亚历山大草对玉米的干扰及经济危害程度

IF 0.8 Q3 Agricultural and Biological Sciences

Planta Daninha Pub Date : 2020-01-01 DOI:10.1590/s0100-83582020380100045

F. Frandoloso, L. Galon, G. Concenço, E. Rossetto, F. Bianchessi, C. O. Santin, C. T. Forte

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引用次数: 2

摘要

摘要:本研究旨在评价杂草对玉米作物的干扰，并确定其经济损失程度。玉米密度分别为2.60、3.10、3.65、4.00和4.80株m-1，每株密度处理10个草居群。以植物种群、叶面积、土壤盖度和地上部干质量为侵染指标。草茎干质量对矩形夸张模型有较好的调整性，该模型能较好地估计杂草干扰对籽粒产量的损失。玉米播种密度2.60;平均3.10株m-1和3.65株m-1在亚历山大草的存在下具有更强的竞争力。玉米密度2.60;3.10和3.65株m-1增加了经济损失水平，证明在种群较高时采用亚历山大草控制措施是合理的。玉米密度为4.00 ~ 4.80株m-1时，NDE值为1.58 ~ 9.37株m-2，与亚历山大草的竞争较弱。

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Interference and Level of Economic Damage of Alexandergrass on Corn

ABSTRACT: The objective of this work was to evaluate the interference and to determine the level of economic damage (NDE) of the weed when infesting the corn crop. Treatments were composed by corn densities (2.60, 3.10, 3.65, 4.00 and 4.80 plants m-1) and 10 Alexandergrass populations for each crop seeding density. The population of plants, leaf area, soil cover and shoot dry mass of Alexandergrass were evaluated as indicator of infestation. Shoot dry mass of Alexandergrass presents better adjustment to the model of rectangular hyperbole, and losses of grain yield due to interference of the weed were satisfactorily estimated by this model. Corn sowing densities of 2.60; 3.10 and 3.65 plants m-1 in average, were more competitive of all evaluated variables in the presence of Alexandergrass. Corn densities of 2.60; 3.10 and 3.65 plants m-1 increase the level of economic damage, justifying the adoption of control measures of Alexandergrass when in higher populations. NDE values ranged from 1.58 to 9.37 plants m-2 at the densities of 4.00 and 4.80 maize plants m-1, which were less competitive with Alexandergrass.

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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.