Date Full Report Received12/01/2017
Date Abstract Report Received12/01/2017
Funded ByNational Pork Board
Each manifold tested had a different design and showed its performance capabilities and limitations in terms of the gallons per acre application rate it can adequately support. Results, thus, caution to appropriately select a manifold for applying manure so that the lowest possible coefficient of variation is achieved. Field testing also showed that it is helpful to eliminate any loops in the discharge hoses connected to manifold outlets as the hoses transverse over the tool-bar to the tool-bar points. Mounting the manifolds at the highest point possible should be considered, along with use of hose racks so the loops in the discharge hoses can be eliminated. Hose racks, if used, should be placed to achieve a continuous down gradient from the manifold outlet to the tool-bar point. Any vents provided on the manifold outlets need to be clean and functioning so they allow all the leftover liquid in the hoses to discharge freely and do not allow air-locks to develop within the hoses or in the manifold chamber. The coefficient of variation can be improved with increase of drive speed as it will increase the flow rate (gpm) through the manifold chamber. This option should be considered, where feasible, when trying to improve distribution. The results did not show a direct correlation in how the CV changed with increase in slopes studied, although, certain manifolds showed increased variability with increase in slope. The results presented in this report should be used with caution when dealing with distribution of liquid manures with higher viscosities.