Increase of As release and phytotoxicity to rice seedlings in as-contaminated paddy soils by Si fertilizer application
Journal
Journal of Hazardous Materials
Journal Volume
276
Pages
253-261
Date Issued
2014
Author(s)
Abstract
Silicon (Si) was shown to be able to reduce arsenic (As) uptake by rice in hydroponic culture or in low As soils using high Si application rates. However, the effect of Si application on As uptake of rice grown in As-contaminated soils using Si fertilizer recommendation rate has not been investigated. In this study, the effect of Si application using Si fertilizer recommendation rate on As release and phytotoxicity in soils with different properties and contents of As was examined. The results show that the concentrations of As in soil solutions increased after Si applications due to competitive adsorption between As and Si on soil solids and the Si concentrations in soil solutions were also elevated to beneficial levels for rice growth. The rice seedlings accumulated more As and its growth was inhibited by Si application in As contaminated/spiked soils. The results indicate that there is an initial aggravation in As toxicity before the beneficial effects of Si fertilizing to rice were revealed when Si application based on fertilizer recommendation rate to As-contaminated paddy soils. Therefore, for As-contaminated paddy soils with high levels of As, the application of Si fertilizer could result in increasing As phytotoxicity and uptake by rice. © 2014 Elsevier B.V.
Subjects
Arsenic; As uptake; Paddy rice; Phytotoxicity; Si fertilizer
SDGs
Other Subjects
Arsenic; Contamination; Fertilizers; Silicon; Soil moisture; As uptake; Beneficial effects; Competitive adsorption; Contaminated soils; Fertilizer applications; Hydroponic culture; Paddy rice; Phytotoxicity; Soil pollution; arsenic; arsenic trioxide; ferric hydroxide; fertilizer; iron oxide; silicate; silicon; arsenic; fertilizer; silicon; soil pollutant; water pollutant; arsenic; bioaccumulation; biological uptake; detoxification; fertilizer application; paddy field; phytotoxicity; rice; seedling; silicon; soil pollution; adsorption; article; controlled study; dry weight; fertilizer application; growth inhibition; incubation time; nonhuman; phytotoxicity; plant growth; plant height; plant root; rice; root length; seedling; shoot; soil; soil acidity; soil pollution; vegetative stage; biomass; metabolism; rice; soil pollutant; water pollutant; Arsenic; Biomass; Fertilizers; Oryza sativa; Silicon; Soil Pollutants; Water Pollutants, Chemical
Type
journal article