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A field trial with four red clover cultivars was established on acid soil in order to evaluate the effect of foliar boron application on seed yield. The crop received foliar boron treatment during the second growth of the second year at two applications. Although seed yield showed a significant increase in boron-treated plants in 2011 compared with control (26.0%), its relative increase was far higher in 2010 (43.2%), which had increased total rainfall amounts during flowering. Sufficient level of boron supply to red clover plants for seed production has a remarkably positive effect under conditions hampering pollination and fertilisation.

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Taking into consideration the importance of alfalfa as a fodder plant, breeding for increasing the genetic seed yield potential is necessary due also to relatively low and uneven seed yields. The aim of the paper was to based on the analysis of yield and yield components choose genotypes with differences in the characteristics examined in order to use them in further investigation as the starting material for hybridization for the purpose of increasing the seed yield potential. In five selected alfalfa genotypes the following was analyzed: the number of inflorescences per stem, the number of pods per inflorescence, the number of grains per pod and seed yield per plant as well as seed quality parameters (1000-grain weight, germination energy, germination and hard-grain percentage). The highest number of inflorescences per plant was registered in the genotype 9 (8.82), the highest number of pods per inflorescence (8.35) and the highest seed yield per plant (6.89 g) were recorded in the genotype 2. The number of grains per pod was relatively even in all genotypes. The genotypes examined were characterized by high germination energy, germination and 1000-grain weight. As the chosen genotypes (1, 2, 4, 6 and 9) had relatively high variability in the properties examined, they were selected to be parents for diallel crossing or the starting material for breeding of this species for increasing the genetic seed yield potential. [ABSTRACT FROM AUTHOR]

Copyright of Zbornik Radova - A Periodical of Scientific Research on Field & Vegetable Crops is the property of Institute of Field & Vegetable Crops and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)