Summary
A pot experiment was conducted with two rice varieties grown under flooded conditions to evaluate five chemical extractants,viz: 1N NH4OAc (pH 4.6), 0.01M EDTA-1M (NH4)2CO3 (pH 8.6), 0.05N HCl, 0.01M CaCl2 and 0.2M MgSO4 for extraction of ‘available’ Zn and Cu. Soil Zn and Cu extracted (a) from dry soils before puddling and (b) from wet soils at four and eight week after transplanting were correlated with plant Cu and Zn contents. All extractants gave significant correlations with plant Zn. Highest correlation was obtained with NH4OAc followed by HCl. Zinc extracted from dry soils correlated significantly with that from wet soils. Extractable Zn decreased slightly from zero to four weeks after flooding but increased subsequently. Ammonium acetate, HCl and EDTA extracted approximately equal amounts of Zn.
The EDTA was most suitable for Cu followed by NH4OAc and HCl. Although EDTA extracted more Cu than the other extractants, the generally low ‘r’ values obtained suggested a need for further experimentation.
Zinc concentration in plants did not vary significantly with age but Cu concentration declined from fourth to eighth week after transplanting.
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Selvarajah, N., Pavanasasivam, V. & Nandasena, K.A. Evaluation of extractants for Zn and Cu in paddy soils. Plant Soil 68, 309–320 (1982). https://doi.org/10.1007/BF02197936
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DOI: https://doi.org/10.1007/BF02197936