Phenological Sensitivity of Two Maize Cultivars to Trinexapac-Ethyl

MENDES FAGHERAZZI, M.; SOUZA, C.A.; STEFEN, D.L.V.; ZANESCO, P.R.; JUNKES, G.V.; COELHO, C.M.M.; SANGOI, L.

doi:10.1590/S0100-83582018360100012

Acessibilidade / Reportar erro

Brasil

Español English

sumário « anterior atual seguinte »

Sumário

Article • Planta daninha 36 • 2018 • https://doi.org/10.1590/S0100-83582018360100012 copy

Phenological Sensitivity of Two Maize Cultivars to Trinexapac-Ethyl

Sensibilidade Fenológica de Dois Cultivares de Milho a Trinexapac-Ethyl

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT:

In Brazilian agriculture there are few reports on trinexapac-ethyl (TE) effects on maize plant lodging management. This study aimed to evaluate the effects of sequential application of TE sprayed on different plant growth stages of maize using the simple hybrid P30F53HR and the variety SCS 154 Fortuna. Experiments were carried out in a greenhouse in the 2013 and 2014 harvests. Plants were grown singly in 5L pots filled with 75% soil and 25% substrate. The experimental design was a randomized complete block with four replications. The following treatments were performed: (T1) control (no application of growth retardant); (T2) application at V2 (100 g a.i. ha-1); (T3) sequential application of 100 g a.i. ha-1 at V2 plus V3; (T4) sequential application of 100 g a.i. ha-1 at V2+V3+V4; (T5) single application of 300 g a.i. ha-1 at V4; (T6) sequential application of 100 g a.i. ha-1 at V2+V3+V4+V5; (T7) sequential application of 100 g a.i. ha-1 at V2+V3+V4+V5+V6 and (T8) sequential application of 100 g a.i. ha-1 at V2+V3+V4+V5+V6+V7. The some morphological characteristics of the two maize genotypes changed in response to TE treatment. From stage V4 onwards, maize plant height showed signs of sensitivity to the growth retardant. Plants in T8 (TE applied over V2 to V7) were more sensitive to TE with over 45% reduction in plant height compared with application T7 (applied from V2 to V6). This response was similar in both maize genotypes, thus indicating that plants are highly sensitive to TE after the V6 stage.

Keywords:
Zea mays L.; growth regulator; morphological characteristics

Sociedade Brasileira da Ciência das Plantas Daninhas Departamento de Fitotecnia - DFT, Universidade Federal de Viçosa - UFV, 36570-000 - Viçosa-MG - Brasil, Tel./Fax::(+55 31) 3899-2611 - Viçosa - MG - Brazil
E-mail: rpdaninha@gmail.com

Acompanhe os números deste periódico no seu leitor de RSS

[1] * Corresponding author: <clovis.souza@udesc.br>

SV⁽¹⁾	DG⁽²⁾	PH	EIH	SD	NL	TT	BY
SV⁽¹⁾	DG⁽²⁾	(cm)	(cm)	(mm)	(n^o.)	(days)	(g)
MS to P30F53HR
Season (S)⁽³⁾	1	10353.1**	4795.6**	28.6*	72.3**	248.1**	172017.6**
Treatment (T)⁽⁴⁾	7	4373.3**	2393.9**	14.3*	1.5 ns	15.1**	3553.7**
S x T	7	1035.5**	808.8**	6.9 ns	0.8 ns	6.5**	3103.5**
Mean		133.4	87.1	21.7	17.4	76.6	142.4
VC%		8.6	11.8	10.3	4.8	1.9	20.5
MS to SCS 154 Fortuna
Season (S)	1	20700.1**	9776.3**	35.6**	90.3**	31.6 ns	264453.1**
Treatment(T)	7	7274.2**	2819.6**	38.6**	2.3 ns	49.9**	4001.2**
S x T	7	566.9 ns	552.7 ns	5.5 ns	0.8 ns	34.3**	4149.1**
Mean		145.3	93.4	21.6	17.8	78.5	162.3
VC%		11.7	17.4	10.1	6.6	3.8	18.3

