Ратарство — разлика између измена

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* [http://www.dailymail.co.uk/news/article-1145431/Now-farm-help-teach-world-live-oil-says-woman-banished-plastic-bags-town.html I will teach the world farming without oil]
* [http://www.umequip.com/tillage/primary/zone-builder Manufacturer of Agricultural Zone Till Subsoiler with Photos] (umequip.com by Unverferth Equipment)
* {{Cite book|last = Brady|first = Nyle C.|authorlink =|author2=R.R. Weil|title = The nature and property of soils, 13th edition|publisher = Prentice Hall|year = 2002|location = New Jersey|isbn id=ISBN 0-13-016763-0 }}
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