Balance and forms of zinc in soil and its uptake by plants

• Main Authors: Šárka Poláková, Miroslav Florián
• Format: Article
• Language: English
• Published: Mendel University Press 2006-01-01
• Series: Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis
• Subjects: zinc; zinc balance; zinc extraction; zinc contamination
• Online Access: https://acta.mendelu.cz/54/1/0059/
• ISSN: 1211-8516; 2464-8310

In this paper, zinc flows in arable soils of the Czech Republic and zinc fractions in arable soils are studied. Furthermore, a zinc uptake by agricultural plants is focused. Based on a database of the programme The basal soil monitoring system (BSMS) a static zinc balance for arable soils on the national level was assessed. This programme is carried out by The Central Institute for Supervising and Testing in Agriculture (CISTA) in Brno. As a representative for the zinc balance calculation, 121 monitoring plots were chosen. The Czech Republic net zinc fluxes ranged from –1250 g.ha– 1.y– 1 to +5595 g.ha– 1.y– 1, median +453 g.ha– 1.y– 1. The maximum zinc fluxes are typical of plots with manure applications. An atmospheric deposition is the most important input of zinc into arable soils. It makes 96,6% of the whole inputs. Leaching and run-off are neglected in this zinc balance by reason of missing credible data. The project Examination of zinc availability in dependence on its form in soil was established to provide more information about behavior of zinc in soil. The first step was starting a greenhouse pot experiment, which was focused on comparison of several extraction agents (AR, 2M HNO3, 0.43M HNO3, Mehlich III, DTPA, CAT, 1M NH4NO3, 0.01M CaCl2). Four soils with increasing zinc content were picked out for this experiment (Domanínek, Chrlice, Kutná Hora, Hlízov). Total zinc contents in these selected soils ranged from 156.8 to 583.7 ppm in dry matter (Aqua regia extraction). Contents in plants were in wide range from 20.7 to 273 ppm in dry matter according to the plant variety and used soil. Strong correlations between 0.43M HNO3, Mehlich III, DTPA and CAT were proved. Using of weaker extraction agents enabled to distinguish geogenic and anthropogenic origin of the contamination.