Effect of zinc on the yield of spring barley in a pot experiment | Влияние цинка на продуктивность ярового ячменя в вегетационном опыте
2010
Kaznina, N.M. | Titov, A.F. | Lajdinen, G.F. | Batova, Yu.V., Russian Academy of Sciences, Petrozavodsk (Russian Federation). Karelian Research Centre. Inst. of Biology
The effect of high zinc content (40, 80, 160, 320 mg/kg of substrate) was studied in relation to productivity of spring barley and some physiological parameters influencing its formation in Karelia. Zinc did not influence adversely on germination of barley when the content varied from 40 to 320 mg/kg of substrate. In the stage of two leaves zinc concentrations of 80-320 mg/kg of substrate inhibited plant growth with a higher level of slowing root growth compared with shoot growth. A leaf area and a rate of photosynthesis reduced under zinc that could be one of the main reasons for reducing barley productivity, although a content of chlorophyll in the leaves remained unchanged. Effect of zinc on a water regime of plants was associated with a decrease of transpiration that allowed them to retain a significant amount of water in the tissues of leaves and roots. In later stages of ontogenesis- in the phase of grain maturation an increase of zinc concentrations in the substrate led to a decrease of a flag leaf area and of aboveground biomass productivity, mainly due to suppression of shoot formation. Reduced grain productivity of barley under zinc was caused mainly by a decrease of a number of caryopses in a spike.
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