Morning glory species interference on the development and yield of soybeans

Pagnoncelli, Fortunato De Bortoli; Trezzi, Michelangelo Muzell; Brum, Betania; Vidal, Ribas Antonio; Portes, Álvaro Fernando; Scalcon, Everton Luiz; Machado, Adriano

doi:10.1590/1678-4499.2016.338

Brasil

home Sumário navigate_before Anterior Atual Seguinte navigate_next

home Sumário

Basic Areas • Bragantia 76 (4) • Oct-Dec 2017 • https://doi.org/10.1590/1678-4499.2016.338 linkcopy

Morning glory species interference on the development and yield of soybeans

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

Plants from the genus ipomoea are among the most important weeds in Brazil. The objective of this study was to determine the impact of different densities of 2 species of Ipomoea (I. grandifolia and I. purpurea) under different environments (counties of Pato Branco and Renascença, Paraná state, Brazil) on soybean biometric variables, yield components and crop yield loss. Field experiments in 2 distinct places were conducted in a randomized block design, where 1 factor consisted of 8 plant densities (0, 2, 4, 6, 8, 10, 15 and 20 plants∙m⁻²), whereas the other factor consisted of the 2 Ipomoea species. Joint analysis of the data was performed considering the factors environment, Ipomoea densities and species. The impact of one Ipomoea plant∙m⁻² was very high, reaching 26%, on average, of species and environments. The maximum soybean yield loss experienced with the Ipomoea density of 20 plants∙m⁻² was close to 80%. The impact of Ipomoea density was more important than the species and environment. This result highlights the importance of correct management of plants of these weed species in soybean crop.

Key words interspecific competition; Ipomoea spp.; Glycine max; biometric variables; yield components

Soil texture			Chemical attributes
Properties	Pato Branco	Renascença	Properties	Pato Branco	Renascença
Properties	Values (%)		Properties	Values^* * 1 Organic matter (gdm-3);
Clay	55.7	78.50	OM¹ * 1 Organic matter (gdm-3);	49.50	48.25
Sand	3	2.40	^P2^O5² 2 Phosphorus (mgdm-3);	14.32	68.46
Silt	41.3	19.10	K₂O³ 3 Potassium (cmolcdm-3);	0.70	0.35
			CEC⁴ 4 Cation exchange capacity;	17.63	12.76
			pH⁵ 5 Soil pH;	5.6	5.10
			H + Al⁶ 6 Exchangeable acidity (cmol dm-3).	5.35	6.21

Environments	Soybean plant height (cm) Species
Environments	I. purpurea	I. grandifolia	Average
Pato Branco	76.52	71.30	73.9 a^* * Means with the same letter do not differ by the Tukey test (p < 0.05). Data represent the average of all Ipomoea densities.
Renascença	64.63	63.19	63.9 b
Average	70.6 a*	672 b

