Ismail, M. ; G.T.I. Abou EI-Hag and Y.R.I. Soliman( 2010). DISTRIBUTION MODE OF,SOME ESSENTIAL MICRONUTRIENTS FOR PLANT AS RELATED TO THE DIFFERENT TAXONOMIC UNITS OF SOILS DEVELOPED ON THE WEST NILE DELTA AREA, EGYPTEgypt . j .of appl.sci .,25 . (12A)
Abstract: The current work aims to study the status of some essential micronutrients for plant, i.e., Fe, Mn, Zn and Cu as related to the different taxonomic units of soil sub-great groups that could be belong to the soils developed on the western part of the Nile Delta, Egypt. By using soil association's map of the studied area as well as the determination of the soil total contents for these micronutrients and their available fractions, it could be defined the relationships between both micronutrient contents for and some soil variables. The obtained results_,· could be summarized as follows:
a. Soil total contents of Fe, Mn, Zn and Cu ranged 3150-66500, 150- n00, 20-80 and '15-42 p.g g-'\, respectively. The soils of Typic Haplotorrerts are characterized by the highest contents of these micrbnutrients, while soils of Typic Torripsamments and Aquic Haplocalcids attain the lowest ones. Also, the obtained data of the statistical parameters i.e., the values of weighted mean (W), trend (T) and specific range (R) of the total micronutrient contents under study were computed and interpreted in terms of soil genesis and formation processes for the studied area.' . .
b. Soil content of the available fraction (DTPA-extractable) for each .of Fe, Mn, Zn and Cu ranged 1.1-15.5, 1.5-9.9,0.5-4.1 and 0.5-8.1 p.gg-\ respectively. In general, the critical limits of DTPA-extractable micronutrients could be defined as an adequate for the plant needs in the surface layers or the studied soils, except of the available contents of Fe and Zn that were. found in the taxonomic soil units of Typic .Torripsamments and Typic Torriorthents at a marginal level for both nutrients.
c. The obtained data of the statistical analyses for the simple correlation coefficients between soil content of either total or DTPA-extractable micronutrients and some soil variables as affecting factors were discussed as well as their significance interpretations;
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