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Effects of 1000 parts per million copper chromium nickel lead and zinc on nitrogen immobilization and mineralization during incubation of soils treated initially with 0.1 percent sucrose plus 0.1 percent cellulose and 100 parts per million nitrogen



Effects of 1000 parts per million copper chromium nickel lead and zinc on nitrogen immobilization and mineralization during incubation of soils treated initially with 0.1 percent sucrose plus 0.1 percent cellulose and 100 parts per million nitrogen



Bangladesh Journal of Scientific and Industrial Research 14(1-2): 25-29



A study was made of the effects of 1000 ppm Cu, Cr, Ni, Pb and Zn on mineral-N levels during incubation (30.degree. C, 50% maximum water holding capacity) over 21 wk of sandy soils (pH 6 and 7) treated initially with 0.1% each of sucrose plus cellulose and 100 ppm N as KNO3. During the immobilization phae (0-1 wk) all added elements except Pb decreased the extent of immobilization of mineral-N at pH 6, while at pH 7 all added elements except Cr had this effect. At pH 6 Cu, Ni and Zn altered the preference of N-mineralizing microorganisms so that there was an increased immobilization of nitrate compared to ammonium; at pH 7 only Ni altered the preference in favor of nitrate immobilization. At the end of the mineralization phase (1-21 wk) Cu, Ni and Zn increased N-mineralization at pH 6, while only Ni increased it at pH 7; at pH 6, mineral N accumulated almost entirely as nitrate with all treatments except Ni, while at pH 7, mineral-N accumulated entirely as nitrate with all treatments. At pH 6, but not at pH 7, only Cr caused a second immobilization phase during 12-21 wk period.

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Accession: 005285549

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