Энэ нь Video Таны хэл дээр байхгүй байгаа, Нь харах: English (en),
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Sjoerd is a Soil Management Specialist in the Crop Management Extension Group at Penn State University. His work concentrates on sustainable intensification using conservation agriculture. He has helped destitute youth in Kenya start a hay baling business using appropriate technologies and is interested in scaling this effort up.