Reaction of Different Varieties Winter Barley (Hordeum vulgare) to Lead Concentration in the Soil
Agricultural University, BG-4000 Plovdiv, Bulgaria
MANOLOV, I., 1999. Reaction of different varieties winter barley (Hordeum vulgare) to lead concentration in the soil. Bulg. J. Agric. Sci., 5: 731-736
A pot experiment included three soil lead levels (0, 100 and 1000 mg Pb/kg soil), two soils (pH – 7.3 and 4.8) and eight Bulgarian winter barley varieties was carried out. Fifteen plants per pot (5 kg soil) were grown. Contents of available Pb, Cu, Zn, Mn and Fe in the soil after end of the barley vegetation as well as grain content of Pb, Cu, Zn, Mn and Fe and yield components were determined. The content of mobile lead has increased 120 times at the variant with the highest lead rate at soil with pH – 4.8. For the soil with pH – 7.3 this increasing was only 20.5 times. The Pb content in barley grain from all studied varieties was relatively low from 0.1 to 0.5 mg Pb/kg. Content of Pb in soil up to 1000 mg/kg did not lead to considerable increasing of Pb concentration in barley grain grown on neutral and slight acid soils. The variety Jubiley-100 was distinguished with the lowest content of Pb in barley grain. The variety Krasi-2 was more tolerant to high Pb concentration in slight acid soil than cvs Zenit and Jubiley-100. Stronger decreasing of number of grains per plant, grain and straw yield were measured.
Key words: lead, barley, soil contamination
Abbreviation: concentration factor (CF)