Phkar Rumdoul is sown directly into the mulch of Stylosanthes guianensis and Centrosema pascuorum without soil tillage and puddling. The field is located on the upper part of the Stung Chinit irrigation scheme (80% sand, less than 1% of organic matter in 0-10 cm depth) with limited water accessibility. This system reduces soil evaporation, decreases soil surface temperature, increases soil organic C and N contents, allowing for better water and nutrients use efficiency and profitability.
Stylosanthes guianensis (perennial legume) at the end of the dry season (May) before rolling. Stylo is used as a cover crop for wet season rice on sandy podzolic soil (80% sand) of Stung Chinit irrigation scheme (Kampong Thom province). After 4 years, the use of high and diversified biomass-C inputs allows an increase of the soil fertility (soil organic C & N, soil biological activity and improvement of soil properties)
Centro is one of the most suitable cover crops for rain-fed lowland rice. It is highly tolerant to acidic sandy soils, easy to establish broadcasting once the water recede to 1-2 cm. Centro could be one of the favorite cover crop under organic management due to its susceptibility to mechanical rolling. High seed production is observed.
After 3 years demonstration, the farmers around the demonstration plot start to convince that innovative CA techniques could restore the soil fertility and increase the rice (Phkar Rumdoul) productivity. They are impressed with the benefits of Stylo to not improve the soil, but also high nutritious fodder for cattle and buffalo
There are more interests from donors and development agency on the CA. The French Development Agency has been long time supported the CA R&D program and wish to upscale the CA on rain-fed lowland rice in Cambodia.