The objective of this study was to theoretically investigate the factors affecting kernels during picking up and\r\ntransporting stage using a pneumatic precision metering device designed especially for wheat precision seeding and correlates\r\nfindings with the results from practical testing under laboratory conditions using a test stand with camera system. The results\r\nfrom dynamic analysis were found to be corresponding with that of the laboratory testing. The findings revealed that the\r\nperformance indices, such as quality of feed index (QFI), multiple index (MULI) and miss index (MISI), were obviously\r\ninfluenced by changing the negative pressure force FQ and rotating speed . The result from test stand highlighted that when\r\nthe negative pressure increased the QFI increased, MULI increased and MISI decreased, however, the QFI decreased and MISI\r\nincreased with increasing the rotating speed. The dynamic analysis likewise revealed that increasing the friction index tang\r\nby choosing a suitable material with high friction angle g for seed plate as well as enlarging the seed hole diameter could\r\nimprove the efficiency of the negative pressure force FQ.
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