Nitrogen loss in Brachiaria decumbens after application of glyphosate or glufosinate-ammonium
Nitrogen loss in Brachiaria decumbens after application of glyphosate or glufosinate-ammonium
复制标题
施用草甘膦或草铵膦后斜卧臂形草的氮损失
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
P. Trivelin
中科院分区：
文献类型：
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作者：
V. Damin;H. Franco;M. F. Moraes;A. Franco;P. Trivelin
土壤-植物系统的氮损失可能会受到除草剂施用的影响。为了评估施用除草剂草甘膦和草铵膦后臂形草（Brachiaria decumbens）的氮素损失，在温室中进行了完全随机设计的实验，进行了3个处理和6个重复。处理如下：i)用草甘膦干燥臂形植物； ii)用草铵膦干燥臂形植物； iii) 控制，不使用除草剂。将植物培养在 4 kg 沙土盆中，并用硫酸铵- 15 N (200 mg kg -1 ) 施肥，以量化肥料- N 的分配及其在土壤-植物系统中的回收。与对照相比，用除草剂处理的植物具有较少的氮积累和肥料氮（15 N）的回收较少。在土壤中，施氮处理中 15 N 肥料的回收率最高，可能是由于其他氮化合物流失到土壤中，如根系渗出和根部死亡。对照植物中土壤-植物系统中 15 N-肥料的总回收率高于处理植物中的，这表明除草剂对氮损失的直接作用，尤其是臂形植物的地上部分。
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- 15 N, (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 ( 15 N) relative to the control. In the soil, the greatest recovery of 15 N-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 15 N-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.