Effect of hexazinone applied alone and in combination on the photosynthetic efficiency of Panicum maximum

Planta Daninha

Araldi, R.¹  Velini, E.D.¹  Trindade, M.L.B.¹  Girotto, M.¹  UNESP¹  Carbonari, C.A¹ 

关键词: fluorescence;    electron flow;    photo-system;    fluorometer.;   

DOI  :  10.1590/S0100-83582012000200013

学科分类：农业科学（综合）

来源: Sociedade Brasileira da Ciencia das Plantas Daninhas (S B C P D) / Brazilian Society of Herb Science

【 摘 要 】

This work aimed to evaluate the speed and intensity of action of hexazinone applied alone and in combination with other photo-system II inhibitors on the photosynthetic efficiency of Panicum maximum in post-emergence. The assay consisted of six treatments: hexazinone (250 g ha-1), tebuthiuron (1.0 kg ha-1), hexazinone + tebuthiuron (125 g ha-1+ 0.5 kg ha-1), diuron (2,400 g ha-1), hexazinone + diuron (125 + 1,200 g ha-1), metribuzin (1,440 g ha-1), hexazinone + metribuzin (125 + 720 g ha-1) and a control. The experiment was conducted in a randomized design with four replications. After treatment application, plants were transported to a greenhouse with controlled temperature and humidity, remaining there throughout the experimental period, during which electron transport rate and visual analysis of intoxication were assessed. The fluorometer evaluation was performed at intervals of01, 02, 06, 24, 48, 72, 120, and168 hours after application, and visual assessments at 3 and 7 days after application. The results showed differences in the treatments, with the application ofthe herbicide diuron slowly reducing electron transport, compared with the other herbicides, and presenting a synergistic effect when mixed with hexazinone. Early intoxication of P. maximum plants was verified with the use ofthe fluorometer, after application of the photo-system IIinhibitors, alone and in combination.

【 授权许可】

Unknown