SEWAGE SLUDGE: SOIL CONDITIONER AND NUTRIENT SOURCE: II. AVAILABILITY OF CU, ZN, PB AND CD TO BARLEY IN A POT EXPERIMENTстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:The effects of sewage sludge (SS) application on NH4NO3-extractable
Cu, Zn, Pb and Cd as well as metal uptake by barley (Hordeum
vulgare L.) were investigated using a sandy loam soil (pH in
water = 6.7). Treatments comprised three replicates each and were as
follows: untreated soil (control), two that received a Russian (SSR)
and two that received a Swedish SS (SSS). The SS application based
on N applied at rates of 100 (SSR1 and SSS1) and 300 (SSR3 and
SSS3) mg N kg- 1 dry soil, respectively. Soil metal levels determined
immediately after mixing the soils with SS were markedly increased.
However, cropping the soils strongly decreased their Cu, Zn and Pb
levels, while leaving substantial amounts of residual Cd in the soils,
regardless of the treatment. Metal uptake in shoots and roots was
significantly (P = 0.05) enhanced by SS applications. Rates of metal
uptake in roots were significantly (P = 0.05, n = 64) correlated with
the pre-cropping soil metal contents. The bulk of the metals absorbed
by the plants remained in roots. On average, transport index defined
as the percentage of total metal uptake (shoots + roots) that was
translocated to the shoots, was about 40, 50, 30 and 20% for Cu, Zn,
Pb and Cd, respectively. Cd uptake was highest in SSR3, while Cu
and Pb uptakes were highest in SSS3 These results suggest that the SS
may not be "environmentally friendly".