Auger metering studies for fine prilled URSA

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dc.contributor.authorMwombeki, Francis Fabian
dc.date.accessioned2025-12-24T13:05:43Z
dc.date.available2025-12-24T13:05:43Z
dc.date.issued1988
dc.descriptionDissertation
dc.description.abstractABSTRACT Tne performance of sheet ana 'wire au6ers was studied for meterin6 prilleu urea fertilizer. First the physical characteristics of prilled urea was established. It was found that the angle of repose and the coefficient of fricition on galvanized steel surface increased with increased moisture content.The opening of the hopper bottom, inclination of hooper walls and modes of agitation were studied for uiiximizing fertilizer flow into the metering chamber. A bottom opening width of jO mm, hopper wall angle of 60 o with the horizontal and a rotary or eliptical agitation modes aere founu to provide optimum flow.Succeeding experiments were conducted to study the rate and consistency of fertilizer metering by sheet and wire auoer unaer varying pitch/diameter ratio,delivery tube in .ination, au6er speed and fertilizer moisture.Rate of fertilizer injection into flooded soils was studied under simuxared field conditions. Assessment was also made of the amount of r.-rti 1 i zer adhering to the augers during metering. A pitch diameter ratio of 1.25 give a maximum found to diecharge. Also, fertilizer discharge increased with greater inclination of the delivery tube and decreased with increasing fertilizer moisture contents.The metering accuracy generally decreased with greater inclination of the delivery tube fertilizer granule size decreased metering accuracy.The experiments, of injecting fertilizer in flooded soils were conducted in a rotating soil bin to simulate actual field conditions.The inclination of the delivery tube along the direction of the bin movement gave a higher injection rate than an inclination against the bin movement. The wire auger exhibited a greater injection capability than the sheet auger and produced higher pressure at the tube opening.This auger also encountered less sticking of fertilizer on the flight than the sheet auger.
dc.description.sponsorshipInternational Rice Research Institute
dc.identifier.urihttps://www.suaire.sua.ac.tz/handle/20.500.14820/7203
dc.language.isoen
dc.publisherSokoine University of Agriculture
dc.titleAuger metering studies for fine prilled URSA
dc.typeThesis

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