Occurrence of Weeds in Areas Submitted to Tillage Managements for Soybean Cultivation in the Cerrado of Roraima

MENEZES, P.H.S.; ALBUQUERQUE, J.A.A.; SMIDERLE, J.O.; MEDEIROS, R.D.; ALVES, J.M.A.; GIANLUPPI, D.

doi:10.1590/S0100-83582019370100079

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Article • Planta daninha 37 • 2019 • https://doi.org/10.1590/S0100-83582019370100079 copy

Occurrence of Weeds in Areas Submitted to Tillage Managements for Soybean Cultivation in the Cerrado of Roraima

Ocorrência de Plantas Daninhas em Áreas Submetidas a Manejos de Preparo do Solo para Cultivo de Soja no Cerrado de Roraima

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT:

Weeds from soils submitted to different tillage managements were identified in two consecutive years of soybean cultivation in the Cerrado of Roraima. The study was carried out in three areas: native area (NA), mechanically mowed native area (MA), and limed area (LA). A descriptive analysis of the phytosociological parameters relative density (Drr), relative frequency (Frr), relative dominance (Dor), importance value index (IVI), and index of relative importance (IRI) was performed to interpret the results. The weed similarity index (SI) was also calculated in the assessed areas. The highest relative frequencies were observed for Trachypogon plumosus (40.92%), Bulbostylis capillaris (18.52%), and Spermacoce capitata (18.33%) in the native area and T. plumosus (24.69%), Cyperus flavus (24.69%), and S. capitata (18.52%) in the mowed area. Among the species collected in the areas, the botanical families Poaceae, Cyperaceae, Fabaceae, and Rubiaceae are the most representative. The used managements contribute to the emergence of new species of spontaneous plants and weeds in the Cerrado of Roraima.

Keywords:
Glycine max; phytosociological parameters; savanna

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[1] * Corresponding author: <anchietaufrr@gmail.com>

Depth	pH (H₂O)	C	P	Ca²⁺+Mg²⁺	K⁺	Al³⁺	H+Al	SB	CEC	m	V	Dens	Sand	Silt	Clay
(cm)	pH (H₂O)	(g kg^-1)	(mg kg^-1)	(cmol_c dm^-3)						(%)		(kg m^-3)	(g kg^-1)
0-10	4.6	9.3	0.5	0.1	0.1	0.8	2.4	0.2	2.6	82.4	6.3	1.438	624	74	302
10-30	4.8	8.4	0.2	0.1	0.0	0.7	2.1	0.1	2.2	86.7	5.1	1.356	618	60	322

Class	Family	Scientific name	Common name	Propagation type	Growth habit	Life cycle
Magnoliopsida	Fabaceae Fabaceae Convolvulaceae Pedaliaceae Rubiaceae Rubiaceae	Aeschynomene denticulata	Jointvetch	Seed	Herbaceous	Annual
		Chamaecrista diphylla	Twoleaf sensitive pea	Seed	Herbaceous	Annual
		Evolvulus anagalloides	Dwarf morning glory	Seed	Prostate herbaceous	Annual
		Sesamum indicum	Sesame	Seed	Herbaceous	Annual
		Spermacoce capitata	Baldhead false buttonweed	Seed	Herbaceous	Annual
		Borreria verticillata	Shrubby false buttonweed	Seed	Herbaceous	Annual
Liliopsida	Cyperaceae Cyperaceae Poaceae Poaceae Poaceae	Bulbostylis capillaris	Densetuft hairsedge	Seed	Herbaceous	Annual
		Cyperus flavus	Inflatedscale flatsedge	Seed/rhizome	Herbaceous	Perennial
		Digitaria horizontalis	Jamaican crabgrass	Seed	Herbaceous	Perennial
		Trachypogon plumosus	Crinkleawn grass	Seed	Herbaceous	Perennial
		Panicum dichotomiflorum	Fall panicgrass	Seed	Herbaceous	Annual

Native area
Scientific name	DM* (g)	Drr (%)	Frr (%)	Dor (%)	IVI (%)	IVR (%)
Aeschynomene denticulata	2.26	3.2	11.11	0.45	14.78	4.93
Bulbostylis capillaris	1.1	67.7	18.52	4.45	90.71	30.24
Chamaecrista diphylla	4.8	3.2	11.11	0.95	15.28	5.09
Spermacoce capitata	22.4	6.5	18.33	8.85	33.63	11.21
Trachypogon plumosus	72.1	19.4	40.92	85.31	154.58	48.53
Total	102.66	100.00	100.00	100.00	300.00	100.00
Mowed area
Aeschynomene denticulata	8.68	1.59	7.41	5.94	14.94	4.98
Cyperus flavus	1.2	44.44	24.69	23.08	92.22	30.74
Chamaecrista diphylla	1.6	1.59	6.17	1.10	8.86	2.95
Evolvulus anagalloides	1.6	1.59	6.17	1.10	8.86	2.95
Digitaria horizontalis	0.7	39.68	12.35	11.81	63.84	2.28
Spermacoce capitata	0.6	4.76	18.52	1.26	24.54	8.8
Trachypogon plumosus	20.35	6.35	24.69	55.72	86.76	28.92
Total	34.73	100.00	100.00	100.00	300.00	100.00
Limed area
Aeschynomene denticulata	2.1	2.94	8.70	0.98	12.61	6.04
Borreria verticillata	5.49	14.71	17.39	12.93	45.03	16.09
Chamaecrista diphylla	0.53	1.47	4.35	0.12	5.94	4.10
Cyperus flavus	0.95	57.35	26.09	8.73	92.17	41.84
Panicum dichotomiflorum	66.12	1.47	4.35	15.58	21.39	4.10
Sesamum indicum	41.99	8.82	21.74	59.35	89.91	12.78
Spermacoce capitata	1.1	13.24	17.39	2.31	32.94	15.06
Total	118.28	100.00	100.00	100.00	300.00	100.00