الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
Decreasing the air suction orifice height (H) of the pneumatic planter, or increasing the forward speed (S), in general, leads to a corresponding increase in the amount of dust in the inlet air. Consequently, the produced vacuum values may be demolished. This in turn demolishes Leeds to a decrease in the seed catching efficiency (CR%) over the vacuum metering disk. Consequently the seed metering uniformity performance will be reduced and the crop production will be affected. The aim of the present work was to study that phenomenon, and to investigate the performance of a pneumatic planter during the planting peanut and corn seeds. Therefore, the present work aimed covers the following objectives: ??Investigating the modifications, and developments requirements. That included a modification to each of the following: a)?position of the air inlet orifice, b)?the fan transmission system, c)?the seed cell diameter. ??Laboratory evaluation the modified pneumatic unit for metering peanut, and corn seeds under different levels of fan speed (Fs), vacuum metering disk rotational speed (CP), and vacuum cell diameter (d). The evaluation based on measuring. Seed catching efficiency (CR %), seed longitudinal distribution uniformity (UH %), and the percent of each seed catching surface (CRS %). ??Make a comparison between the laboratory and field performances of the modified pneumatic planter. ??Evaluate the effect of adding an air filter to the air inlet orifice