A study on Iroko’s regeneration was done under four seed-trees (two in a young fallow and two in a secondary forest). The aim was to know ecological factors what are influencing his spatial distribution and ecological recruitment pattern of juveniles under its seed-trees. Under each seeder, eight directions were selected according to the wind rose on 1 ha. The light, slope, and litter thickness were measured over the eight directions divided into 5m x 3m plots. For each found juvenile, its high and distance to the seeder were measured. Seventy-three juveniles were found, 47 in the young fallow and 16 in the secondary forest. More juveniles were found in young fallow under seeder 2 (28 juveniles) and few juveniles under seeder 3 in the secondary forest (5 individuals). Means of 23.5 ± 4.5 and 8 ± 3 juveniles were found in young fallow and secondary forest respectively. The overall average of juveniles per seeder was 15.75 ± 7.75 juveniles.

This study aims to analyse spatial distribution and interactions that can exist between different Growth stages of Milicia excelsa (Iroko) and also, between its seedlings and adults of other species in order to provide to forest managers a tool for sustainable management of the natural population of this species. A full inventory was carried out in a semi-deciduous and anthropized forest of Central Africa in the north-east of DR Congo in six hectares with the Cartesian coordinates of all tree individual species taken. Data from this inventory were encoded and statistically analysed using the «ads» package of R Software to determine the point processes observed in this habitat. Results showed that Iroko trees have a random spatial distribution with low aggregations in the ecosystem. Individuals of the same growth stage live in aggregate while those of different growth stage have negative interactions (Competition - repulsion) on non-negligible radius. The diametric structure of its individuals is well balanced but showing a regeneration significantly low.

This study was conducted in the Lubumbashi region (DR Congo) during the 2013-2014 cropping season to determine optimal doses of chemical fertilizers to be applied to new varieties of maize. Four doses of mineral fertilizers (D1 =

The present study looked at the effects of planting date and spaces on growth and yield of soybean (Glycine max L. Merr) in soil and climatic conditions in Lubumbashi region. The trial was installed following a split plot design with three replicates. The main plots consisted of sowing dates (15th December, 30th December and 15th January) and the second plots included all seeding rates leading to a population of 125,000 plants per hectare (40 Cm x 20 cm was due to seed per hole; 40 cm x 40 cm with 2 seeds per hole and 60 cm x 40 cm with 3 seeds per hole). The results showed that late planting leads to slower growth and reduced yield of soybean. However, different plant densities adopted included similar effects in all the parameters observed. Planting soybean on the 15th December at a space of 40 cm x 20 cm x 3 seeds per hole would effectively increase soybean yield in the Lubumbashi region. The increase in performance would be desirable in order to fight against bad nutrition considering the scarcity of animal protein and the low- income populations.

Congolese agriculture is still largely extensive, characterized by low yields. For maize, the yields obtained in rural areas are about 10 times less than the potential of the culture; low soil fertility levels coupled with the use of non-performance equipment are the major causes. This test was installed following a split plot design to evaluate the effects of increasing doses of nitrogen fertilization on the behavior of two varieties of maize (UNILU and Katanga). The main plots included two varieties of maize and secondary plots, the different levels of mineral fertilizers (N0 = 0kg, N1 = 30kg, 60kg = N2, N3 = 90kg, 120kg = N4, N5 = 150kg, N6 = 180kg, N7 = 210 kg urea per hectare). The results show similarities between the two varieties and significant differences were obtained with N rates on flowering insertion height, to flowering days and maize yield. However, the analysis of variance indicates that the different nitrogen inputs did not influence maize emergence and its lodging resistance. However, the high rates of nitrogen have led early onset of inflorescences and allowed obtaining large plants. The dose N4 has a higher acceptability index compared to other doses it would be most advisable.