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Effects of Different Nitrogen Fertilizers on Cadmium Uptake by Wheat*(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

2010 01
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Effects of Different Nitrogen Fertilizers on Cadmium Uptake by Wheat*
ZHAO Jing FENG Wenqiang QIN Yusheng YU Hua LIAO Minglan JIAKA Latie CHENG Yu WANG Changquan TU Shihua
(1Soil and Fertilizer Institute, Sichuan Academy of Agricultural Sciences, Chengdu 610066, China)
(2College of Resources and Environment, Sichuan Agricultural University, Ya’an 625014, Sichuan, China)
(3College of Resources and Environment, Southwest University, Chongqing 400716, China)
Nitrogen variety wheat cadmium Cd uptake

In order to secure safety of agricultural produce originated from the soil that contains cadmium (Cd) close to its critical pollution level and avoid any improper fertilization that can enhance activation and uptake of soil Cd by crops, pot experiments were conducted to study the effects of four major nitrogen (N) fertilizers on Cd uptake by wheat at different growth stages. The results showed that the application of ammonium sulfate, ammonium nitrate and urea significantly improved wheat growth and obviously enhanced wheat yield compared to the ammonium chloride. All N fertilizers increased Cd uptake that differed significantly between the treatments with the highest Cd uptake by the nitrogen chloride treatment and the lowest by the ammonium sulfate treatment. The Cd contents in wheat tissues were increased with an increase in urea dosage. Total amounts of Cd uptake in wheat tissues increased with time, while the Cd concentrations decreased with time from seedling stage to maturity, except ammonium chloride that resulted in the highest Cd content in the tissues at elongation stage. The accumulation of Cd in plant was well related with an increase in wheat biomass, while the amounts of Cd transferred from straw to grains decreased with an increase in grain/straw ratio. It is worth noting that the Cd content in wheat grains surpassed the allowable safety level even when wheat grew on the soil with Cd content below the critical pollution level, indicating that the soil Cd critical values should be set up for each crop or variety rather than a fixed value for all. In order to produce pollution free wheat growing on the soil suffering from Cd pollution or marginal Cd pollution, Cd resistant wheat variety should be adopted, and the use of ammonium chloride or overdoses of urea and other ammonium N fertilizers should be avoided to effectively reduce the activity of soil Cd. Tab 4, Ref 23


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Last Update: 2010-02-09