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.