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and many others can be made into silage and then converted into biogas.Anaerobic digesters or biogas plants can be directly supplemented with energy crops once they have been ensiled into silage. The fastest-growing sector of German biofarming has been in the area of "Renewable Energy Crops" on nearly 500,000 ha of land (2006). Energy crops can also be grown to boost gas yields where feedstocks have a low energy content, such as manures

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