The objective of this study was to apply the precision metering on wheat seeding to overcome seed damage, seed loss\r\nand non-uniform distribution. Accordingly, a prototype of the pneumatic precision metering device for wheat was developed.\r\nThe performance of the device, including quality of feed index (QFI), multiple index (MULI), miss index (MISI) and seed rate\r\nexpressed in number of kernels per meter length (KPM), was investigated under laboratory conditions in Wuhan using a test\r\nstand with camera system. The results revealed that the rotating speed (RS) and negative pressure (NP) and their interactions\r\nhad a significant effect on these variables. The maximum QFI (92.98%) was obtained at rotating speed of 19.0 rpm and\r\nnegative pressures of 2.5 kPa with MULI and MISI of 2.01% and 5.09%, respectively. However, the seed rate (KPM) was\r\nless than the recommended compared to previous hypothesis. The best seed rate was 53 KPM producing QFI of 89.11% with\r\nMULI and MISI of 9.00% and 1.88%, respectively at rotating speed of 34 rpm and negative pressure of 4.5 kPa. The\r\nrecommended seed rates estimated at 40 KPM and 53 KPM for 12 cm and 15 cm row spacing respectively were achieved at a\r\nrange of RS and NP with QFI ranging between 84.57 to 89.11%. The study demonstrated that wheat could be seeding within\r\nan acceptable precisely range by pneumatic precision metering device.
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