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This study was aimed to use the fuzzy logic to employ complex and non-simple models to simple and understandable models that are concerned with no accuracy in the event or the concept itself in the GIS environmental to produce soil degradation maps of the chemical degradation for lands by spatial interpolation method (Inverse Distant Weight). The study area was selected in the province of Babil and within the large Musaaib project. Forty (40) surface samples and 12 profiles were drilled (soil profile). The chemical properties of the soil were then estimated. The results indicated that there were four types of chemical deterioration of the soil, which was characterized by a slight degradation of D1 with an area estimated at 1982.34ha, second class D2 represents the moderate degradation which occupies an area of 1074.71ha while the third class Severe degradation D3 area is estimated at 2403.18hectares, while the fourth class very severe degradation D4 area of 2830.56hectares. Keyword: IDW, unsupervised classification, reclassification,soil profile. *Part of M.Sc. thesis of the 1 st author ةيقارعلا ةيعارزلا مولعلا ةلجم 2020 : 51 ) )صاخ ددع : 53 60 دمحو يريدبلا بيسملا عورشم برتل يئايميكلا روهدتلا مييقت لامعتساب ةيفارغجلا تامولعملا مظن يف ببضملا قطنملا * يريدبلا ةداسلا دبع ركاش انر **دمح ميها ربإ روفغلا دبع ةثحاب دعاسم ذاتسا دادغب ةعماج/ةيعا رزلا ةسدنهلا مولع ةيلك**رحصتلا ةحفاكم مسق ,*ةيئاملا دراوملاو ةبرتلا مولع مسق صــلختسملا ببضملا قطنملا مادختسلا ةسا ردلا تهجتا فيظوتل ةدقعملا جذامنلا ةطيسبلا ريغ ىلإ جذامن ةموهفمو ةطيسب ت اب مته ل ةقدلا هسفن موهفملا وأ ثدحلا يف يف ل ةيفا رغجلا تامولعملا مظن ةئيب يئايميكلا روهدتلا يف ةلخادلا برتلا تافص طئا رخ جاتن ل لامكتسلاا ةقيرطب يضا رلأ . عقاوب تانيعلا ذخا مت .ريبكلا بيسملا عورشم نمضو لباب ةظفاحم يف ةسا ردلا ةقطنم تريتخا 40 رفح متو ةيحطس ةنيع 12 ( ليافورب افصلا تردق اهدعبو )ةبرت دقم ت ةسا ردلا ةقطنم برتل ةيئايميكلا ىلإ جئاتنلا تراشأ امك . فيفخروهدت فنصلاب تلثمت يضا رلأل يئايميكلا روهدتلا نم فانصأ ةعبرأ دوجو D1 ب ردقت ةحاسمب 1982.34 امأ راتكه يناثلا فنصلا D2 ب ردقت ةحاسم لغشي يذلا طسوتملا روهدتلاب لثمت 1523.91 ثلاثلا فنصلا لغش نيح يف راتكه ت ديدش روهد D3 ب ردقت ةحاسم 2403.18 ادج ديدش روهدت عبا رلا فنصلا لغش نيح يف راتكه D4 ب ردقت ةحاسم 2830.56 راتكه . ةفاسملا سوكعم ةقيرط :ةيحاتفملا تاملكلا ،هجوملا ريغ فينصتلا ، .فينصتلا ةداعإ لولا ثحابلا ةلاسر نم لتسم ثحبلا* *Received:17/4/2019, Accepted:8/7/2019 Iraqi Journal of Agricultural Sciences –2020:51(Special Issue):53-60 Abdulsada & Hamad 54 INTRODUCTION Our population in the world is steadily increasing to 9.5 billion in 2050, natural and human induced soil degradation, if not mitigated, will undoubtedly increase the potential for negative impacts such as disease and malnutrition (17). Land degradation is often caused by human activities, and exacerbated by natural processes such as climate change Some 25% of the global arable land surface is considered to be degraded; every year, approximately 12 million hectares are added to the total area of degraded land(20). Land degradation refers to the reduction of the biological or economic productivity and complexity of land (18). This means reduced food production, water storage, biodiversity and carbon sequestered in soils and vegetation (6). Dry land salinity is a major form of land degradation. The country suffers severely due to land degradation and desertification problems, especially in its central and southern parts of Iraq (9).Chemical soil degradation after erosion is the second most abundant form of soil degradation and as such poses a threat to our finite soil resource, as it tends to render it less usable. It is therefore necessary to understand the means by which soils are degraded chemically(14). (8) indicated that soil salinity increases with sodium adsorption rate and the Exchangeable sodium exchange, as their increase leads to saline degradation. Gypsiferous soils can readily be classified as highly sensitive to environmental conditions such as salts accumulation on the soil surface (1). The ecosystem in saline soils is not only affected by the concentration of soluble salts but by the content of soluble and exchangeable sodium(5). Cluster a dominated at the middle of iraq due to the deposition of the Tigris and the Euphrates river sediments in the direction normal to its flow path (2).GIS (geographic information system) is a special case of information systems that contains databases based on the study of the spatial distribution of events, activities and targets that can be identified in the spatial environment such as points, lines or spaces. The processes information related to these points, lines or spaces to make data Ready to be retrieved for analysis or query through data (7).(3) used Inverse distant weight to produce 3D mapping for the variables of some soil physical properties by using spatial statistic. (16) assessed the suitability of wheat, barley and maize crops in Iran using GIS to demonstrate crop suitability requirements as well as soil characteristics using maps to increase accuracy. (10) used one of the methods of spatial prediction by geographic information systems with some chemical and physical soil properties in the soil texture, salinity, calcium carbonate, gypsum and ESP, and produced it using a map system to serve the research and application work in southern Iraq, while (15) used one of the methods of spatial completion by geographic information systems to determine the spatial distribution pattern of soil isolates after numerical analysis numbering by Ward method (4) showed ability of spectral reflectance to detecting the Aridisols and Entisols orders and can be also detecting sub group at TypicHaplogypsids and TypicHaplosalids taxonomy units appeared to be distinguished andisolated. While there were difficult to detecting and identification between VerticTorrifluvents and TypicTorrifluvents in the lower of resent Mesopotamian plain of Euphrates river.Spatial logic is a mathematical process and a logical system depends on the generalization of traditional bivalent logic, in order to mysterious circumstances. In a narrow sense, the theories and techniques that use misty groups are infinite sets of boundariesThis logic is an easy way to describe and represent human experience,It also provides practical solutions to real problems, which are solutions at a cost effective and reasonable, compared to other solutions that offer other technologies and is converted from the classical logic expressed by mistake or right and the number one or zero to become a multi-value zero-toone fuzzy logic and the transition from Classical Mathematics and numbers into Philosophical and Linguistic Mathematics This logic represents a way to describe and represent human experience and provides practical solutions to real problems (19). The land suitability for crop cultivation can be analyzed using multiple evaluation criteria in the GIS environment(13). While (11) used the fuzzy logic of producing suitable mapsfor land Iraqi Journal of Agricultural Sciences –2020:51(Special Issue):53-60 Abdulsada & Hamad 55 in southern Iraq.The type of cluster distribution pattern for some soil attributes may be due to the effect of pedogenic processes and to some extent to geomorphic processes, and landscape position(12). MATERIALS AND METHODS

EVALUATION OF CHEMICAL SOIL DEGRADATION IN THE MUSYAB PROJECT USING OF THE FUZZY LOGIC IN GEOGRAPHIC INFORMATION SYSTEM