GIS-based land suitability evaluation for rapeseed oil crop
2009
Pirbalouti, Abdollah Ghasemi
The potential of land for agronomy and horticulture use is determined by an evaluation of biophysical variables. The climate, soil and geomorphologic environmental components are important agro-ecological variables. Evaluation of biophysical variables is usually a first step in land use analysis. Geographic Information System (GIS) was used to identify suitable areas for rapeseed crop production in Isfahan and Chahar Mahaal va Bakhtiari provinces, Iran. Relevant environment components such as climate (precipitation, temperature, humidity, etc.), soil (chemical and physical characteristics including texture, gravel percentage, pH, EC, soil depth, etc.), agronomic management (sowing method and date, soil fertilization, irrigation, weed and pest control, etc.) and topography (DEM) at different spatial and temporal resolutions were considered. In general, the results of overlay maps for biophysical (climate, geomorphology, soil and agronomy variables) suitability evaluation using simple limitation approach (SLA) indentified 0.003% (0.12 km2), 22% (8398 km2), 15% (5494 km2) and 63% (23,762.5 km2) of the land surface area highly suitable (S1), moderately suitable (S2), marginally suitable (S3) and not suitable (N) in the study area, respectively. The main limiting factors are the geomorphology (slope and elevation), climate (freezing days, GDD and precipitation), soil (OC%) and agronomic management (sowing date, irrigation and weed control) characteristics in study areas.
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