Solution: culture trials were carried out to study the influence of increasing doses of aluminium on the uptake of Al, P. Ma. Mn. Fe and dry matter yield of maize crop. The results revealed that excessive doses of aluminium accumulated in the roots. The uptake of P by the roots was actually enhanced by Al application. The indications were that phosphorus gets precipitated with aluminium in the 100:s. Al-application did. not increase Al concentration in the shoot, whereas the phosphorus concentration gradually increased. Poor growth beyond 25 ppm of Al was clearly seen. This was partly due to direct injury of Al on the root hairs and partly due to poor uptake of essential nutrients like Fe and Mn.
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Tamil Nadu Agricultural University
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Tamil Nadu, India.
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