RESIDUAL EFFECTS OF IRRIGATING CORN WITH DIGESTED SEWAGE SLUDGE

被引:50
|
作者
HINESLY, TD
ZIEGLER, EL
BARRETT, GL
机构
关键词
IRRIGATION - SEWAGE TREATMENT - Sludge Disposal;
D O I
10.2134/jeq1979.00472425000800010009x
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The same corn hybrid (Zea mays L. ) was grown during the last 3 years that Blount silt loam plots were irrigated with liquid, municipal sewage sludge and for the next succeeding 4 years after termination of applications. During the last year in which sludge was applied, leaves from maximum sludge-treated plots contained 112 mg Zn/kg and 7. 1 mg Cd/kg. Four years after sludge applications were terminated, leaves from these plots contained 45 mg Zn/kg and 2. 1 mg Cd/kg. Grain-Zn concentrations decreased from 45 mg Zn/kg during the last year of sludge applications to 27 mg/kg in the 4th year after termination applications. In a similar manner, grain-Cd concentrations decreased from 0. 44 to 0. 07 mg/kg. During the 3rd and 4th years after terminating sludge applications, grain from sludge-treated and control plots could not be distinguised by differences in Zn and Cd concentrations. Soil pH was near neutral throughout the study and was not affected by treatments.
引用
收藏
页码:35 / 38
页数:4
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