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- W1983103105 abstract "Abstract Aftern an extensive literature search, CORNMOD, a comprehensive mathematical model that simulates energy and gas exchange at the plant-air interface, was developed. Predictions of profiles (CO 2 concentration, water vapour, temperature, light, photosynthesis) in the canopy were biologically good enough for many applications, but they revealed the inadequacies in our understanding of the environment within the plant canopy. Also considered were spring and fall tillage and harvest operations. After calculating several spring freeze-thaw periods for the test year, 1969 , enough work days were accumulated to complete tillage operations, allowing completion of planting by 12 May. Two 63 hp tractors and associated equipment were used to farm the 81 ha hypothetical farmstead used for test purposes. Without this large investment in equipment, planting date would have been delayed until late June or early July since the spring of 1969 was very wet. The simulated crop was grown under actual 1969 weather conditions. On 4 September the corn crop reached harvest maturity as gauged by a GDD (Growing Degree Day) ‘clock’. The simulator predicted a yield of 7368 kg/ha. This was a gross over-prediction of the 4088 kg/ha average reported for 1969 in central Missouri. This over-prediction was accounted for by the ideal conditions given the simulator when actual data were not available. This included leaf angles, CO 2 concentration, and stomatal resistance. Harvesting took 30 days to complete, using one four-row sheller, two trucks, a farm elevator, and 127 272 kg of storage capacity. It appered that the farm dryer was the limiting piece of equipment in the harvesting operation. This crop production simulator forms the basic framework that can eventually analyse more complex systems. However, at this point, the simulator is only in the initial stages of development, and it should be realised that much more extensive development is necessary before the ultimate simulator is achieved." @default.
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- W1983103105 date "1976-01-01" @default.
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- W1983103105 title "CORNMOD, a dynamic simulator of corn production" @default.
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- W1983103105 doi "https://doi.org/10.1016/0308-521x(76)90022-6" @default.
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