Effect of soil applied phosphorus on arsenic accumulation in rice
2016
Javid, N.
Arsenic (As) is known to cause cancer in human. It may cause skin, lung and bladder cancer. Chronic poisoning of arsenic includes diabetes, non-carcinogenic end point such as cardiovascular diseases. Consumption of As contaminated rice is considered one of the major pathways of As entry into human body. Therefore, it is necessary to minimize As accumulation in rice. A pot experiment was undertaken to assess the effect of phosphorus on As availability and accumulation in rice (Oryza sativa L.). For this experiment uncontaminated surface soil was collected from research area, Institute of Soil and Environmental Sciences, University of Agriculture, Faisalabad. Soil was prepared and artificially contaminated with As at 0, 10 and 20 mg per kg dry soil. Two factors were used i.e. three levels of As (0, 10 and 20 mg per kg dry soil) and three levels of phosphorus (0, 25 and 50 mg per kg) obtained from sodium arsenate and potassium di hydrogen, phosphate, respectively. Growth and yield parameters like plant height, shoot fresh weight, shoot dry weight, and grain yield were recorded. Shoot and grain samples were digested with di-acid mixture and were analyzed for Arsenic (As) concentration using atomic absorption spectrophotometer. Data were statistically analyzed to assess the impact of treatments. The results showed that As addition in soil caused a decline in yield through its adverse impact on number of productive tillers, root and shoot biomass. Additionally As concentration in plants increased with increasing level both of As and P in soil.
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