Many weed management techniques exist everywhere on farms. However, the frequently used mechanical weeding reduces their nuisance. The combination of weeding and hoeing has multiple advantages on crop development. The objective of this research is to evaluate the effects of hoeing on the yield and profitability of eggplant cultivation in the off-season. Four hoeing frequencies (F0, F1, F2 and F3) have been tested. After transplantation into a Randomized Complete Block, the frequencies were implemented with a localized watering system. At harvest, biometric parameters, fruit marketing, profitability and their components were evaluated and subjected to statistical calculations. The main results showed from an agronomic point of view that the watering frequencies did not influence the length of the fruits and the number of fruits per plant. Thus, the F3 frequency gave the best yield with 20.36 t/ha on the two harvests. However, the baton turned out to be better from an economic point of view with a profitability of 326.75%. Controlling weeds on eggplant crops in the off-season by hoeing gradually reduces its profitability. Its cultivation without hoeing during this period, with localized irrigation, can promote the conservation of soil moisture for good plant nutrition on a permanent basis and a reduction in the pressure of unwanted weeds.

The study examines the impact of glyphosate doses on the chemical characteristics of soils in four rural communes of the N’Zérékoré Prefecture in Guinea. The objective is to analyze the variations in pH, cation exchange capacity (CEC), and nutrient levels (K2O, P2O5, CaO, and Na2O) following the application of different glyphosate doses. A complete randomized block design was used, and soil samples were analyzed to determine the agronomic and environmental impacts of this herbicide. The results indicate that the application of high doses of glyphosate significantly affects the pH and CEC, leading to soil acidification and a reduction in its ability to retain nutrients. These observations highlight the importance of managing glyphosate doses to maintain soil health and the sustainability of agricultural practices.