Associations Between Herbicides and Glyphosate in Agronomic Performance of RR2 Intact Soybean

CESCO, V.J.S.; ALBRECHT, A.J.P.; RODRIGUES, D.M.; KRENCHINSKI, F.H.; ALBRECHT, L.P.

doi:10.1590/S0100-83582018360100015

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Article • Planta daninha 36 • 2018 • https://doi.org/10.1590/S0100-83582018360100015 copy

Associations Between Herbicides and Glyphosate in Agronomic Performance of RR2 Intact Soybean

Associações de Herbicidas com Glyphosate no Desempenho Agronômico da Soja Intacta RR2

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT:

The Roundup Ready (RR) soybean was developed for weed control with the use of glyphosate. Some herbicide combinations with glyphosate has been used in weed control and some effects of this practice may be undesirable in the agronomic performance of RR soybean. The present study evaluated the agronomic performance of RR2 intact soybean applied with associations between herbicides and glyphosate at post-emergence, in two experiments conducted in two municipalities in the state of Paraná, Palotina and Marechal Cândido Rondon. This experiment consisted of seven treatments in a randomized block design with four replications, totaling 28 plots for each municipality. The cultivar used in both experiments was Monsoy 6210 Intact RR2 IPROTM. The variables analyzed were: phytotoxicity at 3, 7, 14, 21 and 28 days after application, chlorophyll A, B and total chlorophyll, final height, number of pods, 100 seed weight and yield. Data were analyzed by analysis of variance and Tukey’s test at 5%. There were differences between treatments for phytotoxicity in both locations and differences in yield (Palotina) and final height (Marechal Cândido Rondon). From the data it is understood that some associations of certain herbicides such as lactofen, chlorimuron-ethyl in the glyphosate can potentiating effect cause phytotoxicity and even reduction in productivity.

Keywords:
Glycine max; susceptibility; selectivity; phytotoxicity

Sociedade Brasileira da Ciência das Plantas Daninhas Departamento de Fitotecnia - DFT, Universidade Federal de Viçosa - UFV, 36570-000 - Viçosa-MG - Brasil, Tel./Fax::(+55 31) 3899-2611 - Viçosa - MG - Brazil
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[1] * Corresponding author: <victorcesco@hotmail.com>

Treatment	Comercial doses product ha^-1
Control	0
Glyphosate*	1440
Glyphosate + Fluazifop-p-buthyl**	1440 + 187.5
Glyphosate + Cletodim**	1440 + 108
Glyphosate + Cloransulam methyl**	1440 + 40
Glyphosate + Chlorimuron ethyl**	1440 + 17.5
Glyphosate + Lactofen**	1440 + 180

Soil Analisys
Element	Palotina	Marechal Cândido Rondon
pH (CaCl₂)	5.5	5.6
Aliminum saturation (%)	0	0
Base saturation (%)	58.16	76
Phosphor (Mehlich, mg dm^-3)	44.27	31.61
Sulfur (mg dm^-3)	5.17	7.52
H+Al (cmol_c dm^-3)	2.95	3.02
Calcium (cmol_c dm^-3)	3.14	9.44
Magnesium (cmol_c dm^-3)	0.8	3.09
Potassium (cmol_c dm^-3)	0.16	1.9
Cation exchange capacity (cmol_c dm^-3)	7.05	17.97

Palotina -% Phytotoxicity
Treatment	3 DAA	7 DAA	14 DAA	21 DAA	28 DAA
Control	0.00 A	0.00 A	0.00 A	0.00 A	0.00 A
Gly	0.00 A	12.75 B	4.50 B	0.00 A	0.00 A
Gly + Flu	2.95 B	11.75 B	4.00 B	0.00 A	0.00 A
Gly + Cle	0.00 A	13.00 B	5.25 B	0.00 A	0.00 A
Gly + Clor	5.25 B	12.50 B	5.00 B	0.00 A	0.00 A
Gly + Chlo	10.50 C	36.00 D	19.25 C	0.00 A	0.00 A
Gly + Lact	21.25 D	28.25 C	25.75 D	0.00 A	0.00 A
Mean	5.7	16.32	9.11	0	0
VC (%)	20.81	13.72	11.15	0	0
SMD	3.34	2.37	5.23	0	0
Marechal Cândido Rondon
Control	0.00 A	0.00 A	0.00 A	0.00 A	0.00 A
Gly	3.00 B	10.00 B	0.00 A	0.00 A	0.00 A
Gly + Flu	3.00 B	10.00 B	0.00 A	0.00 A	0.00 A
Gly + Cle	3.00 B	10.00 B	0.00 A	0.00 A	0.00 A
Gly + Clor	3.00 B	12.50 B	0.00 A	0.00 A	0.00 A
Gly + Chlo	16.25 C	37.50 D	27.50 C	0.00 A	0.00 A
Gly + Lact	20.00 D	31.25 C	10.75 B	0.00 A	0.00 A
Mean	6.90	15.9	5.46	0	0
VC (%)	13.71	10.67	20.07	0	0
SMD	2.20	3.96	2.56	0	0

Palotina
Treatment	Height	Number of pods	100 seed weight	Yield
Control	113.81 A	42.65 A	12.74 A	3878.79 A
Gly	112.06 A	39.71 A	13.31 A	3714.39 A
Gly + Flu	113.87 A	43.81 A	13.45 A	3601.51 A
Gly + Cle	114.59 A	40.34 A	13.51 A	3734.09 A
Gly + Clor	113.81 A	40.40 A	13.49 A	3563.63 A
Gly + Chlo	112.06 A	39.25 A	13.47 A	3109.09 A
Gly + Lact	110.28 A	40.34 A	13.25 A	3159.09 A
Mean	112.93	41.16	13.32	3537.23
VC (%)	1.75	13.11	3.18	9.55
SMD	4.62	12.60	0.99	789.34
Marechal Cândido Rondon
Control	121.12 A	51.18 A	12.94 A	3985.08 A
Gly	118.68 AB	48.96 A	12.60 A	3924.40 A
Gly + Flu	116.96 ABC	51.94 A	12.34 A	3960.83 A
Gly + Cle	113.87 BC	49.12 A	13.04 A	4122.55 A
Gly + Clor	117.00 ABC	49.06 A	12.99 A	4323.03 A
Gly + Chlo	111.12 C	49.84 A	13.09 A	3954.49 A
Gly + Lact	111.78 BC	55.59 A	12.94 A	3983.77 A
Mean	115.79	50.81	12.85	4036.31
VC (%)	2.57	14.48	3.55	12.11
SMD	6.95	17.20	1.065	1142.72