Abstract
It is rotined that in the modern terms of management in default of stock-raising and manure indemnification of elements of feed takes place due to uncommodity part of harvest, that is considered as biologithation of crop rotations. In 5 field crop rotations with a pea and herbares without top-dressing returning all uncommodity part, provides complete indemnification of makroelements feeding on potassium, and on nitrogen and phosphorus bal ance was negativ. At top-dressing in uncommodity part of harvest there was sufficient number of elements of feed for achievement of positive balance on nitrogen and phosphorus, and in medial 1 ga of crop rotation retorn: 22 kg of nitrogen, 33 kg of phosphorus and 102 kg of potassium.
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