On the clay soils of the Irrawaddi delta, a considerable amount of water can be conserved for growing a second crop after rice, provided that the fields are ploughed while still wet, immediately after the harvest. Estimated yields of cowpeas (Vigna sinensis) grown after rice, based on evapo-transpiration data, are 330 kg. seed/ha., and for Sorghum spp. about 4000 kg. dry matter/ha.