Land suitability evaluation and production potential for wheat in Gypsiferous soils of Esfahan, Fars and kermsn provinces
2007
Seyyed jalali, A`li Reza | Zare`iyan, Gholam Reza | Sa`adat Mand, Gholam Reza | Zeyn Ol-Dini, A`li
With regard to distribution of gypsyferous soils in country and importance of using these soils, knowing land suitability and potential of wheat in a necessity. So, this research was performed in in provinces of Fars, Esfehan and keman.Iran.One of the important aim of this study is adaptiing gypsum requirement for wheat in crop requirement tables for country. This research was done in provinces of Fars, Esfehan and keman. In this study land suitability classification was performed using parametric method , square root method. Then biomass production was estimated using Fao crop growth model. The result in Fars provice, Sapidan and Baiza area showed producion potential for wheat is 11027 kg/ha. Land production potential for wheat is from 1000 to 7000 kg/ha which reduction in yield is due to flooding, soil limitation such as carbonare calcium, gypsum limitations, gypsum, salinity and alkalinity, pH and farm management. The result in Efahan Provice shows variation in yield in soils with diferent gypsum, the lowest yield is 1563 kg/ha and highest is 4445 kg/ha. The result in Kerman provice, showed that that the main limitations are gypsum, testure and structure. Producion potential for wheat is 7182 kg/ha. Land production potential for wheat is from 760 to 6157 kg/ha. Farmer wheat yield is from 1450 to 5850 kg/ha with mean yield 3500 and maximum yield 6000 kg/ha. For looking to effect of gypsum on yield Based on national results 61 farms were selected in Fars, Esfehan and Kerman provinces, the regression line between gypsum based on lab analysis and wheat production showed moderately good correlation with regression coeficent 0.24. Regrssion based on curve estimation, linear, cubic, exponential mehods showed regression coeficient 0.29. which base on these reults lands with 0-5 percent gypsum was set to S1(highly suitable), lands with 5-15 percent gypsum was set to S2 (moderately suitable), lands with 15-35 percent gypsum was set to S3 (marginally suitable) and lands with more than 35 percent lime was set to N (none suitable). Even if these rating is offered for gypsum , but the result in lab shows lower value regard to field observation gypsum. So it seemed that tolerance of wheat to gypsum is higher based on field observation than lab test in Esfahan province.
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