ISSN 2285-5785, ISSN CD-ROM 2285-5793, ISSN ONLINE 2285-5807, ISSN-L 2285-5785


Published in Scientific Papers. Series A. Agronomy, Vol. LXVI, Issue 1
Written by Svetla KOSTADINOVA

Macronutrients content of five barley varieties was studied at three levels of nitrogen 0, 200, and 400 mg N/kg soil. It was found that the Kristi variety had a low grain protein content of 8.8% on average. Obzor, Krami and Kaskadior varieties increased the crude protein in the grain to 12.3-13.0% at the N400 level. Strong positive correlation was proven between the soil nitrogen and grain protein (r=0.993**). Added nitrogen (N400) increased the straw nitrogen content from 0.51% N0 to 0.74% N. The Krami variety showed a higher concentration of grain phosphorus 0.87% P2O5, on average. The grain potassium content slightly depended on the variety. Varieties grown at N400 level had a higher concentration of potassium at maturity and of phosphorus in the grain than the plants at N0. Calcium content of grain was higher in Emon and Kristi varieties (0.30 and 0.29% CaО, respectively), and in straw in Kristi and Kaskadior (1.10 and 1.14% CaО, respectively). Nitrogen level had a little effect on the calcium and magnesium contents. Their average concentrations of barley grain were 0.28% CaO and 0.12% MgO at N400 variant.

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