02 Contents Frame
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40 2019 ND-CP 413905
| Six principles
i. Land suitability is assessed and classified with respect to specified kinds of use. Different kinds of land use may have different requirements. The concept of land suitability is meaningful only in terms of specific kinds of land use, each with their own requirements, e.g. for temperature regime, soil moisture or rooting depth. The land itself and the land use are equally fundamental to land suitability evaluation. A broad definition of land is employed that extends beyond soil or physical resource base. Likewise land use includes the broader context of the production system and its biophysical and socio-economic environment. ii. Evaluation requires a comparison of the benefits obtained and the inputs needed on different types of land in order to assess its productive potential. Land in itself, without inputs, rarely has productive potential: even the collection of wild fruits, for example, requires input of labour. Suitability for each use is assessed by comparing the required inputs, such as labour, plant nutrients or road construction, with the produce or benefits obtained. iii. The evaluation process requires a multi-disciplinary approach, i.e. the involvement of a range of specialists from the fields of natural science, the technology of land use, economics and sociology. In qualitative evaluation, Chapter 2 – Historical development 7 economics may be employed in general terms only, without calculation of costs and returns. In quantitative evaluation the comparison of benefits and inputs in economic terms plays a major part in the determination of suitability. The different specialists may work in a team or successively (parallel or two-stage approach). iv. Evaluations should be in terms of the biophysical, economic, social and political tải về 0.57 Mb. Chia sẻ với bạn bè của bạn:
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