Cassava is considered the most important crop in the tropics in terms of its high yield, its potential to produce large amounts of calories in food and income to producers. In Central and East Africa, from 2000 to 2010, the African mosaic no longer constituted a major constraint to culture for research because researchers from national and international institutions mobilized to fight the pandemic by developing no varieties resistant to this cassava virus. Unfortunately, the period following the year 2010, the culture experienced a qualitative and quantitative depreciation of the tuberous roots in most producing regions. All the varieties selected for mosaic resistance are ravaged by the brown streak disease which extends from East to Central Africa without sparing the East of the Democratic Republic of Congo with its varieties selected and distributed by the Centers INERA research centers such as Liyayi (MM 96/0287), Mayombe (MM 96/7752), Sawasawa (MM 96/3920), Obama 1 (TME 419). As part of the fight against the disease, the presence of which has been confirmed in the East since 2012, we have set up a participatory variety selection trial in two sites, in particular in the Mulungu Research Station and in the Ruzizi plain, where disease pressure is greatest. The objective of the trial was to identify at least one material tolerant or resistant to brown streak after evaluation of a few clones having passed the stage of the uniform yield trial. Three repetitions are installed in the two sites with 5 materials and 2 improved controls, one of which is tolerant and the other sensitive to the disease. Cuttings taken from apparently healthy plants are planted at 1mx1m spacing. After 12 months of vegetation, the trial is harvested and several materials have proven to be efficient to different degrees. Only clone MLG 2011/092 showed no brown streak symptoms on leaves and roots. Its average yield of 36.661 t/ha is far above the average yield of the trial (34.830 t/ha) on the one hand; and that of the improved control Nabana (32.708 t/ha) which is currently the most cultivated variety for its tolerance to the disease in the most affected area. The MLG 2010/180 clone also seems interesting because of its highest yield of all the others (52.598 t/ha), the low average severity of attack on the leaves (2.8) and in the roots (2.55); the average incidence of the disease in the roots is also less than 25%.

The objective of this study was to value the effect of two organic fertilizers (dung of goat and manure of cow) on the growth parameters and yield of the three varieties of banana (musa spp) cultivated in Mulungu station.The test was conducted according to a device in split plot with three replicates. Three treatments have been valued: the dung of goat (T1), the manure of cow (T2) and a control treatment (without fertilizers) T0.The observations were about the circumference to the collar, the circumference to 1m the collar, the height of the banana trees, the number of the hands, the number of the fingers, the length of the fingers, the yield in régime. The gotten results showed that on the soil of the station of Mulungu, the banana trees dealt with 10 kg of dung of cool goat or manure of cow generated the best growths. However, the dung of goat to the same dose permit to get the best middle values of the length of the fingers 20.667cm, of outputs of 48,8 T/has is 75% during the survey.

The objective of the study was to evaluate the influence of Tithonia diversifolia in association with three hilling moments in order to identify the best moment (s) associated with Tithonia diversifolia improve soil fertility and thus give bean plants the ability to withstand the attack of bean flies and thus hope to have good yield of common beans. The experimental design was the split plot with three repetitions, with beans’ variety called Kirundo as the main plots. They were subdivided into two subplots, one of which corresponded to the application of Tithonia diversifolia and the other without Tithonia diversifolia. The main plots were nine in total and constituted six different treatments evaluated. A single fresh biomass dose of Tithonia diversifolia equivalent to 10 tons per hectare was applied in all plots with Tithonia d. two weeks before sowing beans. There were significant differences between treatments. Bean’ yield increased by an average of 212.28%, the weight of 100 seeds was improved by an average of 7.2%, the number of pupae such as the cumulative number of dead bean plants was significantly reduced by application of Tithonia diversifolia in this highly endemic study environment for bean maggot, the vigor of bean plants has been improved, there has been no interaction between Tithonia diversifolia and ridging at any given time. In conclusion, the application of Tithonia diversifolia increased bean yield in soil with many soil fertility constraints and highly endemic for bean maggot (Ophiomya spp).

The study has been initiated with the aims to evaluate effects of manure application on the yield of Irish potato. The experiment was conducted at (INERA) Mulungu using in a Complete Random Block with three replicates. Five treatments have been evaluated such as: application of DAP during planting, application of N+KCK three time as follow: once per week, once per two weeks and onceper three weeks together with a natural check without fertilizer. The results showed that DAP and N+KCL applied once per week have improved the yield up to 128.5% in comparison to the check, however N+KCL applied once per two and three weeks have increased the yield from 51.7 to 62.9% compared to the natural check. The results show that farmer having Irish as one of his activities can be interested to increase the productivity.

This work had initiated to value the influence of four (4) different techniques of plantation of the sweet potato and to identify the one or those that would improve the production of tubers while increasing the yield of production of the sweet potato. The survey has been driven according to a device of the blocks subdivided some under-parcels (split-contact) to 3 repetitions. The treatments were constituted of 4 different fashions of plantation notably, on billon, on mound, on board and to dish considered like witness. Two (2) varieties of sweet potato have been used. The results show that the yield of the sweet potato has been improved more meaningfully by the technique of billonnage until 97,4% either 14,62t / Ha against 8,8t / Ha for the buttage fluently used by most farmers. These results show that the agriculturist can adopt the technique of billonnage that is a permitting to increase the output while keeping the humidity of soil during a good period.