Water Regime in Paddy Rice Systems in Vietnam: Importance of Infiltration and Bund Flow
Nadja Reinhardt, Thomas Gut, Marc Lamers, Thilo Streck
University of Hohenheim, Inst. of Soil Science and Land Evaluation, Germany
In northern Vietnam, high population growth, resettlement programs and consequent land scarcity have led to an intensification of rice cultivation. Consequently, the amount of applied pesticides in paddy rice cultivation has tremendously increased. For paddy rice cultivation, however, there is concern that pesticides are lost from their target area possessing a serious environmental threat and contaminating surface- and groundwater. Both are used for domestic purposes. In northern Vietnam, many irrigated paddy systems include fish ponds. Especially in rural areas, fish can be considered as the main protein source for the local population. Therefore, main pathways of water losses should be identified and the significance of preferential flow for the translocation of pesticides should be analysed. Until now, water loss investigations from paddy rice fields in Northern Vietnam have not been carried out. The current study is filling this gap.
Keywords: Bund flow, northern Vietnam, preferential flow, tracer
Contact Address: Nadja Reinhardt, University of Hohenheim, Inst. of Soil Science and Land Evaluation, 70593 Stuttgart, Germany, e-mail: reinhardt.nadja.bgmail.com