Effects of Sesbania rostrata and Azolla microphylla incorporation on transformation of applied zinc and copper in lateritic rice soils with different flooding regimes |
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| Authors: | B Mandal K Bhattacharya P K Mete L N Mandal |
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| Institution: | (1) Micronutrient Research Laboratory, Department of Agricultural Chemistry and Soil Science, Bidhan Chandra Krishi Viswavidyalaya, Kalyani 741 235, West Bengal, India, Tel. 9133826074; Fax: 9133828460, IN |
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| Abstract: | Fixation of Zn and Cu applied to tropical rice-growing lateritic soils rich in Fe-oxides may be reduced if the soils are
kept flooded for a few days before their application. There may be a further reduction if such flooding is combined with incorporation
of green manures. To investigate this effect, a laboratory experiment was conducted to study the effect of different periods
(0 and 15 days) of preflooding combined with (0 and 0.50% of soil weight) Sesbania rostrata and Azolla microphylla incorporation as green manures on the transformation of applied Zn and Cu in two lateritic rice-growing soils. Recovery of
added Zn/Cu in DTPA (diethylene triamine pentaacetate)-extractable form was always found to be higher when they were applied
after the soils were maintained in a flooded state for 15 days than when applied immediately after flooding; this effect was
more prominent in respect of Cu. Contrary to expectations, green manure incorporation along with preflooding caused a significant
decrease in recovery of Zn/Cu; the effect, however, showed a decreasing trend as incubation progressed. The effect was more
marked with A. microphylla than with S. rostrata, particularly with Cu. Possible causes of such changes and their implications on the Zn/Cu nutrition of rice are discussed.
Received: 7 August 1995 |
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| Keywords: | Azolla microphylla Green manuring Flooding periods Rice soils Sesbania rostrata Zn and Cu transformation |
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