Millet (Pennisetum typhoides) and sorghum are used as relay crops before or after main upland crops (i.e., maize, soybean, rice). They bring a range of beneficial functions and contribute to the improvement of the soil fertility. Both species produce high amount of biomass and have strong ability to recycle high amount of potassium. This nutrient will be brought back into the soil during the decomposition and mineralization process.
Sorghum is used as a short term bio-pump cover crop for its high capacity of biomass production and drought tolerance. It could also be used after soybean broadcasting sorghum seeds mid-October when soybean leaves start to foliage. It is also known to be one of the most powerful cover crop to suppress weeds.