Published in Scientific Papers. Series A. Agronomy, Vol. LXIV, Issue 1
Written by Eugen PETCU, Liliana VASILESCU, Viorel ION
The grain uniformity of the malting barley has a decisive role in determining the malting quality and the process efficiency. One of the main technological factors which influence malting barley quality, including the grain size and the grain uniformity is the seed rate. Starting from these ideas, the objective of this study was to evaluate the response of different winter barley genotypes to different seed rates and to identify winter barley genotypes with high stability regarding seed size fractions as related with grain yield across two seed rates. In this respect, eighteen winter barley genotypes were tested for grain yield and size seed fractions for three consecutively years (2017, 2018, 2019) at National Agricultural Research and Development Institute Fundulea (NARDI Fundulea). In order to be used in brewing industry, the value of barley seeds is estimated based on their size, namely assortment (size of seed >2.8 mm and >2.5 mm/assortment I+II). The contribution from the average yield of each genotype, representing the percentage of seeds larger than 2.5 mm and 2.8 mm, was evaluated and the response of studied genotypes to the different seed rates were determined on the ANOVA and coefficient of variation basis. ANOVA showed that year (Y), genotype (G), year x genotype (Y x G), seed rate x genotype (S x G) and triple interaction year x seed rate x genotype (Y x S x G) significantly influenced the seed size >2.8 mm and 2.5 mm with a coefficient of variation of 6.47% and 31.7%, respectively. As source of variation, the seed rates (S) and interaction between year x seed rate (Y x S) was insignificant for both category seed size. The most winter barley genotypes had a positively response to the lower seed rate, both for yield and seed assortment, especially for seed size >2.8 mm.
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