I S S N 2 3 4 7 -3487 V o l u m e 1 3 N u m b e r 1 0 J o u r n a l o f A d v a n c e s i n P h y s i c s
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ABSTRACTThis study aims at assessing the relationship between soil water stock and the yield of agricultural practices in Tougou catchment located in northern Burkina Faso. It is a region that has experienced a significant and continuous degradation of its natural resources, especially soils, due to the climate variability and the rapid increase of the population. Areas allocated to subsistence agriculture are increasing at the expense of pastoral land. This degradation causes a change in processes and mechanisms that control ecological systems. In order to provide solutions to this issue, some agricultural practices have been implemented to improve crop yield. This is particularly the case of traditional techniques:"zaï", "stony line" and "half-moon", which can significantly improve the soil infiltration capacity and yield. Daily monitoring of soil moisture and pressure in experimental plots based on these agricultural practices show that half-moon and Zaï provided good yield with 2180kg / ha and 1070 kg / ha respectively compared to that of the control plot with about 480 kg/ha. These important yields are due in large part to the improvement of the retention capacity of these soils, thus giving to crops the necessary water need for their development even in drought periods
Indexing terms/Keywordswater content, yield, agricultural practices, crop, sahelian climate, Tougou, Burkina Faso
INTRODUCTIONFor several decades, the increasing of population pressure in arid zones located in the north and south of the Sahara has led to profound changes in the management and use of natural resources and agricultural land [1,2,3] These anthropogenic disturbances result in scarcity of natural vegetation, soil degradation (water and wind erosion), deterioration of the soil water regime, and a decrease in water efficiency for crop production. This has negatively affected agricultural activities in several Sahelian countries. Agricultural yields decline very significantly in this region as a result of climatic hazards and anthropogenic actions [4]. Indeed, according to the fourth report of the Intergovernmental Panel on Climate Change [5], rainfed crop yields could fall by 50% by 2020 in most of these countries. This is unfortunately the case for Burkina Faso where the situation is very pronounced in its Sahelian part. Indeed, according to the assessment provided in 1994 by the Institute for Environment and Agricultural Research of Burkina Faso (INERA) [6], about 90% of arable land in Burkina Faso Sahel is severely degraded, leading to a reduction in useful agricultural land per capita and marginal land use. In addition, the decline in annual rainfall in this region (more than 20%) since the end of the 1960s [7] has resulted in yield reduction of cereal production of about 16-20% [8]. In this region, the degradation of soil productivity results from the unbalance of organic and mineral matter induced by repeated fires, o...