Variable	Treatments	Parameters			R²	MSE	p
Variable	Treatments	A	B	D₅₀	R²	MSE	p
PHT		74.43 (0.99)^ p < 0.01;	0.55 (0.14)^ p < 0.01;	604.54 (525.44)^ns ns Non-significant.	0.90	1.02	<0.01
LA	I. purpurea¹ 1 Three-parameter logistic model; I. grandifolia¹ 1 Three-parameter logistic model;	1,422.76 (84.27)^ p < 0.01; 1,199.64 (62.85)^ p < 0.01;	0.97 (0.24)** 0.50 (0.18)^* * p < 0.05;	16.91 (3.22)** 65.33 (43.78)^ns ns Non-significant.	0.89 0.81	7,714.77 3,992.08	< 0.01 < 0.01
LA	Pato Branco¹ 1 Three-parameter logistic model; Renascença¹ 1 Three-parameter logistic model;	1,464.86 (64.83) 1,132.78 (64.27)^ ** p < 0.01;	2.10 (0.83)* 0.31 (0.12)^* * p < 0.05;	25.02 (4.23)** 6.94 (3.18)^ns ns Non-significant.	0.80 0.91	9,405.11 4,132.06	< 0.01 < 0.01
FLM	Pato Branco¹ 1 Three-parameter logistic model; Renascença¹ 1 Three-parameter logistic model;	26.87 (1.90) 24.19 (1.35)^ ** p < 0.01;	2.06 (1.26)^ns ns Non-significant. 0.29 (0.11)^ns ns Non-significant.	24.76 (6.51)^* * p < 0.05; 7.21 (3.52)^ns ns Non-significant.	0.60 0.91	7.94 1.82	0.04 < 0.01
FSM	I. purpurea ¹ 1 Three-parameter logistic model; I. grandifolia ¹ 1 Three-parameter logistic model;	43.49 (1.75) 38.26 (0.86)^ ** p < 0.01;	0.67 (0.16) 0.63 (0.12)^ ** p < 0.01;	41.82 (13.42)* 88.70 (30.57)^* * p < 0.05;	0.90 0.94	3.15 0.77	< 0.01 < 0.01
FSM	Pato Branco¹ 1 Three-parameter logistic model; Renascença¹ 1 Three-parameter logistic model;	46.16 (1.35)^ p < 0.01; 33.30 (1.73)^ p < 0.01;	2.26 (1.28)^ns ns Non-significant. 0.20 (0.11)^ns ns Non-significant.	36.47 (13.80)^* * p < 0.05; 40.29 (44.75)^ns ns Non-significant.	0.67 0.89	4.74 3.01	0.02 < 0.01
FPH	Pato Branco: I. purpurea² 2 Three-parameter sigmoidal model; The values in parentheses indicate the standard error of the parameter estimate;	23.58 (1.09)^ p < 0.01;	5.65 (2.86)^ns ns Non-significant.	-6.62 (3.36)^ns ns Non-significant.	0.77	0.94	0.01
	Pato Branco: I. grandifolia² 2 Three-parameter sigmoidal model; The values in parentheses indicate the standard error of the parameter estimate;	29.32 (3.23)^ p < 0.01;	9.93 (4.33)^ns ns Non-significant.	-4.33 (1.56)^* * p < 0.05;	0.90	0.98	< 0.01
	Renascença: I. purpurea² 2 Three-parameter sigmoidal model; The values in parentheses indicate the standard error of the parameter estimate;	2757 (1.02)^ p < 0.01;	8.74 (1.68)^ p < 0.01;	-5.64 (0.84)^ p < 0.01;	0.97	0.18	< 0.01
	Renascença: I. grandofolia² 2 Three-parameter sigmoidal model; The values in parentheses indicate the standard error of the parameter estimate;	25.55 (0.46)^ p < 0.01;	5.77 (0.85)^ p < 0.01;	-4.89 (0.77)^ p < 0.01;	0.98	0.15	< 0.01

Variable	Environment and	Equation parameters			R²	MSE	P
Variable	weed species	A	B	D₅₀	R²	MSE	P
PPP¹	Pato Branco: I. purpurea	42.99 (2.32)^3/**	0.64 (0.13)**	8.45 (1.87)**	0.93	5.41	< 0.01
	Pato Branco: I. grandifolia	39.86 (3.21)**	0.51 (0.26)^ns	51,15 (44.77)^ns	0.65	10.40	0.03
	Renascença: I. purpurea	34.56 (2.85)**	0.87 (0.25)*	10.54 (2.80)*	0.86	8.40	< 0.01
	Renascença: I. grandofolia	39.89 (3.65)**	0.42 (0.20)^ns	6.94 (3.88)^ns	0.80	13.31	< 0.01
BPP¹		1.67 (0.01)**	0.53 (0.04)**	124.55 (21.97)**	0.99	0.0002	< 0.01
TGM¹		156.07 (2.75)**	' 0.59 (0.11)**	170,27 (77.25)^ns	0.94	7.81	< 0.01

Environments	Beans per pod		Seed mass (g∙1,000 seeds⁻¹)
Pato Branco	1.63	a*	165.08	a
Renascença	1.16	b	107.93	b

	Equation parameters^* * Hyperbolic equation Y = (A x D) / (D50+D) based on data converted to percentage yield loss in relation to weed-free treatments.			R²	p
	A	D₅₀	i	R²	p
Soybean yield loss (%)	89.23	3.45	25.86	98.47	< 0.01

Species	SoyBean yield loss (%)
Species	Pato Branco		Renascença
I. purpurea	51.49	a^* * Means with the same letter in the column do not differ by the Tukey test (p ≤ 0.05).	57.76	a
I. grandifolia	38.72	b	58.82	b

vertical_align_top file_download show_chart

more_horizclose
- image
- translate
- link
- article
- vertical_align_top
- file_download
- show_chart
- image
- translate
- link
- article

location_on

Instituto Agronômico de Campinas Avenida Barão de Itapura, 1481, 13020-902, Tel.: +55 19 2137-0653, Fax: +55 19 2137-0666 - Campinas - SP - Brazil
E-mail: bragantia@iac.sp.gov.br

rss_feed Acompanhe os números deste periódico no seu leitor de RSS

Acessibilidade / Reportar erro

[TFN01] ^{* 1}
Organic matter (gdm^-3);

[TFN02] ²
Phosphorus (mgdm^-3);

[TFN03] ³
Potassium (cmolcdm^-3);

[TFN04] ⁴
Cation exchange capacity;

[TFN05] ⁵
Soil pH;

[TFN06] ⁶
Exchangeable acidity (cmol dm^-3).