Influence of Cropping Systems on Sorghum Yield in Southern Chad

A study carried out in southern Chad aimed to determine the influence of cropping systems on the yield of Sorghum (Sorghum bicolore (L.) Moench). Five villages were chosen in the Mayo-Lmi department for this study. In each chosen village, three soil samples were collected including one from a field operated for one to two consecutive years (A), a sample from a field exploited between three to four years (B) then a sample from a field exploited for at least five years (C). A total of fifteen samples were collected and the yields on each sampled plot were taken. The study shows that sorghum is produced without rotation and without restitution of nutrients; yields decrease with the duration of exploitation in all five villages. To improve the situation it would be advisable to use mineral fertilizer in combination with organic fertilizer.