Initial performance of maize in response to humic acids and plant growth-promoting bacteria

Melo, Raphael Oliveira de; Oliveira, Hend Pereira de; Silveira, Klever Cristiano; Baldotto, Lílian Estrela Borges; Baldotto, Marihus Altoé

doi:10.1590/0034-737X201865030007

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Soil Science and Plant Nutrition • Rev. Ceres 65 (03) • May-Jun 2018 • https://doi.org/10.1590/0034-737X201865030007 copy

Initial performance of maize in response to humic acids and plant growth-promoting bacteria¹ Project funded by FAPEMIG.

Desempenho inicial do milho em resposta a ácidos húmicos e bactérias promotoras de crescimento vegetal

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

Seed treatment with inoculants based on plant growth-promoting bacteria (PGPB) or the application of humic acids (HA) may increase the productivity of plants of agricultural interest. The hypothesis of this work is that it is possible to combine the effect of plant growth promoting characteristic of HA with the inoculation of PGPB selected strains in the treatment of maize seeds. Thus, providing superior responses than in single applications of both in the initial maize development. To meet this purpose, we conducted isolated application of HA or PGPB inoculation of Burkholderia gladioli and Rhizobium cellulosilyticum, and the combined application of PGPB and HA for treatment of maize seeds. At the end of the experiment (45 days after germination), the plants were evaluated biometrically, nutritionally and a bacteria count was performed in plants using the Most Probable Number technique. The results showed that it is possible to combine the effects of HA with the inoculation of selected strains of PGPB, obtaining superior responses to the isolated application of both. Thus, the use of HA-based bio-stimulants in combination with PGPB is positive and complementary compared to inputs generally used in the treatment of maize seeds.

Keywords:
humic substances; diazotrophic bacteria; soil organic matter

Universidade Federal de Viçosa Av. Peter Henry Rolfs, s/n, 36570-000 Viçosa, Minas Gerais Brasil, Tel./Fax: (55 31) 3612-2078 - Viçosa - MG - Brazil
E-mail: ceres@ufv.br

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[1] ^*Corresponding author: liestrelaborges@gmail.com; lilian.estrela@ufv.br

Treatments	PH	NL	WWL	LL	SD	FMAP	RFM	DMAP	RDM	TDM
	cm	cm			g/plant
Control	27.80 a	4.60 a	2.66 a	55.94 a	0.47 a	8.64 a	6.14 a	1.05b	0.71 a	1.75 b
HA¹	28.20 a	4.50 a	2.35 a	53.40 a	0.47 a	8.96 a	5.70 a	1.11b	0.61 a	1.79 b
Bac 1²	31.69 a	4.86 a	2.66 a	59.86 a	0.56 a	11.19 a	5.90 a	1.36ab	0.60 a	1.99 ab
Bac 2³	31.82 a	4.70 a	2.71 a	62.40 a	0.60 a	12.98 a	7.34 a	1.46ab	0.89 a	2.35 ab
Bac 1+HA	30.00 a	4.86 a	2.56 a	56.24 a	0.57 a	11.61 a	6.44 a	1.39ab	0.80 a	2.19 ab
Bac 2+HA	32.00 a	4.90 a	2.60 a	62.70 a	0.60 a	13.81 a	7.54 a	1.80a	0.95 a	2.75 a
CV (%)	10.73	7.85	11.57	8.79	11.21	22.81	15.40	21.24	19.78	19.28

Treatments	Content			Amount
	N	P	K	N	P	K
	%			mg per plant
Control	1.80 a	0.20 a	5.56 a	20.74 a	2.17 b	59.02 b
HA¹	2.09 a	0.21 a	5.57 a	15.57 a	2.34 b	62.60 b
Bac 1²	1.12 a	0.21 a	5.91 a	21.66 a	2.83 ab	81.03 ab
Bac 2³	1.10 a	0.21 a	5.54 a	21.68 a	3.04 ab	81.78 ab
Bac 1 + HA	1.93 a	0.19 a	5.51 a	14.02 a	2.83 ab	76.47 ab
Bac 2 + HA	0.94 a	0.21 a	5.58 a	14.02 a	3.72 a	100.46 a
CV(%)	14.70	0.96	4.97	22.76	20.92	21.15

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Initial performance of maize in response to humic acids and plant growth-promoting bacteria1 Project funded by FAPEMIG.

Desempenho inicial do milho em resposta a ácidos húmicos e bactérias promotoras de crescimento vegetal

ABSTRACT

Initial performance of maize in response to humic acids and plant growth-promoting bacteria¹ Project funded by FAPEMIG.