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.

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.

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.