TAILIEUCHUNG - Effect of Al compounds on soil pH and bioavailability of Al in two acid soils

Two aluminum compounds, AlCl3 and Al(OH)3, were used to determine the effect of Al compounds on pH and bioavailability of Al in 2 acid soils. Both soils were incubated for periods of 3, 10, and 30 days. | Research Article Turk J Agric For 36 (2012) 720-728 © TÜBİTAK doi: Effect of Al compounds on soil pH and bioavailability of Al in two acid soils Md. Toufiq IQBAL Department of Agronomy and Agricultural Extension, University of Rajshahi, Rajshahi 6205 – BANGLADESH Received: ● Accepted: Abstract: Two aluminum compounds, AlCl3 and Al(OH)3, were used to determine the effect of Al compounds on pH and bioavailability of Al in 2 acid soils. Both soils were incubated for periods of 3, 10, and 30 days. Al-tolerant (ET8) and Al-sensitive (ES8) wheat seedlings were used as a testing plant to confirm bioavailability of Al3+ in soil solution. Both soils were acidified through the addition of Al compounds to detect the maximum Al3+ toxicity level of these compounds. The results showed that the AlCl3 compound increased the bioavailability of Al3+ in soil solutions. In contrast, AlCl3 decreased bulk soil pH. This combination of high levels of extractable Al and low pH decreased the root proliferation of both ES8 and ET8. However, Al(OH)3 did not change soil pH, the bioavailability of Al, or the root length of either ES8 or ET8. These findings indicated that Al(OH)3 did not increase Al3+ activity in soil solutions. It can be concluded from this study that AlCl3 and a short incubation period can be used to manipulate soil pH and the bioavailability of Al in soil for further study. However, Al(OH)3 cannot be used to manipulate soil pH or the bioavailability of Al in soil. Key words: Aluminum, bioavailability, ES8, ET8, incubation time, soil type Introduction Soil aluminum chemistry is quite complex and different forms of Al available in soil are involved in the retention of anions, cations, and phytotoxicity of Al ions in acid soils (Soon 1993). The type of Al compound is also responsible for producing different forms of bioavailable Al in soil (Skyllberg 1999). This availability of different forms of Al ions in soil solutions can be

• Nông nghiệp
• Incubation time
• Soil type
• Soil aluminum chemistry
• Al sensitive wheat seedlings
• Wheat seedlings in Podosol
• Journal of Zoology
• Northern Bald Ibis
• Female residence time of incubation
• Male residence time of incubation
• Weeks of incubation
• Geronticus eremita