Effets des pratiques agro-écologiques sur les caractéristiques chimiques majeures et le stock de carbone du sol à l’Est du Burkina Faso

Abstract

The Sahelian countries are faced with the recurrent problem of declining soil fertility. In response to this decline in soil fertility, various strategies are implemented by producers to improve soil fertility.The study took place in farmer’s fields in the villages of Bilanga yanga, Tiguili and Kolokomi (in eastern Burkina Faso). The objective was to assess the impacts of agro-ecological practices on chemical characteristics, soil carbon stock and sorghum yields. The interviews with the producers made it possible to select the most widespread practices. These practices are: Stony lines (CP) + Burying Cereal Straw (Enf) + Organic Fumure (FO) (5 repetitions), CP + FO (5 repetitions), CP + Zaï (5 repetitions), Enf + FO (4 repetitions), FO (5 repetitions) and Control (5 repetitions). For the evaluation of sorghum yields, four (4) practices were selected: CP + Enf + FO, CP + Zaï, Enf + FO and Control. Overall, practices incorporating stone lines recorded the highest grades (p < 0,05) for chemical characteristics and soil carbon stock. The results showed an increase in carbon stock showed from 20 % to 46 % of practices incorporating stony lines. Are agro-ecological practices with stony lines the most effective in improving soil fertility in eastern Burkina Faso?

Keywords

• stony lines
• zaï
• organic manure
• burying of residues
• soil fertility
• carbon stock