Nodules of Aeschynomene histrix
Local sesbania commonly observed on the paddy fields and along the roads can also be used as a cover crop after or in association with rice at a low density
A large range of legumes cover crops are preserved and seed produced every season: Sesbania sp., Centrosema pascuorum, Stylosanthes guianensis, Crotalaria sp., Dolichos lablab, Macroptilium atropurpureum, Macrotyloma axilare ..
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.
Stylosanthes guianensis (perennial legume) at the end of the dry season (May) before rolling. Stylo is used as a cover crop for maize, cassava, upland rice or soybean. Stylosanthes can be sown the same day than maize mixed with fertilizer or broadcast after first weed control operation at a rate of 4 to 6 kg/ha