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  • 1 Czech University of Life Sciences Prague Department of Botany and Plant Physiology Kamýcká 129 165 21 Prague 6 - Suchdol Czech Republic
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In an experiment with two modern varieties (Amulet and Krona) and one historical variety (Nűrnberg) of spring barley stress, invoked by drought, significantly reduced the % content of N and the total amount of accumulated N in the plant bodies in all varieties. On the contrary significantly increased the percentage of N from fertiliser ( 15 N) to the total nitrogen in the plants. Varietal differences were expressed as a tendency to greater accumulation of total N and N from fertiliser ( 15 N) in the modern varieties than in the variety Nűrnberg. On the contrary this variety was found that there was a greater proportion of 15 N to the total amount of N in the plants. Under normal moisture conditions the nitrogen from the fertiliser ( 15 N) was taken in and utilised by the spring barley primarily in the first half of vegetation period and, as a rule, its accumulation in the plants peaked during flowering. Drought slowed down its intake and usage and shifted the maximum accumulation to the post-stress i.e. post-floral period.

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