Sustainability and economic efficiency in corn production could increase by the integrated weed management to a tolerable level. A study was conducted at the Kasapa farm during the 2013-2014 crop year to assess growth, grain yield of two improved varieties of maize (UNILU and Bukidi-Bukidi) and production economics Starting from two modes of weeding (manual weeding hoe and chemical weeding) and 4 weed management alternatives: {Weeding Manual (TO), 3l / ha atrazine (T1), 3l / ha acetochlor (T2), 6l / ha atrazine and acetochlor mixture (T3)}. The results revealed that the two varieties were similar height perspective of seedlings and yield. Six species have been recorded, but only two species (Setaria pumila and Cyperus rotundus) were resistant to their presence in all plots. Compared to weed management practices, performance culture has evolved as follows: T2> T3> T1> T0.Cependant an acceptable economic return was obtained with 3l / ha acetochlor. To intensify maize production in the study area, the mixture of acetochlor and atrazine is Discourage while adoption of acetochlor requires an extension on these modes.

In Katanga, the poverty and the deterioration of the livelihoods are at the base of the food insecurity especially in the agricultural households. The food request is an especially function of the number of people and purchasing power to them. This study had like objective to apprehend the food safety of the agricultural households of the territory of Kipushi by their food expenditure. To arrive there, an investigation was led to nearly 90 households taken in a random way in 6 villages of the territory of Kipushi over one period active of February in June 2012.The results of this study showed that the food expenditure by household was on average 3, 47$ for the whole of all the studied villages whose average size of household was 6,3. The daily consumption per capita in monetary term varied between 0, 47 and 0, 63$ and represents a convincing indicator of level of increased poverty (1, 25$ per capita per day). As for food consumption, the corn, the vegetables (cassava leaves) and the palm oil are food very consumed in the villages. The food practices, accessibility, the availability, the price would be the determining factors food consumption in the villages and at the same time the price of meat products would be a factor limiting for more than one agricultural household. Next research is very necessary to study the livelihoods of these households.

In the hinterland of Lubumbashi characterized by peasant agriculture floristic investigations were conducted in common bean crop (Phaseolus vulgaris) during the 2014 growing season in 12 fields spread over two roads which: Kasumbalesa and Kipushi. Thus 10 quadrats 1m side were randomly placed in each field. The inventory identified 24 species grouped into 7 families and 5 biological types including: therophytes 66.66%; Geophytes 12.5%; 8.33% hemicryptophytes chamaephytes and finally Nanophan

In sub-Saharan Africa, the relationship between modes of weed management by chemical molecules and soil quality, resulting remains little known or poorly farmers. This study highlights the influence of mineral fertilizer and herbicide on increasing grain yield of common bean in Lubumbashi by the maintenance of the weed population to a tolerable level. The experiment was installed on a device in a ferralsol split splot with 3 repetitions. The main plots consisted of three types of fertilizer: NPK1 (10-20-10); NPK2 (17-17-17) and NPK3 (14-18-18) at the rate of 200kg / ha and secondary plots of 3 doses of the herbicide glyphosate D1 (1.5l / ha); D2 (3 l / ha) and D3 (4.5 l / ha). Observations were made on growth parameters, yield and weed infestation rate on the plots. The results obtained showed that the highest yield was observed on plots with an average of NPK1avec 2,1t / ha, no dose of herbicide has influenced performance. However, the herbicide was ineffective with weeds; high levels of infestation plots by weeds were observed in plots receiving NPK3 and NPK2. The combination of mineral fertilizer and herbicide was ineffective and would be a solution to weeding a ferralsol if we added organic matter and providing a second application based on a selective molecule to complement the action of first applied near weeds.