Abstract
Glyphosate with an equivalent concentration of either 0, 2.16 or 8.64 kg/hm2 was sprayed on to cellulosic materials before burying in two soil types; peat (soil I) and sandy clay loam (soil II). Alternatively the soils were sprayed with 0, 20 or 150 ppm of the herbicide before burying the cellulosic material either immediately or after preincubation for 4 weeks. In soil I, the increase in glyphosate concentrations substantially reduced the decomposition of cellulosic material regardless of the method of application employed. Glyphosate at 8.64 kg/hm2 reduced the mass loss of the treated substrate by 83%. However, cellulose decomposition in soil preincubated for 4 weeks before burying was affected almost to the same extent as the untreated control. Glyphosate stimulated cellulose decomposition when substrates were buried in soil II. Mass loss in soil treated with 150 ppm increased by about 100% while when glyphosate was sprayed directly to the substrate (at 8.64 kg/hm2), the loss was about 25%.
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