Interference Periods of Weeds in Maize in No-Tillage and Conventional Systems at High Altitudes

IF 0.8 Q3 Agricultural and Biological Sciences

Planta Daninha Pub Date : 2020-01-01 DOI:10.1590/s0100-83582020380100029

E. O. Helvig, K.K.G. Pinheiro, A. Dranca, A. Silva, M. C. Mendes, C. Maciel

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引用次数: 3

Abstract

ABSTRACT: The objective of this study was to determine the coexistence periods of weeds (CTWR = critical timing of weed removal) and control (CWFP = critical weed-free period) in maize crops in no-tillage and conventional systems at high altitudes in southern Brazil. To this end, four experiments were conducted in Guarapuava-Paraná during the 2016/2017 crop season using P2530™ (conventional) and P3271H™ (transgenic genetically modified for glyphosate tolerance) hybrids in no-tillage and conventional systems with crop residues of black oat (Avena strigosa). The experimental design was a randomized complete block with five repetitions. The treatments were divided into periods of CTWR and CWFP for 0, 7, 14, 28, 42, 63, and 126 days after the emergence of crops (DAE). Among the weeds, only eudicotyledonous species predominated throughout the crop cycle in both production systems. The productivity results established for P2530™ and P3271H™ hybrids in a conventional system with the incorporation of straw in the soil indicated a critical period of weed control (CPWC) from 23 to 39 DAE and 23 to 35 DAE, respectively. For direct sowing (no-tillage system) on black oat straw, no CPWC was established, as it required only one single point of control between the periods of 21 to 33 DAE and 23 to 31 DAE for the P2530™ and P3271H™ hybrids, respectively. The direct sowing in black oat straw constituted an efficient strategy to reduce weed interference and the necessity of weed management practices.

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高海拔地区免耕与常规体系玉米杂草干扰期研究

摘要/ ABSTRACT摘要:本研究旨在确定巴西南部高海拔地区免耕和常规体系下玉米作物杂草(CTWR =关键除草时间)与杂草控制(CWFP =关键无杂草期)的共存期。为此，在2016/2017作物季节，在瓜拉普瓦瓦-帕拉纳进行了四项试验，使用P2530™(常规)和P3271H™(抗草甘膦转基因)杂交种，在免耕和常规系统中使用黑燕麦(Avena strigosa)作物残留物。实验设计为随机完全组，重复5次。分别于作物出苗后第0、7、14、28、42、63和126 d (DAE)进行CTWR和CWFP处理。在两个生产系统中，只有苦子叶杂草在整个作物周期中占主导地位。P2530™和P3271H™杂交种在常规土壤中添加秸秆的产量结果表明，23 ~ 39 DAE和23 ~ 35 DAE分别是杂草控制的关键时期。在黑燕麦秸秆上直接播种(免耕系统)时，由于P2530™和P3271H™杂交品种只需要在21 ~ 33 DAE和23 ~ 31 DAE期间进行单点控制，因此不需要建立CPWC。黑燕麦秸秆直接播种是一种有效的减少杂草干扰和杂草管理措施必要性的策略。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.