P30F53HR
SV⁽¹⁾	Season⁽²⁾	T1⁽³⁾	T2	T3	T4	T5	T6	T7	T8
PH ⁽⁴⁾ (cm)	2013	189.5 aA	144.7 aB	149.7 aB	150.0 aB	160.2 aB	140.5 aB	138.0 aB	96.5 aC
PH ⁽⁴⁾ (cm)	2014	141.5 bA	145.0 aA	137.0 aA	119.2 bB	101.5 bC	146.2 aA	99.7 bC	75.5 bD
EIH (cm)	2013	130.0 aA	88.7 aB	109.5 aA	97.0 aB	111.7 aA	83.0 aB	89.7 aB	56.0 aC
EIH (cm)	2014	89.2 bA	94.0 aA	98.2 aA	78.2 bB	63.0 bB	90.0 aA	65.5 bB	49.0 aC
TT (days)	2013	79.5aB	77.2 aC	77.7 aC	77.0 aC	77.5 aC	79.5 aB	78.0 aC	81.7 aA
TT (days)	2014	73.0 bB	73.5 bB	73.0 bB	73.5 bB	75.2 bA	74.5 bB	77.2 aA	76.7 bA
BY (g)	2013	178.7 aB	176.0 aB	205.0 aB	165.0 aB	290.0 aA	179.2 aB	187.5 aB	172.5 aB
BY (g)	2014	96.2 bA	92.5 bA	95.0 bA	87.5 bA	92.5 bA	93.7 bA	86.2 bA	80.7 bA
SCS 154 Fortuna
PH (cm)	2013	172.0 aA	176.0 aA	206.0 aA	173.0 aA	151.0 aB	175.0 aA	154.0 aB	98.0 aC
PH (cm)	2014	153.0 aA	155.0 aA	160.0 bA	137.0 bA	114.0 bB	134.0 bA	85.8 bC	78.3 aC
EIH (cm)	2013	113.3 aA	111.8 aA	123.3 aA	96.6 aA	95.3 aA	115.8 aA	99.3 aA	87.3 aB
EIH (cm)	2014	108.3 aA	106.5 aA	104.5 bA	83.3 aB	67.5 bC	84.3 bB	56.5 bC	37.3 bD
TT (days)	2013	79.7 aB	79.2 aB	79.0 aB	76.5 aB	81.0 aA	76.5 aB	77.2 bB	84.0 aA
TT (days)	2014	75.2 bB	74.2 bB	80.2 aA	74.0 aB	74.5 bB	78.0 aB	83.2 aA	82.5 aA
BY (g)	2013	241.2 aB	230.0 aC	215.0 aC	183.2 aC	310.0 aA	255.0 aB	203.0 aC	175.0 aC
BY (g)	2014	106.5 bA	81.2 bA	98.7 bA	90.0 bA	91.2 bA	105.0 bA	120.0 bA	91.2 bA

Treatment⁽¹⁾	P30F53HR			SCS 154 Fortuna
Treatment⁽¹⁾	PH (cm)	EIH (cm)	SD (mm)	PH (cm)	EIH (cm)	SD (mm)
T1	165.5 a	109.6 a	21.4 b	162.5 b	110.8 a	20.9 c
T2	144.9 a	91.5 b	20.6 b	165.8 b	109.1 a	19.9 c
T3	143.3 a	103.9 a	20.4 b	183.0 a	115.9 a	20.1 c
T4	134.6 a	87.6 b	21.2 b	155.3 b	89.6 b	20.8 c
T5	130.9 a	87.4 b	22.6 a	132.8 c	81.4 b	21.1 c
T6	143.4 a	86.5 b	20.7 b	154.5 b	100.0 a	20.2 c
T7	118.9 b	73.8 c	22.5 a	120.1 c	77.9 b	23.7 b
T8	86.0 c	52.5 d	24.3 a	88.3 d	62.3 c	26.2 a

P30F53HR
Season	PH (cm)	EIH (cm)	SD (mm)	NL (n^o.)	TT (days)	BY (g)
2013	146.2 a	95.7 a	22.5 a	16.3 b	78.6 a	194.3 a
2014	120.7 b	78.4 b	21.0 b	18.5 a	74.6 b	90.6 b
SCS 159 Fortuna
2013	163.2 a	105.7 a	22.4 a	16.6 b	79.2 a	226.6 a
2014	127.3 b	81.0 b	20.9 b	19.0 a	77.8 a	98.0 b