Nitrogen loss in Brachiaria decumbens after application of glyphosate or glufosinate-ammonium
DOI:
https://doi.org/10.1590/S0103-90162008000400012Keywords:
15N, ammonium exchange, Gramineae, herbicidesAbstract
Nitrogen losses from the soil-plant system may be influenced by herbicide applications. In order to evaluate N loss in brachiaria (Brachiaria decumbens) after application of the herbicides glyphosate and glufosinate-ammonium, an experiment was carried out in a greenhouse as a completely randomized design, with three treatments and six replicates. Treatments were as follows: i) desiccation of brachiaria-plants with glyphosate; ii) desiccation of brachiaria-plants with glufosinate-ammonium; and iii) control, without herbicide application. The plants were cultivated in 4 kg pots of sandy soil and fertilized with ammonium sulfate- 15N, (200 mg kg-1) in order to quantify the allocation of the fertilizer-N and its recovery in the soil-plant system. Plants treated with the herbicides had less N accumulation and less recovery of the fertilizer-N (15N) relative to the control. In the soil, the greatest recovery of 15N-fertilizer occurred for treatments where N was applied, possibly due to the occurrence of other N compound losses to the soil, like root exudation and root death. The total recovery of 15N-fertilizer in the soil-plant system was higher in the control than in the treated plants showing the direct action of the herbicides on nitrogen loss, and especially by the above-ground part of the brachiaria plants.Downloads
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Published
2008-01-01
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Section
Soils and Plant Nutrition
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All content of the journal, except where identified, is licensed under a Creative Common attribution-type BY-NC.How to Cite
Nitrogen loss in Brachiaria decumbens after application of glyphosate or glufosinate-ammonium . (2008). Scientia Agricola, 65(4), 402-407. https://doi.org/10.1590/S0103-90162008000400012