Weed competition and control in irrigated cotton in the Lake Chad Basin, Nigeria

1987 ◽  
Vol 33 (1) ◽  
pp. 13-15 ◽  
Author(s):  
L. I. Okafor
Urban Forum ◽  
2021 ◽  
Author(s):  
Oyewole Simon Oginni

AbstractSince over a decade of conflicts in the Lake Chad Basin region, different measures have been adopted to regulate the mobility of displaced persons in border cities. Mubi—like other transit sites—is both a place of care and control, of incentivization and eviction and of inclusion and exclusion. To nuance these contradictions, I argue that we might have to pay attention to arrival practices in transit sites, particularly the encounter with infrastructures, which are intertwined and profoundly co-constitutive of the displaced persons’ realities. In transit sites, arrival is practised and lived temporally and relationally among the displaced persons, despite the conditions of exile and immobility. Urban infrastructures (such as marketplaces, transit camps and living rooms) transform and enact the strategy adopted by the displaced persons to navigate daily life and to ‘move on’ from conditions of exile and confinement. Moving on, in this sense, is a strategy to overcome the disruption of the temporality of arrival practices from the Nigerian state regulation of mobility through incentivization and encampment policies. I demonstrate that both incentivization and encampment aim towards a common goal, which is to render displaced persons invisible in urban centres while becoming a raw material for capital production. The regulation enables a new form of unplanned spaces to emerge that are hyper-visible and super-precarious at the urban margins. This paper calls for a critical perspective on humanitarian urbanism in the Global South.


Earth ◽  
2021 ◽  
Vol 2 (2) ◽  
pp. 340-356
Author(s):  
Forrest W. Black ◽  
Jejung Lee ◽  
Charles M. Ichoku ◽  
Luke Ellison ◽  
Charles K. Gatebe ◽  
...  

The present study investigated the effect of biomass burning on the water cycle using a case study of the Chari–Logone Catchment of the Lake Chad Basin (LCB). The Chari–Logone catchment was selected because it supplies over 90% of the water input to the lake, which is the largest basin in central Africa. Two water balance simulations, one considering burning and one without, were compared from the years 2003 to 2011. For a more comprehensive assessment of the effects of burning, albedo change, which has been shown to have a significant impact on a number of environmental factors, was used as a model input for calculating potential evapotranspiration (ET). Analysis of the burning scenario showed that burning grassland, which comprises almost 75% of the total Chari–Logone land cover, causes increased ET and runoff during the dry season (November–March). Recent studies have demonstrated that there is an increasing trend in the LCB of converting shrubland, grassland, and wetlands to cropland. This change from grassland to cropland has the potential to decrease the amount of water available to water bodies during the winter. All vegetative classes in a burning scenario showed a decrease in ET during the wet season. Although a decrease in annual precipitation in global circulation processes such as the El Niño Southern Oscillation would cause droughts and induce wildfires in the Sahel, the present study shows that a decrease in ET by the human-induced burning would cause a severe decrease in precipitation as well.


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