Tolerance of grain sorghum to 2,4-D applied in post-emergence

Planta Daninha

Universidade Estadual de Maringá¹  FESURV¹  Guerra, N¹  Oliveira Jr, R.S¹  Barroso, A.L.L¹  Dan, H.A¹  Dan, L.G.M¹  Feldkircher, C¹  FESURV, Rio Verde¹  Universidade Estadual de Maringá, Maringá¹ 

关键词: phenological stage;    Sorghum bicolor;    synthetic auxins;    selectivity.;   

DOI  :  10.1590/S0100-83582010000400011

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 】

Grain sorghum is one of the major species cultivated as a winter crop in savannah areas in Brazil. Although 2,4-D is currently used on this crop, little has been done to understand crop susceptibility as a function of its vegetative stage at spraying. The present work was carried out to determine the selectivity of 2,4-D applied in post-emergence on grain sorghum. The cultivar AG-1040 was grown in 10 dm-3 pots under greenhouse conditions. The experiment was set up in a completely randomized design, in a factorial scheme 5 x 3, composed by five rates of 2,4-D (0, 210; 420; 840 and 1.608 g ha-1), applied at three phenological stages: three, five and nine completely expanded leaves. Visual crop injuries were more intense when the herbicide was applied at the earlier stages of sorghum development. However, the main negative effects related to plant productivity and lodging were observed in herbicide applications carried out at later stages of crop development.

【 授权许可】

Unknown