Open AccessTHE USE OF CALCIUM NITRATE TO REDUCE PHYTOTOXIN ACCUMULATION DURING CROP RESIDUE DECOMPOSITION
Author(s) -
Bob Farquharson,
R. P. Voroney,
E. G. Beauchamp,
Tony J. Vyn
Publication year - 1990
Publication title -
canadian journal of soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 67
eISSN - 1918-1841
pISSN - 0008-4271
DOI - 10.4141/cjss90-074
Subject(s) - chemistry , calcium nitrate , nitrate , calcium , calcium carbonate , denitrification , environmental chemistry , amendment , nitrite , residue (chemistry) , decomposition , inorganic chemistry , nitrogen , biochemistry , organic chemistry , political science , law
This study examined the effects of calcium carbonate, calcium oxide and calcium nitrate on the production and accumulation of volatile fatty acids (VFAs) and phenolic compounds (PCs) during soybean residue decomposition. Soil amended with calcium compounds, residue and water was incubated for 7 d at 25 °C. Measurements were made of VFAs, PCs, ammonium-N, nitrate-N and pH in a soil water extract. Accumulations of VFAs were significantly reduced by calcium nitrate amendment whereas both calcium carbonate and calcium oxide increased their accumulation. Accumulation of PCs followed the same trend but were not significantly different. The nitrate in the calcium nitrate amendment is suspected of promoting the oxidation of the products of residue decomposition via denitrification, by providing electron acceptors. In addition there was evidence of dissimilatory nitrate reduction to ammonium, which would have contributed to soil buffering capacity and to detoxify accumulations of nitrite. Key words: Volatile fatty acids, phenolic compounds, phytotoxicity, denitrification, dissimilatory nitrate reduction
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