TY - JOUR
T1 - Effects of temperature on extractable manganese and distribution of manganese among soil fractions
AU - Tong, Y.
AU - Rengel, Z.
AU - Graham, R. D.
N1 - Funding Information:
We thank Mr. N. H. Robinson for ICP analyses and Mrs. T. O. Fowles and Mr. C. Huang for helping with facilities used in the experiments. This work was supported by Department of Primary Industry and Energy (Canberra) and Grains Research and Development Corporation. Continuous support from Australian Research Council (Z.R.) is gratefully acknowledged.
PY - 1995
Y1 - 1995
N2 - Fertiliser manganese (Mn) does not have good residual Value in calcareous soils in southern Australia. The interaction of biotic and abiotic factors determining availability of fertiliser Mn is not well understood. Effects of autoclaving and temperature of moist incubation on DTPA (diethylenetriamine-pentaacetic acid)-extractable Mn and the distribution of Mn among soil fractions was tested in a sandy, calcareous Wangary soil. In the topsoil receiving 10 or 40 mg Mn/kg, higher incubation temperature (26°C) accelerated a decrease in DTPA-Mn and weakly adsorbed Mn during 0–14 d incubation compared with the lower temperature (15/10°C, 12 h each) regardless of whether soil was autoclaved or not. In a Wangary soil mixed in 1:1 ratio of topsoil to subsoil and supplemented with Mn, higher temperature during soil incubation resulted in higher DTPA-Mn compared to the lower incubation temperature after 36 d. The decrease in weakly adsorbed Mn with incubation time was mainly due to: (i) Mn fixation by chemisorption on calcite, and (ii) Mn oxidation by soil microflora; the higher the incubation temperature, the quicker the fixation. Autoclaving of the soil fertilised with Mn caused the amounts of Mn in various soil fractions to remain almost constant throughout the 24-d incubation period regardless of the incubation temperature. The present study indicates that the reduction of Mn availability in soils results when dry non-autoclaved soil is re-moistened and incubated at relatively higher temperatures as occurs in the autumn in Mediterranean climates such as that of South Australia.
AB - Fertiliser manganese (Mn) does not have good residual Value in calcareous soils in southern Australia. The interaction of biotic and abiotic factors determining availability of fertiliser Mn is not well understood. Effects of autoclaving and temperature of moist incubation on DTPA (diethylenetriamine-pentaacetic acid)-extractable Mn and the distribution of Mn among soil fractions was tested in a sandy, calcareous Wangary soil. In the topsoil receiving 10 or 40 mg Mn/kg, higher incubation temperature (26°C) accelerated a decrease in DTPA-Mn and weakly adsorbed Mn during 0–14 d incubation compared with the lower temperature (15/10°C, 12 h each) regardless of whether soil was autoclaved or not. In a Wangary soil mixed in 1:1 ratio of topsoil to subsoil and supplemented with Mn, higher temperature during soil incubation resulted in higher DTPA-Mn compared to the lower incubation temperature after 36 d. The decrease in weakly adsorbed Mn with incubation time was mainly due to: (i) Mn fixation by chemisorption on calcite, and (ii) Mn oxidation by soil microflora; the higher the incubation temperature, the quicker the fixation. Autoclaving of the soil fertilised with Mn caused the amounts of Mn in various soil fractions to remain almost constant throughout the 24-d incubation period regardless of the incubation temperature. The present study indicates that the reduction of Mn availability in soils results when dry non-autoclaved soil is re-moistened and incubated at relatively higher temperatures as occurs in the autumn in Mediterranean climates such as that of South Australia.
UR - http://www.scopus.com/inward/record.url?scp=0028979109&partnerID=8YFLogxK
U2 - 10.1080/00103629509369421
DO - 10.1080/00103629509369421
M3 - Article
AN - SCOPUS:0028979109
SN - 0010-3624
VL - 26
SP - 1963
EP - 1977
JO - Communications in Soil Science and Plant Analysis
JF - Communications in Soil Science and Plant Analysis
IS - 11-12
ER -
