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Land suitability assessment for rice cultivation based on GIS modeling

The main objective of this study was to develop a spatial model for land suitability assessment for rice (Oryza sativa L.) cultivation using geographic information system (GIS) techniques. The land mapping units, resulting from the overlay of the selected theme layers, have unique land quality information, on which land suitability is based. | Turkish Journal of Agriculture and Forestry http://journals.tubitak.gov.tr/agriculture/ Research Article Turk J Agric For (2013) 37: 326-334 © TÜBİTAK doi:10.3906/tar-1206-51 Land suitability assessment for rice cultivation based on GIS modeling Orhan DENGİZ* Department of Soil Science and Plant Nutrition, Faculty of Agriculture, Ondokuz Mayıs University, 55139 Samsun, Turkey Received: 23.06.2012 Accepted: 07.10.2012 Published Online: 15.05.2013 Printed: 05.06.2013 Abstract: The main objective of this study was to develop a spatial model for land suitability assessment for rice (Oryza sativa L.) cultivation using geographic information system (GIS) techniques. The land mapping units, resulting from the overlay of the selected theme layers, have unique land quality information, on which land suitability is based. Results showed that 55.5% of the study area is highly or moderately suitable for rice cultivation, whereas 34% of that area is unsuitable for rice cultivation due to soil and topographic conditions. The model was also validated with field studies. According to the statistical analysis, there was a significant, positive relationship between land suitability classes and grain yields. Grain yield was significantly affected by land suitability class at the level of P 0.60 0.40–0.60 0.10–0.40 0.2 >25 >60 >0.7 0.1–0.2 10–25 30–60 0.5–0.7 SQI = R × T × D × F × Y × P × G × S × K × H Drainage (R) - Very Poor Poor Moderately good Good/excessive Texture (T) % CL, SiCL, SiL, C, SC L, SCL, SiC Si,SL, fSL G, S, LS Depth (D) cm > 50 25-50 15-25 6% Topography (F) Surface stoniness (Y) Landform and slope - >2 mm % Hard pan (P) 20–35 35–55 >55 >90 90–50 50–20 6.25 0–3.1 10 3.2–4 10–20 4.1–5 >20 >5.1 >20 % 0–5 5–15 15–20 >20 - 5.5–7.3 7.4–7.8 5.1–5.5 7.9–8.4 4.0–5.0 >8.4 <4.0 cm h Salinity hazard (S) or ESP –1 dS m–1 (%) Lime (K) 328 <20 cm Hydraulic conductivity (G) Soil reaction (H) Flood plain or Low .