Weed management of cotton under no-tillage

Planta Daninha

Berger, P.G.¹  APTA¹  Silva, M.P.¹  Cecon, P.R.¹  Ferreira, L.R.¹  Freitas, R.S.¹  Silva, A.C.¹  Universidade Federal de Viçosa¹  UEMG¹  APTA, Votuporanga¹ 

关键词: S-metolachlor;    triflosysulfuron-sodium;    Gossypium hirsutum;    selectivity.;   

DOI  :  10.1590/S0100-83582006000200017

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 】

The objective of this study was to evaluate the efficiency of the herbicides Smetolachlor in pre-emergence and trifloxysulfuron-sodium applied 18 days after crop emergence (DAE), under no-tillage systems. A factorial scheme (4 x 4) + 1 was used in a completely randomized block design, with four replications. The first factor consisted of four S-metolachlor doses (0, 384, 768 and 1.152 g ha-1) and the second of four trifloxysulfuron-sodium doses (0.0; 2.625; 5.250; and 7.875 g ha-1), plus a control kept weeded throughout the cotton cycle. The weeds were evaluated 25, 45 and 60 DAE. The following weed species were present in the area: Alternanthera tenella, representing over 80% of the total, Bidens spp., Tridax procumbens, Acanthospermum hispidum, Ipomoea grandifolia, Digitaria horizontalis, Eleusine indica, and Commelina benghalensis. S-metolachlor controlled these species with low efficiency. The best control was obtained with the combination of S-metolachlor at 1.152 g ha-1 with trifloxysulfuron-sodium at 7.875 g ha-1, which controlled more than 90% of A. tenella and other dicotyledonous weeds until 60 DAE. This control was still not sufficient to clear the ground for the cotton harvest. The combinations S-metolachlor at 384 and 768  g  ha1 with trifloxysufuron-sodium at 7.875  g  ha-1 and S-metolachlor at 1.152  g  ha-1 with trifloxysulfuron-sodium in the doses 5.250 and 7.875  g  ha-1 provided similar yields for the weeded control.

【 授权许可】

Unknown