Hunan Agriculture and Environment Research Center

Changsha, China

Hunan Agriculture and Environment Research Center

Changsha, China
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Liu Z.-B.,Hunan Soil and Fertilizer Institute | Liu Z.-B.,Hunan Agriculture and Environment Research Center | Ji X.-H.,Hunan Soil and Fertilizer Institute | Ji X.-H.,Hunan Agriculture and Environment Research Center | And 5 more authors.
Chinese Journal of Applied Ecology | Year: 2010

Taking Cd polluted reddish yellow paddy soil ( RYPS ) and alluvial loamy paddy soil ( ALPS) as test objects, pot experiments were conducted to study the effects of different water management modes, including whole growth season flooding (WF), draining and sunning field at tillering stage (TP), draining and sunning field at milk stage ( MP), draining and sunning field at tillering and milk stages (TMP), and wetting irrigation ( WI), on die Cd absorption and accumulation by rice. For the two test soils, their Fe2+ content was the highest in treatment WF and the lowest in treatment TMP. Compared with TMP, treatment WF increased the Fe2+ content in ALPS by 585.4% and that in RYPS by 1316.3%. The contents of available S and available Cd in the two soils were all in the order of WF


Liu Z.-B.,Hunan Soil and Fertilizer Institute | Liu Z.-B.,Hunan Agriculture and Environment Research Center | Ji X.-H.,Hunan Soil and Fertilizer Institute | Ji X.-H.,Hunan Agriculture and Environment Research Center | And 8 more authors.
Huanjing Kexue/Environmental Science | Year: 2011

The effects of paper mill sludge, red mud and zinc fertilizer addition on remediation of acid cadmium contaminated paddy soil were studied in a pot experiment, and their beneficial effects were verified in a field experiment, by using lime as comparison. The pot experiment results showed that a single application (2 g·kg -1) of lime, paper mill sludge or red mud increased soil pH significantly. Compared with no applying alkaline substances, the soil exchangeable Ca content was increased by 33.1%-76.0% at 7 days after applying alkaline substances and 31.0%-78.3% at 30 days after rice transplanting, respectively. The soil available Cd content was significantly decreased by 38.4%-45.0% at 7 days after the three alkaline substances applications, and was decreased by 37.4%-52.9% and 33.2%-38.7% at 30 days and 60 days after rice transplanting, respectively. The Cd content in rice root and brown rice was decreased by 24.0%-48.5% and 26.3%-44.7%, respectively. With equal applications of lime, paper mill sludge and red mud, the effects on increase of soil pH and decrease in Cd accumulation by rice was lime > red mud > paper mill sludge. Compared with a single application (2 g·kg -1) of paper mill sludge or red mud, Cd accumulation decreased significantly following the application of zinc fertilizer (0.2 g·kg -1). The field experimental results were similar to the pot experiment that Cd accumulation apparently declined in the first and second crops (late rice and autumn rape) following the application of paper mill sludge, red mud and addition of zinc fertilizer. The Cd content in brown rice and rape seeds was decreased by 27.1%-65.1% and 16.4%-41.6%, respectively, compared with no alkaline substances application. The Cd content in brown rice reached the National Hygienic Standard for Grains (GB 2715-2005). Therefore, combined application of paper mill sludge or red mud with zinc fertilizer was a feasible method to remediate acid cadmium contaminated paddy soil. Rice quality was guaranteed by determination of rational amount of alkaline wastes and a proportion of zinc fertilizer which was in accord with soil Cd contamination level and chemical properties, etc.

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