Soybean is cropped under a two years rotational sequence with maize. Sorghum is broadcasted when the soybean leaves start to foliage around mid-October. This drought tolerant specie stay alive during the dry season and restart growing with the first rains. High biomass production of sorghum (> 15 tons of dry matter/ha) can be reached under such condition. His strong root system, ability to recycle K and to control weeds (allelopathic effect) makes this specie of first interest to enhance biological interactions. In addition, the sorghum could be harvested for grain and fodder source.
Sorghum mixed with sunn hemp are used as cover crops after soybean. This mix is broadcasted when soybean start losing leaves in mid-October. These cover crops resist very well to drought and could cross the dry season. They restart growing fast with first rain falls in the following year. Sorghum could be harvested for grain and forage.