Open AccessThe influence of hexazinone on carbon dioxide evolution and mineralization of nitrogen, phosphorus and sulfur in a forest soil
Author(s) -
D. G. Maynard
Publication year - 1993
Publication title -
canadian journal of soil science/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/cjss93-045
Subject(s) - hexazinone , chemistry , mineralization (soil science) , nitrogen , nitrogen cycle , carbon dioxide , agronomy , environmental chemistry , soil water , nutrient , nitrification , incubation , phosphorus , zoology , environmental science , soil science , biology , biochemistry , organic chemistry , weed control
The effect of hexazinone (applied as Velpar L.) on carbon dioxide (CO 2 ) evolution, nitrogen (N), phosphorus (P), and sulfur (S) mineralization in a surface organic layer (L–H horizons) of a forest soil was followed during a 150-d laboratory incubation. Hexazinone was applied at recommended field rates equivalent to 2 and 4 kg a.i. ha −1 and at a higher rate, 8 kg a.i. ha −1 . A bioassay determined that hexazinone at 4 and 8 kg a.i. ha −1 affected the root and shoot biomass of oats for up to 63 d after application. Hexazinone had no effect on CO 2 evolution, ammonification, nitrification or net S mineralization in the L–H horizons. An increase in extractable P was found in the hexazinone-treated soils at the end of the incubation. Hexazinone applied at recommended field rates of 2 and 4 kg a.i. ha −1 would have little direct impact on nutrient-cycling processes in the L–H horizons of mixed-wood cutovers. Key words: Hexazinone, carbon dioxide evolution, nitrogen, phosphorus, sulfur, forest soils