Santos, Rayssa Fernanda dos; Placido, Henrique Fabrício; Bosche, Leonardo Lemes; Zeni Neto, Hugo; Henning, Fernando Augusto; Braccini, Alessandro Lucca

Resumo:

O objetivo deste estudo foi avaliar a eficiência do teste de envelhecimento acelerado para determinar o potencial fisiológico de sementes de soja com diferentes tratamentos químicos; verificar a influência do tratamento de sementes após o armazenamento e analisar a concordância entre os métodos de envelhecimento acelerado com os resultados reais de armazenamento das sementes. O estudo foi dividido em dois experimentos, ambos com delineamento inteiramente casualizado, com quatro repetições. No primeiro experimento os tratamentos foram dispostos em esquema fatorial 3 x 2 x 3: três tratamento de sementes (imidacloprid + thiodicarb; fipronil + thiophanate methyl + pyraclostrobin; ausência de tratamento), dois níveis de vigor (alto; baixo) e três métodos de envelhecimento acelerado (tradicional; solução saturada de NaCl; sem envelhecimento) avaliando-se a germinação. No segundo experimento, os tratamentos foram dispostos em esquema fatorial 3 x 2 x 2: três tratamentos de sementes (imidacloprid + thiodicarb; fipronil + thiophanate methyl + pyraclostrobin; ausência de tratamento), dois níveis de vigor (alto; baixo), dois tempos de armazenamento (0 e 135 dias), avaliando-se a germinação e emergência de plântulas. Os métodos de envelhecimento acelerado foram eficientes para determinar o potencial fisiológico das sementes, em que, o NaCl apresentou melhores resultados. O potencial fisiológico das sementes de soja reduziu ao longo do armazenamento e a aplicação de produtos químicos no tratamento de sementes prejudicou as porcentagens de germinação e emergência, independente do ingrediente ativo utilizado. O método de envelhecimento acelerado com NaCl apresenta maior concordância com os resultados reais de armazenamento.

Termos para indexação:
Glycine max; tratamento de sementes; germinação; vigor

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

Active ingredients	Type¹ 1 Type: I: insecticide; F: fungicide. 2 Commercial product dose: mL.100 kg-1 of seeds.	Commercial Dose² 1 Type: I: insecticide; F: fungicide. 2 Commercial product dose: mL.100 kg-1 of seeds.
imidacloprid + thiodicarb	I + I	300
fipronil + thiophanate methyl + pyraclostrobin	I + F+ F	200
Control	-	-

SV	Mean Square
Active ingredients	325.06^* * Significant at 5% probability level by the F test; ns: not significant; SV: Source of variation. C.V.: Coefficient of variation.
Vigor	3556.06^* * Significant at 5% probability level by the F test; ns: not significant; SV: Source of variation. C.V.: Coefficient of variation.
Accelerated aging	6766.72^* * Significant at 5% probability level by the F test; ns: not significant; SV: Source of variation. C.V.: Coefficient of variation.
Active ingredients *Vigor	2.06^ns * Significant at 5% probability level by the F test; ns: not significant; SV: Source of variation. C.V.: Coefficient of variation.
Active ingredients * Accelerated aging	83.22^ns * Significant at 5% probability level by the F test; ns: not significant; SV: Source of variation. C.V.: Coefficient of variation.
Vigor* Accelerated aging	393.72^* * Significant at 5% probability level by the F test; ns: not significant; SV: Source of variation. C.V.: Coefficient of variation.
Active ingredientsVigor Accelerated aging	90.72^ns * Significant at 5% probability level by the F test; ns: not significant; SV: Source of variation. C.V.: Coefficient of variation.
Residue	39.8
C.V.(%)	3.69

SV	Mean Square
SV	Germination	Emergence
Active ingredients	300.06^* * Significant at 5% probability level by the F test; ns: not significant; SV: Source of variation. C.V.: Coefficient of variation.	727.00^* * Significant at 5% probability level by the F test; ns: not significant; SV: Source of variation. C.V.: Coefficient of variation.
Storage	3056.02^* * Significant at 5% probability level by the F test; ns: not significant; SV: Source of variation. C.V.: Coefficient of variation.	290.08^* * Significant at 5% probability level by the F test; ns: not significant; SV: Source of variation. C.V.: Coefficient of variation.
Vigor	295.02^* * Significant at 5% probability level by the F test; ns: not significant; SV: Source of variation. C.V.: Coefficient of variation.	1408.33^* * Significant at 5% probability level by the F test; ns: not significant; SV: Source of variation. C.V.: Coefficient of variation.
Active ingredients * Storage	134.4^ns * Significant at 5% probability level by the F test; ns: not significant; SV: Source of variation. C.V.: Coefficient of variation.	39.58^ns * Significant at 5% probability level by the F test; ns: not significant; SV: Source of variation. C.V.: Coefficient of variation.
Active ingredients *Vigor	187.15^* * Significant at 5% probability level by the F test; ns: not significant; SV: Source of variation. C.V.: Coefficient of variation.	80.33^* * Significant at 5% probability level by the F test; ns: not significant; SV: Source of variation. C.V.: Coefficient of variation.
Storage *Vigor	6.02^ns * Significant at 5% probability level by the F test; ns: not significant; SV: Source of variation. C.V.: Coefficient of variation.	36.75^ns * Significant at 5% probability level by the F test; ns: not significant; SV: Source of variation. C.V.: Coefficient of variation.
Active ingredients * Storage *Vigor	109.15^ns * Significant at 5% probability level by the F test; ns: not significant; SV: Source of variation. C.V.: Coefficient of variation.	47.25^ns * Significant at 5% probability level by the F test; ns: not significant; SV: Source of variation. C.V.: Coefficient of variation.
Residue	48.19	22.26
C.V. (%)	3.97	2.07

Accelerated aging	Germination (%)
Accelerated aging	Seed Vigor Level
Method	High	Low
Traditional	57 Ba	36 Cb
Saturated NaCl solution	63 Ba	48 Bb
No aging	82 Aa	76 Ab

Active ingredients	Germination (%)
imidacloprid + thiodicarb	58 B
fipronil + thiophanate methyl + pyraclostrobin	59 B
Control	65 A

Brasil

Brasil

Accelerated aging methodologies for evaluating physiological potential of treated soybean seeds

Resumo:

Active ingredients	Emergence (%)
	Seed Vigor Level
	High	Low
imidacloprid + thiodicarb	84 Ba	75 Bb
fipronil + thiophanate methyl + pyraclostrobin	89 Ba	73 Bb
control	96 Aa	88 Ab