Use of Visible Spectral Index and Soybean Plant Variables to Study Hidden Nematicide Phytotoxicity

Ernane Miranda Lemes, Maria Amélia dos Santos, Lísias Coelho, Samuel Lacerda de Andrade, Aline dos Santos Oliveira, Igor Diniz Pessoa, João Paulo Arantes Rodrigues Cunha
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引用次数: 0

Abstract

Significant crop losses are due to plant-parasitic nematodes. Nematicides are expensive and potentially toxic to men, the environment, and plants. This study evaluated the hidden phytotoxicity effects of nematicides in soybeans. Two soybean cultivars (8473RSF and M7198IPRO) were evaluated with five nematicide treatments (biological, cadusaphos, abamectin, fluensulfone, and an untreated control) for changes in chlorophylls, biometrics, and spectral (TGI visible spectral index captured with a smartphone camera) variables to determine and anticipate the identification of plant stresses. Evaluations occurred 33, 47, and 66 days after sowing (DAS). The a/b chlorophyll proportion was greatest for M7198IPRO and cadusaphos. The chlorophyll variables did not present significant interactions or differences at 47 DAS, indicating that possible nematicide effects were transient and should be evaluated earlier than 33 DAS. Leaf area, leaf mass, and shoot mass were smaller for 8473RSF and outstanding for abamectin and fluensulfone. The response of the spectral index did not present significant interaction among the factors; however, at 33 and 47 DAS, the index was low for 8473RSF and lowest for cadusaphos only at 33 DAS. The correlations between the spectral index and other variables were significant and moderate for soybean total leaf area. Although no apparent phytotoxicity symptoms caused by nematicides were observed, the visible vegetation index generated using a smartphone camera can still improve crop management solutions.
利用可见光谱指数和大豆植物变量研究杀线虫剂的隐性植物毒性
植物寄生线虫是造成重大作物损失的原因。杀线虫剂价格昂贵,而且对人类、环境和植物都有潜在的毒性。本研究评价了杀线虫剂对大豆的潜在植物毒性作用。研究了两个大豆品种(8473RSF和M7198IPRO)在五种杀线虫剂处理(生物、cadusaphos、阿维菌素、氟砜和未经处理的对照)下叶绿素、生物特征和光谱(用智能手机相机捕获的TGI可见光谱指数)变量的变化,以确定和预测植物胁迫的鉴定。在播种后33、47和66天进行评估。a/b叶绿素比例以M7198IPRO和cadusaphos最高。叶绿素变量在47 DAS没有表现出显著的相互作用或差异,表明可能的杀线虫效应是短暂的,应该在33 DAS之前进行评估。8473RSF的叶面积、叶质量和茎质量较小,阿维菌素和氟砜的效果较好。各因子对光谱指数的响应不存在显著的交互作用;然而,在33和47 DAS时,8473RSF的指数最低,而只有在33 DAS时,cadusaphos的指数最低。大豆总叶面积光谱指数与其他变量的相关性为极显著和中等。虽然没有观察到杀线虫剂引起的明显植物毒性症状,但使用智能手机相机生成的可见植被指数仍然可以改善作物管理解决方案。
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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CiteScore
4.70
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