Wednesday, November 15, 2006

Paddy-Upland Rotational Cropping and Restoration Management in Fallow Farmland.

Ho Lee1, Su-Jin Ahn2, Soo-Kyung Lee2, and Ji-Hoon Jung2. (1) College of Agriculture and Life Sciences, Dept. of Agronomy, Seoul, 151-742, South Korea, (2) Dept. of Agronomy, "Coll. of Agric. And Life Sci., Nati", "Coll. of Agric. And Life Sci., Nati", Seoul, 151-742, SOUTH KOREA

Korean paddy rice has been overproduced with adapting high-yielding technique of rice culture and oversupplied as the reduction of rice consumption. The occurrence of idle land of paddy field has became a serious issue in recent years. Since most rice paddy was located at the low and flat land, most upland crops sawn in paddy have water-logging damage by poor drainage during heavy rainfall in summer monsoon season. This research was an investigation on the vegetation succession and change of soil property after following fallow and the possible alternative cropping instead of rice farming as well as the restoration to rice paddy field. In first year of fallowing paddy, annual weed was dominant species but, replaced to perennial plants after second year of fallow. The CEC level and nitrate-N concentration and soil organic matter content were increased after fallowing of paddy field. Soil water content was increased more than 40% during rainy season. The restoration to paddy decreased nitrate-N concentration and soil organic matter content. The cropping systems such as soybean barley, sorghum x sudangrass hybrid rye, buckwheat canola rotation were tested in fallow paddy.