Changes in di ethylene triamine penta acetic acid extractable zinc copper iron and manganese in 2 alkaline calcareous soils followed by sucrose application

Hussain, F.; Rashid, A.

Pakistan Journal of Scientific and Industrial Research 21(2): 80-82


ISSN/ISBN: 0030-9885
Accession: 004907238

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The levels of organic matter (2,4 and 8 ton/ha) employed in this study have little or no effect on Zn or Cu status of the soils. However, the decomposition of sucrose seems to have important practical considerations as far as the status of Fe and Mn is concerned. Solubility of Fe increased considerably with sucrose additions. Mn solubility in Kamalia soil (heavy texture, high buffering capacity), however, increased only slightly and only at the highest level of sucrose treatment. The increase in Mn solubility of Thikriwala soil, a light textured soil, at the highest level of sucrose addition, was much greater. Mn extractability at this level of sucrose application was approximately 5-fold higher than the soils to which no sucrose was added. The increase in the dissolution of Fe and Mn compounds by sucrose decomposition was probably brought about by the reducing state induced by activated microbes and by a reduction in pH due to organic acid production. The increase in Mn in sandy soils may be detrimental to plant Fe nutrition.