Tag Archives: plant height

xxx Kh.S. Mayrapetyan, A.S. Eghiazaryan, S.A. Eloyan and A.S. Karapetyan
Role of planting density on the growth efficiency of Juniperus virginiana L. under open-air hydroponic conditions of the Ararat Valley
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Role of planting density on the growth efficiency of Juniperus virginiana L. under open-air hydroponic conditions of the Ararat Valley

Kh.S. Mayrapetyan, A.S. Eghiazaryan, S.A. Eloyan and A.S. Karapetyan*

G.S. Davtyan Institute of Hydroponics Problems, NAS RA, 108 Noragyugh,
AM0082 Yerevan, Armenia
*Correspondence: astghik84k@rambler.ru

Abstract:

Juniperus virginiana (J. virginiana) is an evergreen coniferous tree, which has wide usage not only in green construction, but also in folk medicine as a source of valuable bioactive substances. The high demand for the tree forces the development of new methods for plant cultivation. Hydroponics is considered to be one of the most popular methods. As the soilless growing perspectiveness of J. virginiana in Armenia has previously been confirmed by our experiments, the optimization of growing conditions, which bests suits for the enhancement of the growth efficiency and accelerated production of viable trees remains an actual issue. Optimization of the planting density (PD) is one of them. Taking into account the above-mentioned in the frame of this study the role of PD on the growth efficiency of J virginiana has been studied in open-air hydroponic conditions of the Ararat Valley for the first time. The saplings of the tree were planted in volcanic red slag with three different PDs: 10, 12 and 14 plants per square meter. According to the biometrical measurements, no significant differences between the variants were observed at the end of the experimental period. In October an average height and stem diameter of the plants grown in various PDs were fluctuated between 71.7–76.5cm and 13.9–14.5mm, accordingly. Positive relationship between the plant height and stem diameter of J․ virginiana during the whole vegetation period has been observed. Our preliminary studies showed, that all the applied PDs are preferable for early years of hydroponic growing of
J virginiana in open-air hydroponic conditions of the Ararat Valley.

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99–103 Ü. Tamm
The variation of agronomic characteristics of European malting barley varieties
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The variation of agronomic characteristics of European malting barley varieties

Ü. Tamm

Jõgeva Plant Breeding Institute, 48309 Jõgeva, Estonia; e-mail: Ylle.Tamm@jpbi.ee

Abstract:

The field experiments were carried out in 1999_2002 at the Jõgeva Plant Breeding Institute (PBI) in Estonia to investigate the genetic and environmental variation of agronomic characteristics of malting barley. 57 malting barley varieties were included in the trials. Grain yield, number of tillers per 1m², plant height, lodging resistance and growing time were measured in the trial with malting barley.
 Despite very different weather conditions, the grain yield stability of malting barley varieties was very high. Tillering  showed somewhat lower genetic variability compared to the variation of grain yield. The plant height indicates moderate genetic variability. Lodging resistance and growing time showed  low genetic variability.

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