Estimation of quantity of stored silage in a cylinder-shaped silo.
1995
Odai M.
Grasping precise quantity of stored silage in silos will be indispensable for plans to cultivate feed crops or supply roughage. Therefore, with a view to establishing methods of estimating quantity of stores as accurately as possible, the following examinations were performed. 1) Study of the relation between moisture contents in materials and densities of fresh silages or dried ones in silos were carried out using maize and Italian ryegrass loaded into two types of airtight silos. Consequently, densities of the fresh silages were greatly affected by moistures in the materials in the materials and changed to remarkably high in accordance with increasing quantity of moisture. Referring to densities of dried stores, it was found to be within 180-260 cubic-meter regardless of types of materials and size of the silos. 2) Density of fresh silage for calculation of the structure of a silo is usually estimated by the following equation; B.S. formula 5061. 100/(100-moisture content in silage(%)) x (140+14.4hs) hs: the height of silage(m) Quantity of fresh silage is estimated by multiplying density calculated following the above equation by capacity of a silo. In this experiment, two methods were employed to calculate it. The first method, which is usual way, was by dividing the surface of the silage in a silo into the layers of every 1.0m using the above equation. Next, in the airtight silo in a body the materials were difficult to be fully packed up to the eaves of the silo because of the structure. For this reason, the height of the store was calculated by deducting some of the length from the height of the caves in advance according to the condition at loading. These results taken together indicate that the second method will be able to be utilized for estimation of quantity of fresh silages in any of these silos; general silos, airtight ones or ones which are not fully loaded.
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