Selectivity of ammonium-glufosinate applied alone or in mixture with pyrithiobac sodium in transgenic LL® cotton

Planta Daninha

Arantes, J.G.Z.¹  Braz, G.B.P.¹  Takano, H.K.¹  Franchini, L.H.M.¹  Constantin, J.¹  Raimondi, M.A.¹  Oliveira Jr, R.S.¹  Biffe, D.F.¹  UEM¹ 

关键词: Gossypium hirsutum;    crop injury;    GS inhibitor;    ALS-inhibitor;    tank mixture.;   

DOI  :  10.1590/S0100-83582012000400020

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 】

Due to the recent introduction of transgenic cotton varities with resistance to ammonium-glufosinate (LL®) in Brazil, there is a lack of information related both to the selectivity of sequential reapplications of ammonium-glufosinate and to tank mixture with other herbicides. This work aimed to evaluate the selectivity of sequential applications of ammonium-glufosinate isolated or in associations with pyrithiobac-sodium in LL® cotton. A field experiment was installed in a randomized block design with eight replicates. Treatments were arranged in a factorial scheme (3x3)+1. The first factor consisted of herbicide treatments as follows: ammonium-glufosinate (500 g ha-1), ammonium-glufosinate + pyrithiobac-sodium (500 + 42 g ha-1 and 500 + 56 g ha-1). The second factor was the number of sequential post-emergence applications (one, two, or three), and the additional treatment was a non-applied check. All treatments were manually kept free of weeds throughout the crop cycle. Associating pyrithiobac-sodium to ammonium-glufosinate increased initial crop injury although no significant injury differences were found two weeks after application. Cotton fiber quality was not affected by any herbicidal treatment. Use of isolated ammonium-glufosinate was selective to LL® cotton up to three sequential post-emergence applications. LL® Cotton yield was also sustained after one application of ammonium-glufosinate + pyrithiobac-sodium, with no effects on crop yield.

【 授权许可】

Unknown