Fertility evaluation of zinc content and comparison of reaction and efficiency of various zinc sources in southern Iraq soil
1988
Al-Abdalla, N.I.A.
Studies were conducted in (22) calcareous soils to evaluate the efficiency of various extractants (acid mixture; EDTA+NH4OAC; EDTA+(NH4)2CO3; DTPA+NH4HCO3 and DTPA+CACL2) and to find critical levels of soil and plant Zn of corn (Zea mays L.). The content of total Zn for all the soils varied from (8.63-70.89) ppm with the mean value of (42.18) ppm. The order of extractability by the different extractants was EDTA+NH4OACDTPA+CACL2DTPA+NH4HCO3EDTA+(NH4)2CO3acid mixture. The DTPA+CACL2 method gave the best correlation with all growth parameters, suggesting its efficiency for predicting soil available Zn in calcareous soils.
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