Weeds in our cultures are a constraint for farmers, which as far as possible combine a lot of effort to eradicate them. In addition to this aspect of nuisance, weeds could also be used for the prediction of soil fertility. Thus a floristic inventory study was conducted successively in 12 fields in the hinterland of Lubumbashi left on road 2axes: Kasumbalesa and Kipushi. Soil samples were collected in the forties randomly placed in the fields and then analyzed in the laboratory in order to identify the pH. The varied multi analyzes (PCA) have established a significant and positive correlation between the variables studied which would explain the invasion of the common bean culture despite the interventions of weeding. 24 species grouped into 7 families and 5 biological types including: therophytes 66.66%; Geophytes 12.5%; 8.33% hemicryptophytes, chamaephytes and finally Nanophanérophytes 4.16% proved tolerant of the pH tested (4.9 to 6.77) with (5.83) as an average value which allows farmers to have information not only in relation to different biological types defined but also on the distribution of weeds in relation to soil pH to ensure a good crop management by a successful weed management.

As part of the management of weeds common bean crop (Phaseolus vulgaris L.), a study of the effects of two methods of weed control on grain yield of 3 varieties of common bean was conducted at the research station INERA Kipopo. The experimental design was a split-plot design with 3 replications and 3 blocks, as the main factor varieties and secondary modes weeding, observations were: the number of days to flowering; number of days to pod; number of days for the filling of pods; number of pods per plant, number of seeds per pod; weight of 100 seeds; the yield of the crop. The results obtained revealed that only the variety is distinguished from APN130 Kapira D6Kenya and share his great influence on the number of pods per plant; number of seeds; 100 seed weight and yield. No interaction of two factors was observed in wholes settings, however weeding methods have influenced the performance of which the highest was obtained by manual weeding with APN 130, two manual weedings are sufficient for the mastery of weeds. For cons, the dose of 3 l / ha basagran did not provide good control of weeds which 7 were resistant. However the combination of basagran to another active ingredient would be desirable to ensure better management.