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Assessment of Different Methods of Soil Suitability Classification for Wheat Cultivation

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Assessment of Different Methods of Soil Suitability Classification for Wheat Cultivation J Agrobiol 29(2): 47–54, 2012 Journal of DOI 10.2478/v10146-012-0008-0 ISSN 1803-4403 (printed) AGROBIOLOGY ISSN 1804-2686 (on-line) http://joa.zf.jcu.cz; http://versita.com/science/agriculture/joa ORIGINAL ARTICLE Assessment of different methods of soil suitability classification for wheat cultivation Amin Sharififar Faculty of Agriculture, Shahrood University of Technology, Shahrood, Iran Received: 24th November 2012 Revised: 1st April 2013 Published online: 31st October 2013 Abstract This study investigated the impact of soil temperature and soil moisture on the virulence To protect soil resources and also to achieve optimal crop production, it is essential to dedicate the most suitable land to a specific land use. Achieving this goal is possible through land use planning in conjunction with land evaluation. In this study a land suitability evaluation was carried out for wheat (Triticum aestivum) cultivation, and was performed in the Bastam region located in the north east of Iran. 104 soil profiles were sampled and 11 land units were separated. In order to find out the most correct method of physical land suitability evaluation, three methods of combining soil criteria for soil index calculation for wheat production were tested. These methods are based on parametric and maximum limitation approaches, and the results of each method were compared with the observed yield. Ultimately, the maximum limitation method was found to be the best method and was used for classification of the suitability of the study area lands for wheat cultivation. The varying results of applying different ways of evaluation in this study indicate that the accuracy of the method of land evaluation adopted should be checked before using the results for any purposes. Key words: Almagra model; Bastam; land evaluation; MicroLEIS; soil index INTRODUCTION vital for wise planning of land use. Before making any decisions about dedicating lands for any Scientific recognition of land resources and agricultural uses, land suitability evaluations possible land exploitations, as well as interactions should be implemented. Technically each land between specific land units with a specific use, is unit should be used for an application which is suitable for that application (FAO 1978). Suitable land use planning paves the way for sustainable development. Amin Sharififar, Faculty of Agriculture, Land evaluation makes it possible to use lands Shahrood University of Technology, Shahrood, according to their biophysical potentialities and 36199-95161, Iran limitations, in order to protect soil resources [email protected] from degradation and at the same time to meet farmers’ demands for optimal crop production. 47 Journal of Agrobiology, 29(2): 47–54, 2012 If there is a significant correlation between varied from 1350 to 1900 m above sea level but predicted yield and observed yield, then the elevated lands are not cultivated and the altitude results of the evaluation method would be of agricultural lands does not vary significantly. accurate and can be applied for land suitability The total area surface was about 53,500 ha. Slope classification and management. Two general gradient varied from flat to 8%. The physiography methods of land evaluation have been presented of the studied land units included: Gravelly by Sys et al. (1991b). Those methods are the Alluvio-Colluvial Fans, Pidmont Plateax and maximum limitation method and parametric Alluvial Plains. According to the bioclimatic map method. The so-called Almagra model (found in of the region (FAO 1988), the study area possesses the MicroLEIS software) which is based on the an attenuated sub-desert climate. Major land maximum limitation method for land suitability uses of the study area are agricultural, pasture assessment, is applied in this study. and fallow lands. As wheat is a strategic crop in MicroLEIS DSS (Decision Support System) many countries including the study area and also software, containing the Almagra model was built most of the farmers dedicate a high surface area in the Mediterranean climate (De la Rosa et al. of the region studied to wheat cultivation each 2004) and has been recalibrated and revalidated year, this crop was selected for evaluation to be in semi-arid regions in west Asia (Shahbazi et al. tested for soil suitability evaluation. 