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Chemical composition of 12 weed species occurring in cereals and roots crops cultivated in south-eastern Poland was investigated. Weed samples from 7 types of habitats differing in their physiographic and pedagogic conditions were collected. Contents of P, K, Ca, Zn, Pb and Cd in weed tops were analyzed. It was found that the levels of macronutiens and heavy metals in weeds, especially Ca, Zn and...
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