Influence of liming and soil moisture on cadmium, zinc and lead take-off by maize and rape
1999
Bujnovsky, R. (Vyskumny Ustav Podoznalectva a Ochrany Pody, Bratislava (Slovak Republic))
Within a pot experiment with naturally contamined clay-loamy and sandy-loamy Fluvisol was examined the influence of liming and different available water capacity on accumulation of cadmium, zinc, and lead in above-ground biomass of maize and rape. Experimental results confirmed literary findings about higher accumulation of heavy metals by dicotyledons (rape) in comparing to monocotyledons (maize). The concentration of Cd, Zn, and Pb in above-ground biomass was practically unafected by liming of clay-loamy soil with starting pH-value 6.5. On the contrary liming of sandy-loamy soil with starting pH-value 5.3 markedly depressed Cd and Zn concentration and increased Pb concentration in dry matter of both crops. Because lead uptake is realized through the interception, conditions that improve root growth and its distribution in soil simultaneously support also lead uptake by plant. With increased soil available water decreases Cd and Zn concentration in above-ground biomass of both crops namely on limed treatments of clay-loam soil and in all treatments of sandy-loam soil. In case of lead was not observed unambiguous tendency. Influence of liming and available water capacity on amount of heavy metals accumulated in above-ground biomass of crops depends as on their impact on above-ground biomass forming as well as on concentration of heavy metals in dry matter. Liming of clay-loam soil increased uptake of Cd and Zn by maize. In other cases any unambiguous trend was observed. On limed treatments of sandy-loam soil was observed a decrease of Cd and Zn uptake and increase of Pb uptake. In most cases the increase of soil moisture was connected with increase of heavy metal uptake by maize and rape on both soils
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