YIELD AND BIOMETRIC CHARACTERISTICS OF MAIZE SUBMITTED TO PLANT POPULATION AND TRINEXAPAC-ETHYL DOSES

PRICINOTTO, LUIZ FERNANDO; ZUCARELI, CLAUDEMIR; FERREIRA, ANDRÉ SAMPAIO; SPOLAOR, LEANDRO TEODOSKI; FONSECA, INÊS CRISTINA DE BATISTA

doi:10.1590/1983-21252019v32n311rc

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Agronomia • Rev. Caatinga 32 (3) • Jul-Sep 2019 • https://doi.org/10.1590/1983-21252019v32n311rc copy

YIELD AND BIOMETRIC CHARACTERISTICS OF MAIZE SUBMITTED TO PLANT POPULATION AND TRINEXAPAC-ETHYL DOSES¹ 1 Paper extracted from the doctoral thesis of the first author.

PRODUTIVIDADE E CARACTERÍSTICAS BIOMÉTRICAS DO MILHO SUBMETIDO A POPULAÇÕES DE PLANTAS E DOSES DE TRINEXAPAC-ETHYL

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

The use of plant growth regulators in agriculture can alter the morphology of corn plants, increasing crop yield due to the possibility of increasing the population. This study aimed to evaluate the effects of plant populations associated with trinexapac-ethyl (TE) doses on the biometric characteristics of shoot and grain yield of contrasting corn cultivars regarding plant architecture. Experiments were conducted in the field during two seasons with the hybrids 2B710 HX (flat leaf) and TL Status (erect leaf) in a randomized block design (four replications) and treatments in a 5 × 5 factorial scheme, with five plant populations (40, 60, 80, 100, and 120 thousand plants ha⁻¹) and five TE doses (0, 100, 200, 300, and 400 g a.i. ha⁻¹) applied by foliar spraying at the V6 stage. Plant height, ear insertion height, stem diameter, leaf area index, and grain yield were evaluated. An increment in population increases plant height, ear insertion height, and the leaf area index, but reduces stem diameter. The plant growth regulator TE reduces plant height and ear insertion height. The interaction between plant population and TE favors corn yield, with the highest values observed in combinations of 93.4 thousand plants ha⁻¹ with a dose of 176 g ha⁻¹ of TE for the hybrid 2B710 HX and 92.2 thousand plants ha⁻¹ with a dose of 251 g ha⁻¹ of TE for the hybrid Status TL.

Keywords:
Self-shading; Plant density; Growth regulator; Zea mays L

Parameter	PH	EH	SD	LAI	GY
	t-value
	2B710 HX - 2010/2011
Intercept	60.42***	33.87***	30.12***	−2.74**	8.32***
Population	6.05***	6.27***	−4.41***	16.67***	16.04***
Population²	−4.15***	−4.23***	2.49*	−11.28***	−14.17***
Dose	2.08*	1.99*	1.91*	−0.43^ns	2.68**
Dose²	−5.12***	−4.17***	−0.76^ns	−0.65^ns	−4.07***
Population × dose	−3.59***	−3.07**	−2.34*	1.00^ns	−0.04^ns
	2B710 HX - 2011/2012
Intercept	25.05***	16.38***	36.35***	10.18***	8.49***
Population	2.62*	1.5*	−5.59***	46.78***	12.60***
Population²	−1.95^ns	−0.39^ns	2.97**	−3.35^ns	−11.95***
Dose	−0.34*	1.1*	2.03^ns	3.72***	1.36^ns
Dose²	−1.04^ns	−3.04^ns	−1.09^ns	−2.41^ns	−2.56*
Population × dose	−1.46^ns	−1.96^ns	−2.08^ns	0.86^ns	−0.03^ns
	Status TL - 2010/2011
Intercept	80.25***	53.47***	44.38***	5.23***	38.72***
Population	10.16***	10.85***	−8.14***	8.61***	9.43***
Population²	−10.39***	−9.84***	4.33***	−3.05**	−9.28***
Dose	−8.14***	−9.35***	−1.70^ns	−2.06^ns	3.06**
Dose²	−3.56^ns	−2.03^ns	1.95^ns	1.94^ns	−6.10***
Population × dose	0.76^ns	0.60^ns	0.06^ns	1.59^ns	3.62***
	Status TL - 2011/2012
Intercept	25.95***	21.32***	29.72***	2.87**	34.54***
Population	1.79^ns	2.40^ns	−5.56***	5.11***	3.96***
Population²	−1.93^ns	−2.27^ns	2.97**	−0.74^ns	−2.62*
Dose	−1.30^ns	−1.35^ns	−1.91^ns	−0.94^ns	10.66***
Dose²	3.50^ns	2.04^ns	1.91^ns	0.28^ns	−11.39***
Population × dose	−3.04^ns	−2.49^ns	0.20^ns	1.29^ns	−5.15***

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[1] ^* Corresponding author: ANDRÉ SAMPAIO FERREIRA - andresampaioferreira@gmail.com

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YIELD AND BIOMETRIC CHARACTERISTICS OF MAIZE SUBMITTED TO PLANT POPULATION AND TRINEXAPAC-ETHYL DOSES1 1 Paper extracted from the doctoral thesis of the first author.

PRODUTIVIDADE E CARACTERÍSTICAS BIOMÉTRICAS DO MILHO SUBMETIDO A POPULAÇÕES DE PLANTAS E DOSES DE TRINEXAPAC-ETHYL

ABSTRACT

YIELD AND BIOMETRIC CHARACTERISTICS OF MAIZE SUBMITTED TO PLANT POPULATION AND TRINEXAPAC-ETHYL DOSES¹ 1 Paper extracted from the doctoral thesis of the first author.