Straw interference in the emergence of talquezal seeds from different origins

IF 0.8 Q3 Agricultural and Biological Sciences Planta Daninha Pub Date : 2020-01-01 DOI:10.1590/s0100-83582020380100059
S. R. Marchi, Ricardo F. Marques, Rodrigo M. Souza, Cristina F. Justo, C. C. Martins
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引用次数: 5

Abstract

Background: Talquezal (Paspalum virgatum L.) has become one of the main pasture weeds due to its association with the Urochloa brizantha death syndrome, a disease that causes the progressive death of clumps of susceptible grasses in patches, which leads to weed colonization and pasture degradation. Understanding the weed emergence pattern is essential in decision making for management strategies. Objective: Thus, this study aimed to evaluate the emergence pattern of talquezal seedlings according to its origin and the amount of straw covering the soil. Methods: The experiment was carried out in a greenhouse in a completely randomized design, with six replications and treatments arranged in an 8 × 3 factorial scheme with eight amounts of Urochloa brizantha straw covering the seeds (0, 0.5, 1.0, 2.0, 4.0, 6.0, 8.0, and 10.0 ton ha-1) and three collection sites (Rondonópolis, Redenção, and Cacoal). The effect of the origin and amount of straw was evaluated by the percentage of emergence, relative emergence frequency, mean emergence time, emergence synchrony, and emergence speed index of seedlings obtained over 35 days after sowing. Results: Talquezal seeds showed high seedling emergence vigor regardless of their origin under amounts of straw lower than 4.0 ton ha-1. Conclusions: The result suggests that the amounts of U. brizantha straw higher than 4.0 ton ha-1 on the soil surface, the lower is the percentage of Talquezal seedling emergence.
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不同来源的talquezal种子萌发过程中的秸秆干扰
背景:Talquezal (Paspalum virgatum L.)已成为主要的牧草杂草之一,因为它与尿斑草死亡综合征有关,尿斑草死亡综合征是一种导致斑块中易感草团逐渐死亡的疾病,导致杂草定植和牧场退化。了解杂草的出现模式对制定管理策略至关重要。目的:根据talquezal的产地和覆盖土壤的秸秆数量,评价talquezal幼苗的出苗规律。方法:采用完全随机设计,在温室内进行试验,6个重复,按8 × 3因子设计,8个处理量(0、0.5、1.0、2.0、4.0、6.0、8.0和10.0 ton ha-1)覆盖8个种子,3个采集点(Rondonópolis、reden o和Cacoal)。通过播种后35 d的幼苗出苗率、相对出苗率、平均出苗率、出苗率同步性和出苗率指数来评价秸秆来源和用量的影响。结果:在低于4.0 t hm -1的秸秆用量下,不同产地的Talquezal种子均表现出较高的出苗活力。结论:结果表明,土壤表面喷施玉米秸秆量大于4.0 t hm -1时,Talquezal苗出苗率越低。
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来源期刊
Planta Daninha
Planta Daninha Agricultural and Biological Sciences-Plant Science
自引率
0.00%
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0
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.
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