Tropicultura (Jan 2018)
Réponse du sorgho aux placements profonds de différentes doses d'urée dans le système de culture de décrue à Yélimané, Mali
Abstract
Sorghum Response to Deep Placement of Different Urea Doses in the Flood Recession Cropping System in Yélimané, Mali. In order to identify the best ways of lifting nitrogen deficiency recorded in the flood recession sorghum cropping system in the district of Yélimané in Mali, a factorial experiment comparing the effect of two modes of placement (15 and 20 cm depth) and five doses of urea (0, 10, 20, 30 and 40 kg.ha-1) was carried out in a dispersed blocks design during the years 2014 and 2015. Results showed that the yields of placement mode were statistically, while equivalent there was a significant difference between yields of years and yields of doses of urea. These yields have linearly increased according to the applied urea doses. With the highest urea dose (40 kg.ha-1) sorghum produced 1,792 kg of grain/ha and 4,552 kg of straw/ha. Control yields were 959 kg of grain and 3,069 kg of straw/ha. The dose of 10 kg of urea/ha produced the best gross benefit of 3,492 CFA.kg-1 of fertilizer, the best fertilizer efficiency use of 31.6 and the highest ratio value/cost of 12.6.
