Collection of Job’s tears (Coix lacryma Jobi) in the Bos Khnor experimental station (Chamcarleu district, Kampong Cham province)
Finger millet (Eleusine coracana) is an annual crop that can be used for the grain (high nutritive value higher than rice, maize, sorghum), fodder source and as a cover/relay crop. Strong fibrous rooting systems, high decompaction ability, symbiosis with free-N fixing bacteria.
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.
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.
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.