutrients withdrawn in crops and residues) were positive. Also, it is shown that the use of manure, including its residual effect during a second year, generates a surplus of 0.2-2 West African Francs (CFA) for every franc invested. Production of manure can be increased by 1 to 4 tons per farm holding, depending on the farm category. These all have their own strategy based on the socio-economic realities. Finally, some research avenues for soil fertility improvement are depicted, based on effective participation of all individuals that have a stake in rural development in Southern Mali.</p>
Original languageFrench
QualificationDoctor of Philosophy
Awarding Institution
  • Wageningen University
Supervisors/Advisors
  • van Keulen, H., Promotor
  • Smaling, Eric, Promotor
Award date12 Dec 2001
Place of PublicationS.l.
Print ISBNs9789058085696
Publication statusPublished - 2001

Keywords

  • soil fertility
  • manures
  • crop residues
  • nutrients
  • accounting
  • farm management
  • cost benefit analysis
  • semiarid zones
  • mali

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