Variations in heavy metal accumulation, growth and yield of rice plants grown at different sewage sludge amendment rates
Variations in heavy metal accumulation, growth and yield of rice plants grown at different sewage sludge amendment rates
复制标题
DOI：
10.1016/j.ecoenv.2010.01.020
复制
发表时间：
2010-05-01
影响因子：
6.8
通讯作者：
Agrawal, M.
中科院分区：
文献类型：
--
作者：
Singh, R. P.;Agrawal, M.
在农业中使用污水污泥是这种废物的替代处理技术。通过田间试验，研究了污泥改良剂对水稻生长的适宜性。研究了不同污泥添加量（0、3、4.5、6、9、12 kg·m~（-2））下植物对重金属的积累、生长、生物量和产量的响应。污泥改良土壤的理化性质，从而增加土壤中的重金属的有效性，从而在植物部位的积累更高。根长下降，而芽长，叶数，叶面积和总生物量显着增加时，生长在不同的SSA率。施用3、4.5、6、9和12 kg/m~（-2）的污水污泥，水稻产量分别比对照增加60%、111%、125%、134%和137%。但由于稻米中镍和镉的浓度高于印度的安全限值，因此造成了食物链污染的风险（1.5 mg kg（-1））的人类消费量高于4.5 kg m（-2）SSA和Pb（2.5 mg kg（-1））高于6 kg m（-2）SSA。在4.5kg·m~（-2）SSA处理水平下，水稻地上部分的Ni、Cd、Pb含量也超过允许水平，不能作为饲料使用。稻壳可用作能源生产的生物资源。小型工业的污水应先加以处理，然后才排入污水渠系统。(C)2010年爱思唯尔公司All rights reserved.
Use of sewage sludge in agriculture is an alternative disposal technique for this waste. The present field study was conducted to assess the suitability of sewage sludge amendment in soil for rice (Oryza sativa L cv. Pusa sugandha 3) by evaluating the heavy metal accumulation, growth, biomass and yield responses of plants grown at 0, 3, 4.5, 6, 9, 12 kg m(-2) sewage sludge amendment (SSA) rate. Sewage sludge amendment modified the physico-chemical properties of soil, thus increasing the availability of heavy metals in soil and consequently with higher accumulation in plant parts. Root length decreased, whereas shoot length, number of leaves, leaf area and total biomass increased significantly when grown under various SSA rates. Yield of rice increased by 60%, 111%, 125%, 134% and 137% at 3, 4.5, 6, 9 and 12 kg m(-2) SSA, respectively, as compared to those grown in unamended soil.Sewage sludge amendment rates above 4.5 kg m(-2) though increased the yield of rice, but caused risk of food chain contamination as concentrations of Ni and Cd in rice grains were found to be above the Indian safe limits (1.5 mg kg(-1)) of human consumption above 4.5 kg m(-2) SSA and of Pb (2.5 mg kg(-1)) above 6 kg m(-2) SSA. Since aboveground parts of the rice also showed higher concentration than the permissible levels of Ni, Cd and Pb at 4.5 kg m(-2) SSA rate, it cannot be used as fodder. The rice husk may be used as bioresource for energy production. Efforts should be made to treat the effluents from small scale industries before discharge into the sewerage system. (C) 2010 Elsevier Inc. All rights reserved.