J. Givi
Abstract
In addition to qualitative and quantitative land suitability evaluation, economical evaluation can be carried out as well, based on net or gross benefit per surface area unit. The present research was done to evaluate land suitability, qualitatively and economically,, by different methods for irrigated ...
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In addition to qualitative and quantitative land suitability evaluation, economical evaluation can be carried out as well, based on net or gross benefit per surface area unit. The present research was done to evaluate land suitability, qualitatively and economically,, by different methods for irrigated maize, wheat, potato and barley in Shahrekord area. In this regards, qualitative land suitability class was determined by matching land characteristics with the studied crops growth requirements, using simple limitation method and ALES program. Economical land suitability evaluation was carried out, using "internal rate of return", "gross profit", "net present value" and "benefit/cost ratio" methods which are included in the ALES program. The results showed that qualitative suitability class in all of the studied land units for irrigated maize, wheat and barley is S2 and for irrigated potato in 73% of the units is S2 and in 27% of them is S3. As the "net present value" method is used, % 73 and % 27 of the land units are classified as S2 and S1, respectively for all of the studied crops. For wheat and maize, all of the land units are classified as S1, as gross profit, benefit/cost ratio and internal rate of return methods are used. For potato and barley, using gross profit and internal rate of return methods, % 73 and % 27 of the land units are classified as S2 and S1, respectively and as the benefit/cost ratio method is used, economical land suitability class in all of the land units is S1.
J. Givi
Abstract
Optimal land utilization is important because of land degradation due to incorrect use and ever-increasing need for increasing yield per surface area unit. For this optimal use, crop specific land suitability evaluation is essential. The aim of this research was qualitative land suitability evaluation ...
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Optimal land utilization is important because of land degradation due to incorrect use and ever-increasing need for increasing yield per surface area unit. For this optimal use, crop specific land suitability evaluation is essential. The aim of this research was qualitative land suitability evaluation for maize production in Shahrekord area and validation of the applied land suitability evaluation methods. In this regards, land suitability class was determined by matching land characteristics with maize growth requirements, using parametric method and ALES program. For model making in ALES program, simple limitation method was used, a data base including soil units, land characteristics and maize growth requirements was established in the program and then land characteristics were matched with the maize growth requirements. The results showed that as the square root formula of parametric method and the ALES program are used, most of the land units are classified as S2c. As the storie formula of the parametric method is used, because of multiplication of the suitability ratings and not due to land characteristics limitations, most of the land units are classified as S3c. The most important limiting factors for irrigated maize production in the study area are average minimum temperature and mean ratio of sunshine hours to day length of the growing cycle. In some of the land units, soil pH is considered as limiting factor as well.
