Literatura

Abstract

The study concerned the content of phosphorous, potassium and calcium in the straw of winter oilseed rape grown in 2008/2009 and 2009/2010 in Poland. Field experiment was carried out with different levels of nitrogen (0, 100, 200 kg·ha -1 ) and balanced doses of phosphorus -potassium fertilization. In the spring, plant stems were inoculated with the pathogenic fungus Sclerotinia sclerotiorum , that causes stem rot or white mold. Chemical analysis was performed using stems with artificial as well as natural infestation and compared to uninfected plants. The straw of infected plants had different chemical composition than that phospho rous, the to potassium. Nitrogen fertilization caused the increase of all studied elements. Different concentrations of phosphorous, potassium and calcium resulted in changes in their gravio metric ratio.