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The purpose of this studies was to determine land suitability field crops including wheat, barley, triticale, cotton, sugar beet, sunflower, rapeseed, potato, tomato, watermelon, cucumber, melon, alfalfa, forage maize and horticultural Apple, plum, peach, apricot, grape, cherry, and cherry, saffron, barberry using parametric method for the range of North, South and Razavi Khorasan province.Based on climatic results, wheat, onion and sugar beet were studied in North Khorasan province, barley and sugar beet in Khorasan province, South Khorasan barley, wheat, melon, watermelon and triticale had no limitation on the climate in the studied areas. Other crops are mainly climatically constrained, mainly due to the average temperature constraint at different stages of the growth cycle. Orchard crops in these provinces often have limitation moderate temperature restrictions and in some cases relative humidity in the growth or flowering, pollination and fertilization stages.According to the results, in North Khorasan Province crops, in the most suitable proportion (S1) sugar beet with an area of 25,000 hectares, the relatively suitable proportion (S2) of barley with an area of 41,000 hectares, cotton in the critical proportion class (S3) of 48 hectares. Thousands of hectares, in the present condition (N1) onions with an area of 25,000 and in the present and future conditions (N2) of tomatoes with an area of 22,000 hectares were the highest. Khorasan Razavi Province Crops, Highly Appropriate (S1) and Moderately Appropriate (S2), Sugar Beet with Area of 109000 and 82,000 Hectares, Cucumber in Critical Fit Class (S3) of 172,000 Hectares, Inappropriate Class in Current conditions (N1) and current and future conditions (N2) have the highest level of potato with an area of 82 and 72000 hectares. South Khorasan Province, High Suitability Class (S1) Wheat with 4818 acres and Relatively Suitable Suitability (S2), Barley with 7629 ha, Safflower in Critical Suitability Class (S3), 7312 ha, in Inappropriate Class Under Current Conditions (N1 Sugar beet is 8826 hectares and the current and future conditions (N2) of alfalfa have an area of 7860 hectares. Also in North Khorasan horticultural crops in relatively suitable class (S2), grapes with an area of 27,000 hectares respectively, cherry in critical fitness class (S3) with an area of 34,000 hectares, inappropriate class with current conditions (N1) grapes with 14 A thousand hectares and in unsuitable class in the current and future conditions (N2) have apples with 32,000 hectares. In Khorasan-e-Razavi province, a very suitable (S1) class of apples with an area of 7793 hectares, a relatively suitable class (S2) of grapes with an area of 109,000 hectares respectively, saffron in a critical proportion class (S3) of 210,000 hectares. Inappropriate class in present condition (N1) have apples with an area of 60,000 hectares and in inappropriate class in present and future conditions (N2) have pistachios with 75,000 hectares. Also in South Khorasan province, Grape Suitable Class (S1) Grapes with 1296 hectares, Relatively Suitable Grade (S2), Pomegranates with 4818 hectares, Saffron in Critical Suitability Class (S3) with 7731 hectares, in class Inappropriate in current conditions (N1) grapes with an area of 2811 hectares and in inappropriate conditions in present and future conditions (N2) of pistachios with 8760 thousand hectares have the highest level of land under study. The most important limiting properties for most crops in the North Khorasan province are soil, texture, acidity, salinity and alkalinity. In Khorasan Razavi lands, soil texture and soil acidity and soil acidity and in southern Khorasan lands, soil texture and structure are. The most important limiting properties for most crops in the North Khorasan Province are soil, texture, acidity, salinity and alkalinity. In Khorasan Razavi lands, soil texture and soil structure and acidity are in slope, soil texture and soil structure in South Khorasan.Keywords: Field and orchard crops ,Khorasan province, Land suitability classification, Parametric method.
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