2009). Some case studies have used the Almagra model for land suitability evaluation (Darwish et Soil sampling and analysis al. 2006, Wahba et al. 2007, Shahbazi et al. 2008, In total, 104 soil profiles were investigated and 2009, Jafarzadeh et al. 2009) but unfortunately among those, eleven representative profiles researchers in such case studies have not were selected. Therefore 11 representative land investigated their method in comparison with mapping units, taxonomically classified to the other existing methods to find out whether the family level, were separated. The procedure of method that was used is the correct one. Models taxonomic land classification was adopted from like Almagra need to be validated when they are the soil taxonomy manual of the United States used in areas other than those for which the model Department of Agriculture (USDA 2010). This was calibrated and validated. The evaluation classification is based on field surveys and methods discussed in this paper have been used in morphological descriptions such as leaching other regions but most of those researchers have evidence, the position of soil horizons and their tested only one method of evaluation and did not depth, and chemical and physical analyses compare the results of different methods for land such as: electrical conductivity, organic carbon, evaluation. Some of them have not investigated exchangeable sodium percentage, cation the correlation of predicted results with the real exchange capacity, carbonate content, texture, observed yield of the crop. The objective of this structure, etc. These analyses were carried out study is to select the most correct land evaluation using standard methods of soil analysis in the method and then determine the suitability of laboratory. Land unit separation was carried land units for wheat cultivation. out by field investigations. Some climatic data, including temperature and precipitation rates were also used in the taxonomic land MATERIALS AND METHODS classification, which also showed Aridisols and Entisols as dominant soil classes in the Study area description region. Soil moisture regimes were Aridic and This study was performed in the Bastam region Torric, and the thermal regime was Mesic. The in the Semnan province located in the north east geographical position of the land mapping units of Iran. The study sites were located between (soil families) of the region is shown in Fig. 1 coordinates 54° 39′ to 55° 20′ of east longitude and the measured site characteristics are shown and 36° 26′ to 36° 45′ of north latitude. Altitude in Table 1. 48 Journal of Agrobiology, 29(2): 47–54, 2012 Table 1. Mean values of land characteristics of the study area Land units Texture1 Electrical Carbonate ESP2 Rooting pH Drainage Stoniness class conductivity content % depth (cm) class % (ds/m) Abr Sandy Loam 0.4 31 2.7 95 7.8 Good 15–35 Amir Clay Loam 1.7 23.7 3.1 145 7.9 Moderate <15 Bagh Loamy Sand 1.0 5.5 2.8 22 7.9 Good 30–75 Bastamy Loam 1.7 28.5 6.3 160 7.8 Moderate <15 Bayazid Loamy Sand 1 14.7 4.1 95 8.0 Good 15–35 Kharaqan Silty Clay 6.8 55.8 13.2 125 7.8 Moderate <15 Khazaneh Sandy Loam 0.5 24.0 2 40 7.9 Good 15–35 Khij Sandy Loam 1.7 36.0 1 86 7.8 Good 10–25 Mojen Silty Loam 0.8 41.5 2.6 150 8.0 Moderate <15 Qaleh Silty Clay 2.7 30.2 5.8 150 8.0 Moderate <15 Loam Qehej Sandy Loam 0.7 20 1 140 8 Good 46 1 Texture classes as well as all other parameters values are mean values of the soil profile horizons, according to the instructions in Sys et al. (1993) 2 Exchangable Sodium Percentage of soil Evaluation procedure given to each criterion. The total score for a In this study three ways of determining the total special land unit is also given a rate of 0 to 100 by ranking of every specific land unit are applied calculation through the three methods discussed and their outcomes are compared with soil in this paper as ways of combining the criteria productivity. The three methods, explained by Sys scores. The procedure of the maximum limitation et al (1991a), are the Storie method, the square method is the the selection of the most restricting root method (Khiddir 1986) and the maximum criterion rate and considering it as the total score limitation method. The Storie method and the for a land unit. square root method can both be subsumed under The wheat yield data in each land unit were the rubric of parametric methods. The equation used as indicators of soil potentiality which in (1) and (2) show the Storie and square root turn indicates soil productivity. However, the methods respectively. yield is not dependent only on soil and land characteristics but could also be influenced by SI = (A) × (B/100) × (C/100) × … (1) managerial factors and other factors such as diseases, which have not been considered in the SI: Storie index land evaluation. However, after interviews with A, B, C: ratings of criteria the farmers of the region, managerial differences among land units of the region were seen as I = (Rmin) × √A/100 × √B/100 ×… (2) unimportant, and therefore the soil productivity potentiality level can be distinguished using crop I: index of square root method yield. Rmin: the minimum rated criterion A, B, … : criteria other than minimum rated Crop potential yield criterion To compare the predicted soil suitability (potentiality) for wheat growth with the actual The rate for each criterion is obtained yield, the score (called the soil index) of each after field or laboratory measurements of the land unit, having been calculated using three land properties, and the comparison of these methods, is multiplied by the crop potential yield, measurements with the crop requirements in the and the outcome is compared with the observed reference tables.
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