Evaluation of universal extractants for determination of selected micronutrients from soil

Abstract

ABSTRACT.A study was carried out with the objective of identifying the most suitable universal extractant for determination of selected micronutrients from soils. Composite surface soil samples (0-20 cm) were collected from Eastern Harargie Zone (Babile and Haramaya Districts), Wolaita Zone (Damot Sore, Boloso Bombe, Damot Pulasa and Humbo Districts) and Dire Dawa Administrative Council by purposive sampling. The treatments were arranged in completely randomized design (CRD) with three replications at Haramaya University Soil Laboratory. The results showed that among the universal extractants examined for the determination of available Fe, Cu and Zn, the highest correlation coefficients (r = 0.95), (r = 0.99) and (r = 0.97) at (p < 0.001) were found between DTPA and AB-DTPA for available Fe, Cu and Zn, respectively. Therefore, AB-DTPA universal extractant can easily be adopted as a soil testing method for the determination of available Fe, Cu and Zn in some selected soils of Ethiopia. Similarly, the concentration of available Mn determined by DTPA method was significantly correlated with the amount determined by tested universal extractants. The highest correlation coefficients were found between DTPA and 0.01 M CaCl2 (r = 0.90), DTPA and 0.01 M BaCl2 (r = 0.87), DTPA and 0.02 M SrCl2 (r = 0.86), DTPA and 0.1 M BaCl2 (r = 0.89) and DTPA and AB-DTPA (r = 0.85). However, considering the use of universal extractant, AB-DTPA could be the most suitable universal extractant for the determination of available Mn in soils of the studied areas as well. Therefore, AB-DTPA extractant is considered to be superior and the most suitable universal extractant for determination of available Fe, Cu, Mn and Zn in soil of the studied areas.

Suitability of Multinutrient Extractants for Evaluation Of Available Soil Zinc for Tomato Nutrition Of Karnataka Soils

“…The concentration of available zinc extracted by EDTA was more than that of DTPA and it might be due its strong chelating capacity of forming complexation and decreases adsorption of zinc on clay particles by EDTA which results in increasing the solubility of zinc in soils. These results are in conformity with the findings of Bibiso et al (2015).…”

Mycorrhizal associations and soil properties of native Allanblackia stuhlmannii stands in the Eastern Usambara Mountains, Tanzania

“…() for mostly acid Ethiopian soils and which was judged excessive. This was also the case for Mn whereas the Zn concentration was somewhat lower although still higher than found for soils of >pH 6 (Bibiso et al ., ). This may suggest that A. stuhlmannii , being adapted to the acid soil conditions within its native environment, has a relatively high demand for one or more of these elements or low efficiency in accessing them and prone to deficiency at somewhat higher pH (George et al ., ).…”

Multinutrient Extraction – Need of the Hour – A Review

“…The highest correlation coefficients were found between DTPA and 0.01 M CaCl 2 (r = 0.90), DTPA and 0.01 M BaCl 2 (r = 0.87), DTPA and 0.02 M SrCl 2 (r = 0.86), DTPA and 0.1 M BaCl 2 (r = 0.89) and DTPA and AB-DTPA (r = 0.85). (Bibiso et al, 2015). Thus AB-DTPA works as a most suitable universal extractant for the determination of available manganese in soils.…”

“…Therefore, these procedures are more time consuming, laborious, cumbersome, and costly because of more use of chemicals, glassware, and energy. In order to over-S383 come these issues, multi-nutrient extractants offer a suitable alternative, as more than one nutrient can be extracted in one go (Bibiso et al, 2015). Thus, a method of extracting multi nutrients simultaneously for the diagnosis of available soil nutrients should be developed (Nakatsuka et al, 1988).…”