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Metal contamination in Nullah Dek water and accumulation in rice.

作者：

Sarfraz M;Mehdi S M;Hassan G;Abbas S T

单位：

;Plant Nutrition Division, Soil Salinity Research Institute, Pindi Bhattian, Pakistan.

关键词：

adsorption;cadmium;chemical analysis;copper;crop yield;electrical conductivity;heavy metals;iron;irrigation water;lead;manganese;nickel;ph;phytotoxicity;pollutants;polluted soils;polluted water;rice;salinity;sodium;so dium carbonate;soil analysis;soil depth;soil pollution;soil types;strontium;water pollution;water quality;zinc

摘要：

A research study was carried out to determine the electrical conductivity (EC), residual sodium carbonate (RSC), sodium adsorption ratio (SAR), pH and metals in metal-polluted irrigation water from a nullah and those in soils over a period of time. The effect of metals on rice yield and metal concentrations in rice grain and straw was also studied. Two sites (I and II) were selected on the bank of Nullah Dek at Thatta Wasiran in Sheikhupura District (Pakistan), with two rice varieties (cv. Super Basmati and Basmati 385), at both sites. Water samples were collected during rice crop growth at 15-day intervals from 3 August to 1 November 2002. The results showed that Nullah Dek water had an EC >1.0 dS m-1 and RSC of 2.78-4.11 mmolc litre-1, which was hazardous for crops, but the SAR was within the safe limit. Copper, Mn, Cd and Sr were also within the safe limits. The soil analysis showed that Site II was free from salinity/sodicity, whereas Site I was saline sodic. Among metals, Zn was sometimes deficient, Cu, Mn and Fe were adequate, and Sr, Ni and Cd were within the safe limits in the soil of both sites. After rice crop harvesting, concentrations of all metals tested were usually slightly increased, being higher in the upper soil layer than in the lower. In addition, Basmati 385 variety produced higher rice grain and straw yield than Super Basmati. Chemical analysis of rice grain indicated the presence of Zn, Cu, Fe, Mn, Pb and Sr, whereas rice straw contained Zn, Cu, Fe, Mn and Sr, with Cd and Ni both being found in minute quantities..

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Metal contamination in Nullah Dek water and accumulation in rice.

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