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Description: A mathematical model was developed to predict daily flow and total accumulated silage effluent from a mechanically compacted horizontal silo (bun ker or clamp). Generated daily rainfall over a 50-year period was used to estimate effluent flow and year-to-year variations from a 2001 dry matter (DM) grass crop (12501 silage at 16% DM) harvested by three different systems. A direct-cut non-stop system (DCNS) re sulted in a total of 1600 L of effluent or less per t DM in a wet climate (1440 mm rain per year) and 1120 L/t DM or less in a dry climate (720mm rain per year) at 95% probability (19 years out of 20). Daily maximum flows at 95% probability were 185 L/t DM per day in the wet climate and 119 L/t DM per day in the dry climate. A design effluent storage capacity of 3 m per 1001 silage was found adequate for one-day storage but could result in effluent overflow after two days under very wet conditions. A second harvest system of directcut restricted to non rainy days only (DCNR) reduced total effluent to 1150 L/t DM in the wet climate and 670 L/t DM in the dry climate. Daily maximum flows at 95% probability were 109 L/t DM per day in the wet climate and 54 L/t DM per day in the dry climate, a reduction of 41 to 55% compared to DCNS. A third harvest system that included Fieldwilting (WS) during 6 h resulted in total effluent of 68 L/t DM in the wet climate and 36 L/t DM in the dry climate. Daily maximum flows at 95% probability were 3 L/t DM per day in the wet climate and 2 L/t DM per day in the dry climate. Moderate wilting almost eliminated the problem of silage effluent but it de layed the harvest period from 5 days with the DCNS system to up to 18 days with the WS system.
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Citation: P. Savoie 1995. PROBABILITY ESTIMATION OF SILAGE EFFLUENT FROM HORIZONTAL SILOS. Canadian Agricultural Engineering 37(1):49-56.
Volume: 37
Issue: 1
Pages -
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Date: 1995
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Type: Text.Article
Format: PDF
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Coverage: Canada
Language 1: en
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Rights: Canadian Society for Bioengineering
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