Nodules of Aeschynomene histrix
Seed of sunnhemp (Crotalaria juncea) is produced on the Bos Khnor Station (Chamcarleu district, Kampong Cham province). Sunnhemp is sown in association with others cover/relay crops as millet, sorghum, finger millet (Eleusine coracana) among others. As a legume, the sunnhemp develops a mutualistic relationship with rhizobacteria. This specie is also useful to decrease the abundance of plant-parasitic nematode and to decompact the soil through a strong and deep tap root system.
Sunnhemp (Crotalaria juncea) is a short-term bio-pump cover crop prior the main crops. It is used for to improve soil macro-porosity, to suppress plant-parasitic nematode, to fix N, among others functions.
Pigeon pea (Cajanus canjan) is one of the most suitable cover crops to ecological intensify the hybrid Corn cultivation on Mollisols under CA management. To avoid possible competition, Pigeon pea is sown 15 days after sowing the Corn. After harvesting the Corn in November, the Pigeon pea continues to grow crossing the dry season to suppress the weeds and improve the soil. The grain could be harvested for sale or animal feed.