Effect of Simulated Acid Rain and Heavy Application of Fertilizers on Two Andisols and Their Effect on Crop Growth(Field Science Center, Environmental Crop Science)

概要

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The effects of simulated acid rain and the heavy application of fertilizers on acidification of allophanic Zao Andisol and non-allophanic Kawatabi Andisol were investigated in two studies. One was carried out using a 21cm height and 16.5cm diameter column, and a rain simulator machine. The other, was done using a stirred-flow reaction system to determine the SO_4^<2-> adsorption capacities of Andisols. For both allophanic and non-allophanic Andisols, the amount of soil extractable SO_4^<2-> increased with depth, but the amount of SO_4^<2-> extracted in Zao soil was much higher than that in Kawatabi soil. The rate of acidification of Kawatabi soil due to acid input was higher than that for Zao soil. The amount of M KC1 extractable aluminium was higher than that of water extractable Al, and increased when soil pH decreased. With fertilizer treatments of Kawatabi soil, we found a significant (P<0.05) reduction of root growth of barley. Amounts of SO_4^<2-> adsorbed in Zao soil were much higher than those in Kawatabi soil, which was more sensitive to acid inputs. The amount of M KC1 extractable Al in Zao soil was lower than that in Kawatabi soil; however, in both soils it increased with a decrease of soil pH. It was suggested that if soil pH of Zao soil decreased to low values, the amount of M KC1 extractable aluminium could be reached to toxic levels for crop growth.Andisolcrop growthheavy fertilizationsimulated acid rain
東北大学の論文
2006-03-31