Drying kinetics and physiological quality of ‘Cabacinha’ pepper seeds during storage

Silva, Hellismar W. da; Vale Junior, Luís S. R.; Silva, Camila F.; Souza, Rannie do C.; Soares, Renato S.

doi:10.1590/1807-1929/agriambi.v22n4p292-297

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ARTICLES • Rev. bras. eng. agríc. ambient. 22 (4) • Apr 2018 • https://doi.org/10.1590/1807-1929/agriambi.v22n4p292-297 copy

Drying kinetics and physiological quality of ‘Cabacinha’ pepper seeds during storage

Cinética de secagem e qualidade fisiológica de sementes de pimenta Cabacinha durante o armazenamento

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

Drying air temperature has direct influence on seed quality, especially for vegetable species harvested with high moisture content. This study aimed to determine and model the drying curves of ‘Cabacinha’ pepper seeds (Capsicum chinense L.) at different temperatures, and to evaluate their physiological quality after drying and during storage. The experimental design was completely randomized in a 3 x 3 factorial scheme, with three drying temperatures (35, 38 and 42 °C) and three storage periods (0, 4 and 8 months), with four replicates. Seed quality was evaluated by germination test, first germination count, accelerated aging, electrical conductivity, seedling emergence, and speed of emergence. The Two Terms is the model that best represents the drying curves of ‘Cabacinha’ pepper seeds at temperatures of 35, 38 and 42 °C. Higher germination and vigor values are obtained in seeds dried at 35 and 38 °C. Drying at 42 °C and storage reduce the physiological quality of the seeds.

Key words:
Capsicum chinense L.; drying temperature; germination; vigor

Model designation	Model	n°
Approximation of Diffusion	$R M = a e x p (- k t) + (1 - a) e x p (- k b t)$	(3)
Two terms	$R M = a e x p (- k t) + b e x p (- c t)$	(4)
Exp. Two Terms	$R M = a e x p (- k t) + (1 - a) e x p (- k a t)$	(5)
Henderson-Pabis	$R M = a e x p (- k t)$	(6)
Midilli	$R M = a e x p (- k t^{b}) + c t$	(7)
Modified Midilli	$R M = e x p (- k t^{n}) + a t$	(8)
Page	$R M = e x p (- k t^{n})$	(9)
Modified Page	$R M = e x p (- k t^{n})$	(10)
Thompson	$R M = e x p (- {(k t)}^{n})$	(11)
Verna	$R M = a e x p (- k t) + (1 - a) e x p (- b t)$	(12)

Models	R²	P	SE	RD	R²	P	SE	RD	R²	P	SE	RD
Models	35 ºC				38 ºC				42 ºC
Approximation of Diffusion	0.997	0.699	0.034	RN	0.997	1.020	0.032	RN	0.999	0.276	0.009	RN
Two Terms	0.997	1.036	0.035	RN	0.997	1.022	0.027	RN	0.999	0.277	0.007	RN
Exp. Two Terms	0.825	8.885	0.383	BS	0.517	12.343	0.452	BS	0.830	9.049	0.300	BS
Henderson-Pabis	0.926	3.775	0.257	BS	0.784	6.548	0.328	BS	0.851	7.457	0.282	BS
Midilli	0.996	1.274	0.042	RN	0.996	1.252	0.035	RN	0.996	1.358	0.034	RN
Modified Midilli	0.996	1.270	0.049	RN	0.996	1.249	0.040	RN	0.996	1.351	0.040	RN
Page	0.994	1.956	0.076	RN	0.994	1.400	0.057	RN	0.980	2.710	0.106	BS
Modified Page	0.994	1.956	0.076	RN	0.994	1.400	0.057	RN	0.980	2.710	0.106	BS
Thompson	0.989	2.252	0.101	RN	0.929	5.298	0.196	BS	0.972	3.863	0.126	BS
Verna	0.926	3.775	0.209	BS	0.784	6.549	0.268	BS	0.851	7.458	0.231	BS

	FGC	G	SE	AA	EC (μcm^-1 g^-1)
	(%)				EC (μcm^-1 g^-1)
DT (°C)
35	52 a	74 a	89 a	62 a	91.22 a
38	58 a	78 a	88 a	69 a	108.22 a
42	40 b	65 b	81 b	57 a	91.48 a
ST (months)
0	54 b	61 b	85 b	76 a	79.75 b
4	69 a	76 a	94 a	69 b	101.35 a
8	26 c	80 a	79 c	43 c	109.82 a

Drying temperature (°C)	Storage time (months)
Drying temperature (°C)	0	4	8
35	1.563 a A	1.558 a A	1.218 a B
38	1.489 a B	1.684 a A	1.105 a C
42	1.202 b B	1.552 a A	1.029 a B

Unidade Acadêmica de Engenharia Agrícola Unidade Acadêmica de Engenharia Agrícola, UFCG, Av. Aprígio Veloso 882, Bodocongó, Bloco CM, 1º andar, CEP 58429-140, Campina Grande, PB, Brasil, Tel. +55 83 2101 1056 - Campina Grande - PB - Brazil
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[1] waksonhellismar@gmail.com (Corresponding author)