Land evaluation of rainfed lowland rice areas in the Mekong Delta of Vietnam
1993
Duong Van Ni
Physical land evaluation was conducted on the Rainfed Lowland Rice areas (RLRs) in the Mekong Delta of Vietnam, using the FAO (1976) framework. The RLRs were divided into physical zones (PZs), whether the soil is acid sulphate or non-acid sulphate and whether flood water is greater or less than 30 cm. The PZs were subdivided into land units (LUs) called Rainfed Lowland Rice Groups (RLRGs) based on rainfall, soil, salt water intrusion, flood water depth, inundation periods, fresh water availability and tidal action. The present land use systems (LUSs) in the whole study area were identified and described. The land use requirements (LRs) of each LUS were determined through surveys, field experiments and interviews with the farmers. The land characteristics (LCs) of each RLRG were determined by soil survey, laboratory analysis and other field surveys. Land suitability evaluation was performed by matching the LC with the LR of each LUS, from which a suitability classification for the study area was generated. Four main PZs were identified. Result of land evaluation indicate the suitability classification of the different LUSs for each RLRG. Farmers can use these results as basis for selecting alternative land use systems
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