Brachiaria enrichment with selenium-coated urea

Faria, Letícia de Abreu; Machado, Marcos Canto; Karp, Felippe Hoffmann Silva; Kamogawa, Marcos Yassuo; Abdalla Filho, Adibe Luiz; Azevedo, Ricardo Antunes de; Abdalla, Adibe Luiz

doi:10.1590/0103-8478cr20170630

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SOIL SCIENCE • Cienc. Rural 48 (6) • 2018 • https://doi.org/10.1590/0103-8478cr20170630 copy

Brachiaria enrichment with selenium-coated urea

Enriquecimento de Brachiaria com ureia revestida com selênio

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT:

Selenium (Se) fertilization in grazing to biofortification of animal products have been carried out in low Se soils. The objective of this study was to increase the Se content in the biomass of Brachiaria spp.with urea coated with Se. The experiment was performed in a typical Hapludox soil under greenhouse conditions. A completely randomized block design with four replicates in a factorial structure with two cuts and six Se doses (0, 10, 20, 40, 80, and 160gha^-1) was used. The Brachiaria brizantha demonstrated the absence of changes in higher harmful doses without modifying the activity of glutathione peroxidase enzyme. We concluded that enrichment of Brachiaria brizantha with coated urea is obtained with 34.5gha^-1of Se.

Key words:
coated fertilizer; pasture fertilization; sodium selenate

Universidade Federal de Santa Maria Universidade Federal de Santa Maria, Centro de Ciências Rurais , 97105-900 Santa Maria RS Brazil , Tel.: +55 55 3220-8698 , Fax: +55 55 3220-8695 - Santa Maria - RS - Brazil
E-mail: cienciarural@mail.ufsm.br

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[1] E-mail: leticiadeabreufaria@gmail.com. ^*Corresponding author.

Se doses (g ha1)	Roots	Dry matter production	Tiller	GSH	Total Glutathione	GSSG
Se doses (g ha1)	------------------------g pot-1--------------------------			------------mM g-1 MF----------------
0	47.3	21.7	31.1	2.96	4.26	1.29
10	42.4	21.8	32.8	3.46	4.74	1.41
20	41.2	22.4	31.4	3.32	5.03	1.70
40	43.9	19.6	30.9	3.46	4.75	1.31
80	31.6	24.5	31.1	2.50	3.82	1.31
160	36.9	21.0	29.9	3.34	5.44	2.09
P	ns	ns	ns	ns	ns	ns
---------------------------------------------------Cuts (days)-----------------------------------------------------------------
30 days	-	22.7 a	24.8 a	2.77	3.51	0.78
60 days	-	20.9 a	37.6 a	3.66	6.10	2.44
P	-	ns	ns	*	*	*
Se doses x cuts	ns	ns	ns	ns	ns	ns
C.V. (%)	32.7	18	9.9	29.7	27.1	42.7

Se doses (gha-1)	-------------------Leaves---------------		------------Stem + sheath------------		Roots	Se recovery by plant (%)
Se doses (gha-1)	30 days	60 days	30 days	60 days	60 days	Se recovery by plant (%)

0	0.037	0.002	0.001	0.019	0.25	0
10	0.436	0.106	0.171	0.044	0.27	27.0
20	1.179	0.202	0.544	0.134	0.25	35.7
40	2.549	0.421	1.031	0.303	0.29	35.1
80	6.102	1.244	3.521	0.669	0.79	50.1
160	11.09	1.694	6.234	0.753	1.20	41.50
	Y=0.0712x-0.1121	Y=0.0112x+0.0316	Y=0.0408x-0.1935	Y=0.005x+0.0634	Y=0.0065x+0.1743	Y=0.0869x+32.492
R²	0.9956	0.9478	0.9861	0.8754	0.9500	0.3832
P	*		*		*	*
C.V. (%)	33		28		26	15