الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
Objectives: A general purpose simulation program has been developed to help researchers and manufacturers for the optimisation of farm machinery operations in wheat field in Egypt. The program was written in Visual basic 6.0 programming language and considered as an aid to decision making for optimizing and improving the performance of different tractor–implement combinations systems specifically for wheat, sowing, and harvesting operations. Methods and Results: The developed program was validated with the databases collected for the specifications of three seed bed preparation implements, three planting machinery techniques, and three wheat harvesting methods as they are operating under different operating parameters operating conditions, sowing date, and farm size. To support the decision making, the user specify the limits of the input variables through the intuitive user interfaces that linking databases such as implement-tractor specifications, and operating parameters, and conditions. Thus the model allows the option of calculating all expected machinery performances, and machinery costs involving fixed and variable costs and including timeliness costs for a particular sowing date and farm size. The output from the program is the time and fuel consumption required for performing each operation. The effective work rates and field efficiency of the machinery set assassinated with each operation are also included in the program. In general the developed program is capable for choosing the optimal machine type and size as well as the proper tractor power size. It is also used to predict the optimum field operating parameters (speed, time of operation and machine type) of a selected tractor-implement system that result in minimum wheat machinery costs with low consumed energy. Conclusion : The developed simulation program revealed that:- * The net profit due wheat transplanting at late time is greater by 40-50 % than net profit from wheat drilling and manual broadcasting methods as planting at the recommended time. * The average total costs of the planting systems were (151.4), (161.41) and (186.61 LE/fed.) for the manual broadcasting, the seed drill, and transplanter respectively. * The average values of timeliness costs (crop losses for a particular sowing date) were about 411.26 176.60 LE/fed and 427.35 234.17 LE/fed assassinated to a crop being established too early (down to 20 October) and too late (from 15 December) respectively. * The estimated rate of energy consumption was (41.779 kWh/fed) as using seed drill for planting wheat while, it was 35.142 kWh/ fed for using transplanter machine. The lowest energy consumed rate was (0.171 kWh/ fed) as sowing wheat manually.