The onion (Allium cepa L.) is one of the most cultivated vegetables in Niger due to its use in food and medicine. The present study, the first of its kind on the production of bulbs from bulbils, aims to compare two onion production technologies in Niger. For this, a test was set up on the CACH experimental site which is located in the Niamey IV commune. The parameters studied were the rate of plant recovery, plant growth and yield and the characteristics of the bulbs at harvest. The results showed that plant height increased over time for all treatments. The analysis shows that there are significant differences between the treatments. The average number of bulbs per plot found at the bulbil treatment level (86.33±8,430 bulbs) is significantly higher compared to that of the seedling treatment (75±5,292 bulbs); the average weight of bulbil treatment (0.98 kg) is lower than that of seedling treatment (1.16 kg); the weight of fresh biomass from seedling treatment (0.3±0.1414 kg) is greater than that of bulbils (0.25±0.2074 kg). The study noted that the yield in weight for the seedling treatment (19666.67±2.129 kg/ha) is significantly greater than that recorded for the bulbil treatment (19000±1.211 kg/ha). Both techniques have proven to be effective and can be used successively so that the onion is available and accessible all seasons of the year.

In Niger, onion production has grown but the unsuitability of fertilization techniques and application of fertilizer doses are challenges to be met in order to improve onion yield. This study aims to assess the effects of mineral (NPK) and organic (compost) fertilizers on the productivity of «violet de Galmi» onion (Allium cepa L.). The study is carried out at the Saga experimental site (Niger). The experimental design used is a completely randomized block consisting of three repetitions and six treatments including a control treatment (T0). The treatments are: T0 (300kg/ha of NPK + 20t/ha of compost); T1 (200kg/ha of NPK); T2 (100kg/kg of NPK + 20t/ha of compost); T3 (300kg/ha of NPK + 10t/ha of compounds); T4 (300kg/ha of NPK + 5t/ha of compost); T5 (300kg/ha of NPK + 15t/ha of compost). The results of the study showed that the plots having received the treatments T5, T4, T3 and T0 recorded numbers of superior bulbs respectively of 29,333 bulbs, 33.67 bulbs, 34 bulbs and 35.67 bulbs. And that the yields of biomass (5.57±1.84t/ha) and bulbs (30.00±5.00) recorded for the T0 treatments are part of the low yields recorded in the study. The dose of fertilizers in treatment T2 provided a significantly high yield (31.67±3.63). The results obtained at the end of this study show the interest in using organic matter as fertilizer in onion growing systems, in order to increase soil productivity and ensure their sustainable exploitation.

In Niger, considerable damage is recorded on seed legumes during their storage. For this, chemicals are used for the preservation of these foodstuffs. The objective of this study is to understand the use of storage insecticides against pests in Cowpea. A survey was carried out using structured sowing questionnaires with 404 producer heads of households in 16 target villages.The study shows that 91.8% of operators use insecticides for the conservation of cowpeas, mainly approved products (76%), namely Phostoxin (55.94%), Justoxin (16.58%), Rambo (0, 50%), Lamda super 2.5 EC (1.73%), Calthio (0.99%) and non-approved products (16%), namely Executor (5.20%) and Superdelvap (10.89%). This use of chemicals varies depending on the Regions (Dosso, Tillaberi, Maradi).Thus, the study also showed that 65.1% of households use phostoxin in the Dosso region compared to 29.5% and 63% respectively in the Maradi and Tillabéri regions. Up to 40% of producer households use super delvap, which is an unauthorized product to prevent damage of [Callosobruchus maculatus (Fab.)] From Cowpea at Maradi.