Selectivity of post-emergent herbicides for weed control in birdsfoot trefoil crops

IF 0.8 Q3 Agricultural and Biological Sciences

Planta Daninha Pub Date : 2020-01-01 DOI:10.1590/s0100-83582020380100055

Bruno M. Silva, Renan R. Zandoná, Roberto C. A. Neto, Jonathan Torchelsen, D. Agostinetto

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Abstract

and the lack of selective herbicides registered for birdsfoot trefoil crops affect their development and limit their productivity. Objective: This study aimed to evaluate selectivity of post-emergent herbicides for weed control in birdsfoot trefoil crops. Methods: Experiments were carried out in a greenhouse and on a field, in both vegetative and reproductive development stages of birdsfoot trefoil crops. Treatments were composed of post-emergent herbicides recommended for soybean, corn and garlic cultivation. Phytotoxicity (PHYTO), plant height (HEI), shoot dry matter (SDM) and root dry matter (RDM) were evaluated. Data were submitted to the analysis of variance and when means were significant, they were compared by the Duncan’s Test (p≤0.05). In order to determine post-emergent herbicides which were selective to the crop, those that provided PHYTO below or equal to 15% were recommended, since they did not significantly interfere with morphological variables HEI, SDM and RDM, by comparison with the control. Results: Unlike results found in the vegetative stage, birdsfoot trefoil plants were more tolerant to phytotoxic effects of herbicides imazethapyr, chlorimuron-ethyl, cloransulam-methyl and fomesafen in the reproductive stage. The variables were negatively affected by the herbicides bentazon, glyphosate and carfentrazone-ethyl, with PHYTO higher than 40% at 20 days after treatment in

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鸟足三叶草苗期后除草剂的选择性研究

此外，缺乏为鸟足三叶草作物登记的选择性除草剂影响了它们的发育并限制了它们的生产力。目的:评价苗期除草剂对三叶草杂草的选择性。方法:分别在温室和田间对鸟足三叶作物进行营养发育和生殖发育两个阶段的试验。采用大豆、玉米和大蒜种植推荐的苗期除草剂。对植物毒性(PHYTO)、株高(HEI)、茎干物质(SDM)和根干物质(RDM)进行了评价。数据进行方差分析，当均值显著时，采用Duncan检验(p≤0.05)进行比较。为了确定对作物有选择性的后苗期除草剂，与对照相比，推荐使用PHYTO低于或等于15%的除草剂，因为它们对形态变量HEI、SDM和RDM的干扰不显著。结果:与营养期不同，鸟足三叶草在繁殖期更能耐受除草剂吡虫唑、氯脲-乙基、氯兰舒兰-甲基和氟美沙芬的植物毒性作用。除草剂苯达松、草甘膦和卡芬曲酮-乙基对各指标均有负向影响，处理后20 d时PHYTO高于40%

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来源期刊

Planta Daninha Agricultural and Biological Sciences-Plant Science

自引率

0.00%

发文量

审稿时长

16 weeks

期刊介绍： Planta Daninha is a scientific journal published by the Brazilian Society of Weed Science (SBCPD - Sociedade Brasileira da Ciência das Plantas Daninhas). Papers submitted for publication must be sent through an electronic system, on http://www.scielo.br/pd. Works may be written in Portuguese, English, or Spanish, and will be accepted after being reviewed and approved by the Editorial Board. Only papers that have not been published or submitted for publication in other media will be accepted. Articles in Portuguese will be translated to English after being properly corrected and authorized by the authors. Planta Daninha has with goal to publish genuine technical-scientific papers and literature reviews from a critical perspective on Biology, weed management, and related topics.