The effect of the previous crop and differentiated fertilisation on yields and content of N-substances in spring barley grain
2009
Hrivna, L.,Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic). Ustav Technologie Potravin | Richter, R.,Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic). Ustav Agrochemie, Pudoznalstvi, Mikrobiologie a Vyzivy Rostlin | Ryant, P.,Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic). Ustav Agrochemie, Pudoznalstvi, Mikrobiologie a Vyzivy Rostlin | Prikopa, M.,Statni Rostlinolekarska Sprava, Brno (Czech Republic)
In small-plot experiments established in 2001-2004 we studied the effect of the chemical composition of the plant dry matter of spring barley (varieties Kompakt and Jersey) on grain yields. Relatively strong correlations were confirmed between the concentrations of different elements in the dry matter and yield. The correlation was most intensive in the case of N (r=0.536), P (r=0.503), Mg (r=0.464) and S (r=0.431) at the beginning of shooting (DC 30); in the case of K (r=0.557) at the beginning of tillering (DC 23) and Ca (r=0.530) during ear formation (DC 55). A relatively strong correlation remained from the beginning of tillering to the beginning of ear formation. It decreased later. The weather conditions and variety significantly affected grain yields. Grain yields of the variety Kompakt were significantly lower than those of the variety Jersey (6.02 t/ ha and 6.45 t / ha, respectively). The previous crop was also important. The highest yields were obtained after sugar beet (6.30-6.79 t/ ha). Higher grain yields of the Jersey variety resulted in lower levels of N-substances (11.35%) than in the Kompakt variety (11.60%). There was no correlation between the N level in the plant dry matter during vegetation and the content of N-substances in barley grain.
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