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首页> 外文期刊>Southern Journal of Applied Forestry >Growth, survival and physiological effects of hexazinone and sulfometuron methyl applied overtop of longleaf pine seedlings
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Growth, survival and physiological effects of hexazinone and sulfometuron methyl applied overtop of longleaf pine seedlings

机译：长叶松树苗上方施用六嗪酮和甲基磺草隆的生长，存活和生理效应

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摘要

A field study was conducted in Santa Rosa County, FL to evaluate the effects of two herbicides, hexazinone and sulfometuron methyl, on longleaf pine seedling (Pinus palustris Mill.) survival, growth, and physiological functions over a 2 yr period (2001-2002). An old-field site was planted with 1-yr-old container-grown seedlings in January 2001, and herbicides were band-applied overtop of the seedlings in April 2001. Hexazinone rates were 0.56 and 1.12 kg ai/ha, and the sulfometuron methyl rates were 0.21 and 0.42 kg ai/ha. Volumetric soil moisture was also measured in May, July, August, and October in each treatment. At the end of the first growing season (2001), survival was not improved by any of the herbicide applications. However, root collar diameter (RCD) increased for hexazinone applied at 0.56 and 1.12 kg ai/ha, and sulfometuron methyl applied at 0.42 kg ai/ha at the end of the first growing season compared to the control. At the end of the second growing season, RCD was 28.7, 30.9, 30.5, 32.1, and 33.3 mm for the control, sulfometuron methyl applied at 0.21 and 0.42 kg ai/ha, and hexazinone applied at 0.56 and 1.12 kg ai/ha, respectively. Also, the percentage of seedlings out of the grass stage at the end of the study was 72, 74, 79, 81, and 89% for the control, sulfometuron methyl applied at 0.21 and 0.42 kg ai/ha, and hexazinone applied at 0.56 and 1.12 kg ai/ha, respectively. Foliar responses, such as net photosynthesis, stomatal conductance, and transpiration were measured in October 2001. There was no evidence of herbicide injury on foliar physiological functions relative to the control seedlings 6 months after treatment. During 2001, soil moisture was related to hexazinone and sulfometuron methyl application rates in May and July, but not in August or October. Averaged across May and July, soil moisture increased from 5.4% in the control to 7.6 and 7.5% in the highest hexazinone and sulfometuron methyl treatments, respectively. Based on seedling survival, growth, and herbicide costs, the most effective treatment was hexazinone applied at 0.56 kg ai/ha.
机译：在佛罗里达州圣罗莎县进行了一项野外研究，以评估两种除草剂六嗪酮和甲基磺草隆甲基甲酰胺对长叶松树幼苗（Pinus palustris Mill。）在2年内（2001-2002）的存活，生长和生理功能的影响）。 2001年1月在一个旧田地上种植了1年龄的容器生长的幼苗，并于2001年4月在该幼苗的顶上带了除草剂。六嗪酮的施用量为0.56和1.12 kg ai / ha，而磺草隆甲基捕捞量分别为0.21和0.42 kg ai / ha。在每个处理的5月，7月，8月和10月也测量了土壤的体积水分。在第一个生长期（2001年）结束时，任何除草剂的使用均无法提高其存活率。然而，与对照相比，在第一个生长季结束时，分别以0.56和1.12 kg ai / ha施用六嗪酮的根颈直径（RCD）增加，而以0.42 kg ai / ha施用甲磺胺磺隆的甲基根。在第二个生长季节结束时，对照的RCD为28.7、30.9、30.5、32.1和33.3 mm，磺胺甲磺隆以0.21和0.42 kg ai / ha施用，六嗪酮以0.56和1.12 kg ai / ha施用，分别。另外，在研究结束时，对照组草皮期外的幼苗百分比为72％，74％，79％，81％和89％，施用甲磺胺甲隆的剂量分别为0.21和0.42 kg ai / ha，施用六嗪酮的比例为0.56和1.12 kg ai / ha。在2001年10月测量了叶片的反应，例如净光合作用，气孔导度和蒸腾作用。相对于对照幼苗，处理6个月后没有证据表明除草剂对叶片的生理功能有损害。 2001年期间，土壤水分与5月和7月的六嗪酮和磺胺嘧啶甲基施肥量有关，而与8月或10月无关。五月和七月的平均水平分别为对照最高的土壤水分，分别从最高控制的5.4％增至最高的7.6zin和7.5％的磺胺磺隆处理。根据幼苗的存活，生长和除草剂成本，最有效的处理方法是以0.56 kg ai / ha施用六嗪酮。

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