Influence of phosphorus and zinc application on the availability of zinc copper iron manganese and phosphorus in waterlogged rice soils

Mandal, L.N.; Haldar, M.

Soil Science 130(5): 251-257


ISSN/ISBN: 0038-075X
DOI: 10.1097/00010694-198011000-00004
Accession: 005689656

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Laboratory incubation experiments were conducted with 3 clay loam, lowland rice soils (Haplustalf) to study the effect of applying 3 different levels of P (0, 50 and 100 ppm) and Zn (0, 5 and 10 ppm), in all possible combinations, on the changes in DTPA-extractable Zn, Cu, Fe and Mn and Bray's 2 extractable P in soil. Applying P decreased the content of DTPA-extractable Zn, Cu, Fe, and Mn in soils, the rate of decrease gradually declining with the progress of the incubation period. The depressive effect of P on extractable Zn content was more prominent in respect of soil native Zn than of the applied one. Application of Zn also depressed the content of extractable Cu, Fe, and P, but increased that of extractable Mn. The decrease in the uptake of Zn or P, Cu and Fe by rice, resulting from the application of P or Zn as reported by others, was atrributed at least partly to the decrease in the availability of these elements in soil.