The subject of the paper are linked processes in agriculture. Sophisticated relations between operational and transportation farm practises in time, place, and mass balance need compound simulation based on computer software. Important prerequisites for a good solution is a well-founded land management project. The last one have to include at least proper crop rotation plan and corresponding road net. The different combinations of crop yield, bulk density, distant of transportation for distinct plants require many concrete solutions. Furthermore, transportation can be realized with or without intermediate capacity like buffers, bins, overloader trailers, exchangeable trailers, etc. For fastets harvest, computation are made with maximum number of selfpropeler harvesters or enough to end of crop gather in acceptable periods. In the example, a joint work of Claas Lexion 600 and tractor with 9, 12 and/or 21 tons carrying capacity of trailer are discussed. For easy choice of every concrete solution, additiobnal information can be used like linked processes performans and graphic illustration. The proposed optimal procedure garatees enough data for reasonable solution based on real combinations of technology, machinery, vehicles, intermediate and final capacities.