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


Published in Scientific Papers. Series A. Agronomy, Vol. LXIII, Issue 1
Written by Liliana VASILESCU, Eugen PETCU, Alexandrina SÎRBU, Lenuţa Iuliana EPURE

This paper aimed at estimating the yield extract of some Romanian winter barley genotypes (six and two-row varieties and breeding lines), using different growing conditions (nitrogen fertilizer rate). All the experiments were performed at NARDI Fundulea and during the 2013-2016 period, winter six-row barley and two-row barley genotypes were tested under different N rates (NR0, NR1 and NR2). The obtained results were used to determine yield extract of each genotype (using Bishop’s formula), perform the variance analysis, and asses the correlations of the studied parameters (grain weight, protein content, and yield extract). ANOVA showed a genotype and N fertilizer rate significantly influenced on grain weight, protein content, and yield extract for both six and two-row genotypes and for all nine tested conditions. For all winter six-row barley quality parameters under two years an insignificant influence of genotype x N rate interaction on these was showed while winter two-row barley revealed a different behavior. This source of variation was significant only one experimental year for protein content, two years for yield extract and one year for grain weight. The yield extract, grain weight, and protein content were assessed separately among winter six-row and two-row barley. Under all N rate (except NR2 for winter six-row barley and NR0 for winter two-row barley) there was a significant negative correlation between yield extract and protein content (from -0.54 to -0.89 and -0.61 to -0.89 respectively). The same comparison showed that the grain weight was not correlated with protein content for winter two-row barley under any of the experimental year conditions; while this was positive in two years for winter six-row barley (from 0.42 to 0.77). During the 2013-2016 period, the yearly average yield extract has varied due to change of the protein content and grain weight, namely was noticed an increasing tendency from NR0 to NR1 and a decrease one from NR1 to NR2.

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