الفهرس 
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Abstract
Introduction: (3 pages)The introduction dealt with the subject of the research and the justifications and importance of the implementation of this research and the purpose of its implementation.2 - Reference studies: (40 pages, 55 references foreign and local)The study included equations and theories for the management and operation of agricultural equipment, especially the price equations for the purchase of tractors and agricultural equipment, the price increase index in the eighteenth of the year, and the mathematical models for calculating the cost of operating the annual farm equipment.- Materials and methods used: (21 pages - 1 format and pictures - 3 tables) A) Data on the purchase prices and operating costs of agricultural equipment were collected over 10 years from 2007 to 2017 from the agricultural engineering stations (Al-Mahalla Al-Kubra -Sakha (Mubarak Center) -Met Al-Deeba- Sinbillawin- Aga-Belqas) - Periodicals of the Ministry of Agriculture and the Central Auditing Organization. B) Data collected using Stats were analyzed to find the different subsidy parameters for the purchase price of 3 types of agricultural tractors (2-Wd, 4-unEq WD and 4-Eq and 7 types of agricultural equipment) Harvesting machines and drills.. Results: (page 33-19 format and curve-10 table):The researcher discussed the results obtained in two stages: Phase I: Study the equations of prediction of the purchase and analysis of tractors and agricultural equipment in previous studies and the use of data collected for these equipment and reconstructing these equations to predict the purchase price of three types of agricultural tractors (2-WD, 4-UnEq WD and 4 Equal WD tractors) Agricultural machines are plows, dredgers, dredgers, rotators, disk harrows, sowing machines, sowing machines, and Combine machines. It was found that the tractor purchase equation is a function of the capacity of the rear management column. While the tillage equipment was equivalent to purchased as a function in the number of crates, weapons, machine width, agricultural equipment, number of machine units, machine width, and disk combs, the equivalent of the purchase was found as a function in the number of disks, machine width and machine weight. The second phase deals with the latest equations for calculating the costs of operating agricultural equipment for former researchers such as maintenance, machine sale, installment, insurance and interest on capital to find the annual costs of operating agricultural equipment by applying three levels of tax and interest inflation without applying inflation to agricultural equipment. Different segments were found to have lower annual costs than without increasing the replacement point of the farm. The mathematical model is a simple way of calculating the annual costs of operating agricultural equipment 5 Abstracts: The thesis contained two abstracts, one of them in Arabic (4 pages) and the last in English (4 pages), in which the researcher highlighted the most important results obtained. 6. References: (number of pages 55-6 pages) The chapters of the thesis contain many references 55 which contain many different factors that are directly related to the coverage of the aspects of the research and are characterized by their history and the consistency of what has been done in this field. 7. Annexes: (3 Annexes A, B and C in 26 pages) Including the tables of statistical analysis of some of the sports relations of tractors and agricultural machinery and the results of application of the mathematical model without and the application of different segments of inflation and find the annual costs of operating agricultural equipment.