Studies on different liquid manure injection tools under laboratory (soil bin) and grassland conditions

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Rahman, Shafiqur
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In this study, five different existing liquid manure injection tools (three sweep-types and two disc-types) were evaluated both in the soil bin and at three prairies with heavy clay, coarse sandy loam with stone, and fine sand soil. In the soil bin, the effects of injection depths and tool forward speeds on soil cutting forces and soil disturbance were investigated. While in the field studies, the effects of injection depths and manure application rates on soil disturbances, odor and ammonia concentration, and agronomic response by crop damage and yield were studied. In the soil bin conditions, among the sweeps, sweep A injection tool required the lowest draft force due to its smallest cutting width and rake angle. On the average, sweep B and sweep C required 12 and 97% more draft force than sweep A sweep due to their wider cutting width. In the field study, highest soil disturbance occurred in clay soil due to its wet soil condition. No significant differences in odour concentration were observed between two selected treatments. Similarly, no ammonia concentration was detected from the surface except for higher application rate (112 m 3/ha) combined with shallow injection depth (80 mm) in clay soil. (Abstract shortened by UMI.)