Row spacing and seed physiological quality of <i>Crotalaria</i> species

Silva, Bruna Neves Pereira da; Masetto, Tathiana Elisa; Garcia, Rodrigo Arroyo; Toledo, Mariana Zampar

doi:10.1590/1983-40632022v5272674

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Research Article • Pesq. Agropec. Trop., Goiânia 52 • 2022 • https://doi.org/10.1590/1983-40632022v5272674 copy

Row spacing and seed physiological quality of Crotalaria species

Espaçamento entre linhas e qualidade fisiológica de sementes de espécies de Croatalaria

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

Crotalaria crops have important uses, such as in green manuring, nematode control, biological nitrogen fixation and sugarcane reform in Savanna areas. Due to its strategic importance, knowledge about crotalaria seed production technology is a relevant factor to ensure the availability of high physiological quality seeds. This study aimed to assess the effect of two row spacings (20 and 40 cm) on the germination and vigor of Crotalaria ochroleuca and Crotalaria spectabilis seeds produced in two crop seasons (2018 and 2019). The experimental design was randomized blocks, with four replications, in a 2 x 2 factorial scheme (spacing x crop season), for each species. The climatic conditions during seed production significantly infuenced the physiological quality of the crotalaria seeds. The 2018 harvest, with more abundant rainfall and milder temperatures during flowering, provided more vigorous seeds for both species. The 20 cm spacing was more efficient to produce C. ochroleuca seeds with high physiological performance. Notwithstanding, C. spectabilis seeds showed a higher physiological quality when produced under 40 cm spacing than when produced under denser cultivation.

KEYWORDS
Crotalaria ochroleuca ; Crotalaria spectabilis ; seed vigor

Crop season	Spacing (cm)
Crop season	20	40
2018	76 Aa¹ 1 Means followed by the same uppercase letter in the column and lowercase letter in the row do not difer from each other by the Tukey test at 5 % of probability.	79 Aa
2019	67 Ba	69 Ba

Crop season	AA	CT	SL	RL	SDM	RDM	SE	EC
2018	77 a¹ 1 Means followed by different letters in the column difer from each other by the Tukey test at 5 % of probability.	79 a	6.52 a	5.86 a	0.07 a	0.03 a	95 a	30.60 b
2019	52 b	67 b	2.82 b	3.13 b	0.03 b	0.01 b	76 b	35.35 a

Spacing (cm)	SE	RL	SDM	CT
20	89 a¹ 1 Means followed by different letters in the column difer from each other by the Tukey test at 5 % of probability.	4.75 a	0.05 a	71 b
40	82 b	4.24 b	0.04 b	75 a

Crop season	G	CT	SL	EC
2018	74 a¹ 1 Means followed by different letters in the column difer from each other by the Tukey test at 5 % of probability.	78 a	6.68 a	19.71 b
2019	71 b	50 b	3.71 b	20.26 a

	Spacing (cm)	RDM
	20	0.02 b
	40	0.04 a

Crop season	AA		RL		SDM		SE
Crop season	20	40	20	40	20	40	20	40
2018	64 Ab¹ 1 Means followed by different uppercase letters in the column and lowercase letters in the row do not difer from each other by the Tukey test at 5 % of probability.	73 Aa	2.10 Aa	2.35 Aa	0.06 Aa	0.07 Aa	94 Aa	82 Ab
2019	40 Ba	40 Ba	0.55 Bb	2.57 Aa	0.02 Bb	0.06 Aa	57 Ba	54 Ba

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Means followed by the same uppercase letter in the column and lowercase letter in the row do not difer from each other by the Tukey test at 5 % of probability.