Mycorrhizal Association and Microbial Activity of Soil Cultivated with
               Cassava After Application of Mesotrione and Fluazifop-p-Butyl

Silveira, H.M.; Silva, D.V.; Melo, C.A.D.; Neto, M.D.C.; Saraiva, D.T.; Ferreira, E.A.; Silva, A.A.; Freitas, M.S.

doi:10.1590/0100-83582015000200013

Brasil

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Artigos • Planta daninha 33 (2) • Apr-Jun 2015 • https://doi.org/10.1590/0100-83582015000200013 linkcopy

Mycorrhizal Association and Microbial Activity of Soil Cultivated with Cassava After Application of Mesotrione and Fluazifop-p-Butyl

Associação Micorrízica e Atividade Microbiana do Solo Cultivado com Mandioca após Aplicação do Mesotrione e Fluazifop-p-Butil

Authorship SCIMAGO INSTITUTIONS RANKINGS

Soil is a very heterogeneous environment that allows the establishment of wide range of microorganisms populations, whose balance is affected by biotic and abiotic factors. This study has aimed to assess the effect of doses of mesotrione and fluazifop-p-butyl herbicides and two assessment periods on microbial activity and biomass of soil cultivated with cassava Cacau-UFV cultivar, besides the root colonization by arbuscular mycorrhizal fungi. Two trials were conducted in a protected environment where was realized post-emergence application of mesotrione in the doses of 72, 108, 144 and 216 g ha^-1 and fluazifop-p-butyl in the doses of 100, 150, 200 and 300 g ha^-1, besides a control without application. Soil samples were collected for determination of soil respiratory rate (RR), microbial biomass carbon (MBC), metabolic quotient (qCO₂), and colonization of roots by arbuscular mycorrhizal fungi at the 30 and 60 days after applications (DAA) of the herbicides. Fluazifop-p-butyl increased the RR, MBC and the percentage of cassava roots colonized by mycorrhizal fungi in the assessment performed at 60 DAA. The larger effects of mesotrione on soil microbial indicators were up to 30 DAA, being the changes minimized at 60 DAA. It is concluded that the herbicides alter the soil microbial indicators, with effects dependent of the product, of dose applied and also of the period of assessment.

microbial biomass; arbuscular mycorrhizal fungi; herbicide; Manihot esculenta

Dose¹^/	Fluazifop-p-butyl		Mesotrione
Dose¹^/	30 DAA²^/	60 DAA	30 DAA	60 DAA
	µg CO₂g^-1 soil d^-1
0.00	577.50 B³^/	1200.83 A	577.50 B	1200.83 A
0.50	889.17 B	2612.50 A*	870.83 B	1265.00 A
0.75	641.66 B	2538.33 A*	1127.50 A*	623.33 B*
1.00	755.83 B	1347.50 A	605.00 B	990.00 A
1.50	1127.50 A	1356.66 A	1210.00 A*	880.00 A
CV (%)	23.33		23.14

Dose¹^/	Fluazifop-p-butyl		Mesotrione
Dose¹^/	30 DAA²^/	60 DAA	30 DAA	60 DAA
	µg MBC g^-1soil
0.00	219.99 A³^/	304.63 A	219.99 A	304.63 A
0.50	216.10 B	689.30 A*	335.80 A	411.30 A
0.75	232.70 B	587.70 A*	219.90 B	458.90 A
1.00	279.80 B	632.90 A*	343.50 A	412.40 A
1.50	393.70 A	464.40 A	499.80 A*	216.90 B
CV (%)	29.81		28.01

Dose¹^/	Fluazifop-p-butyl		Mesotrione
Dose¹^/	30 DAA²^/	60 DAA	30 DAA	60 DAA
	µg CO₂µg MBC^-1 d^-1
0.00	0.2123^ns	0.2646	0.2123 A³^/	0.2646 A
0.50	0.3050	0.2670	0.1720 A	0.2250 A
0.75	0.1800	0.2980	0.3790 A	0.0930 B
1.00	0.2040	0.1530	0.1460 A	0.1720 A
1.50	0.1920	0.2200	0.1860 A	0.2750 A
CV (%)	46.54		42.02

Dose¹^/	Fluazifop-p-butyl		Mesotrione
Dose¹^/	30 DAA²^/	60 DAA	30 DAA	60 DAA
	%
0.00	77.30 A³^/	48.68 B	77.30 A	48.68 B
0.50	81.07 A	64.17 B*	63.36 A*	60.13 A
0.75	67.63 A*	64.21 A*	65.95 A*	59.15 A
1.00	63.13 A*	63.81 A*	61.81 A*	50.50 A
1.50	58.34 A*	56.87 A	66.21 A*	44.87 B
CV (%)	9.68		12.06

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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
E-mail: rpdaninha@gmail.com

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[TFN01] ¹
^/ Equivalent to the recommended commercial dose of each herbicide. ^2/ DAA: days after herbicide application. ^3/ Means followed by the same capital letter in the row for each herbicide do not differ by Tukey test (p > 0.05) and followed with * in the column differ from the control of each assessment by Dunnett's test (p > 0.05).