The present study was initiated to evaluate the factors influencing the profitability of the crop of okra in soil and climatic conditions and socio-economic Lubumbashi. The culture was installed in the actual conditions at the farm Kasapa the University of Lubumbashi on an area of one hectare. The observed agronomic parameters include the rate of emergence and survival, height of the plans, the number of harvests and yield. Then the flow of products (fruits) was carried out in the different markets of the city of Lubumbashi. The results revealed that the average survival rate is 91%, a decrease of 4% compared to the emergence rate originally recorded. The yield obtained (3.3 tonnes / ha) would be explained by several factors, the most limiting would phytosanitary restrictions, transportation costs and low producer prices. In the soil and climate and socio-economic context of Lubumbashi, these factors significantly limit the financial profitability (9% is a profit of $ 9 for $ 100 invested over a period of four months) culture okra. Thus, improved profitability of this culture would pass through minimizing transportation costs and reducing the gap between market prices and those for the production and control of the technical route.

The present work was undertaken to study the effects of planting date and spacing on growth and production of cowpea (Vigna unguiculata L. Walp.) in view to increase cowpea yield in Lubumbashi. The experiment was installed following a split splot device with 3 repetitions. The main plots consisted of 3 planting dates (15 December, 30 December and 15 January) and secondary plots, three spacing leading to a density of 125,000 plants per hectare (40 cm x 20 cm x 1 plant; 40 cm x 40 cm x 2 plants and 60 cm x 60 cm x 3 plants). Observations were made on growth and yield parameters. The results showed that late sowing leads to slower growth and lower yield. Sowing the third time results in a lower yield of 50% (500kg.ha-1) compared to planting at first date (1000 kg.ha-1). In addition, the higher yield was obtained with the second planting date (1300 kg.ha-1). The different spacings induced similar effects for all parameters observed. Sowing cowpea on December 30 and spacing of 60 cm x 40 cm x 3 plants would increase effectively cowpea yield in the city of Lubumbashi and its hinterland.

Two essays were carried out to evaluate the effect of different types of auxins on root formation and the influence of dark and culture substratum on tetraploid hybrid FHIA-01 proliferation (Musa spp. AAAB). The plant material consisted of tissue culture plantlets of FHIA -01 hybrid tetraploid banana (Musa AAAB). The trial, with a total of 10 replicates per treatment was carried out in each pot containing five explants. For both tests, a combination of two cytokinins was enriched in culture substratum. The results obtained show that regeneration was high in culture substratum with light than substratum without meta-methoxytopolin riboside (M2). The medium M2 to the light induced a higher number of the buds compared to medium dose reduced meta-methoxytopolin riboside (M1). Meanwhile, only explants inoculated on the medium M1 in the dark induced callus. The bud proliferation, induction of root, leaf and the broadcast callus induction are significantly influenced by the different substratum and photoperiod, increasing the explant size, the number of emerged leaves, roots and the number of the weight of explant with buds proliferated. Formulating specific culture media cultivars according to group (ABB or AAA) and the choice of culture conditions (light intensity) would avoid consecutive failures and low proliferation in in vitro culture.