Fiber quality of upland cotton under different irrigation depths

Cordão Sobrinho, Francisco P.; Guerra, Hugo O. C.; Araújo, Whéllyson P.; Pereira, Jose R.; Zonta, João H.; Bezerra, José R. C.

doi:10.1590/1807-1929/agriambi.v19n11p1057-1063

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Sumário

Manejo de Solo, Água e Planta • Rev. bras. eng. agríc. ambient. 19 (11) • Nov 2015 • https://doi.org/10.1590/1807-1929/agriambi.v19n11p1057-1063 copy

Fiber quality of upland cotton under different irrigation depths

Qualidade da fibra do algodoeiro herbáceo sob diferentes lâminas de irrigação

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

Aiming to evaluate the effect of irrigation depths on fiber quality of upland cotton, an experiment was conducted from July to December 2010 in Barbalha-CE, Brazil. The treatments consisted of a factorial combination of two upland cotton cultivars (BRS Aroeira and BRS Araripe) and five irrigation depths (260.93, 418.93, 514.21, 711.81 and 894.68 mm), arranged in a split-plot design with four replicates. A line-source sprinkler irrigation system was used and irrigation depth in the control treatment was calculated according to the crop evapotranspiration. The analysed fiber quality variables were: fiber percentage, length, uniformity, short-fiber index, resistance, elongation at rupture, micronaire index, maturity, degree of yellowing, reflectance degree and count strength product (CSP) index. The irrigation depths influenced fiber length, short-fiber index, strength, micronaire index, maturity and reflectance degree. The cultivars influenced fiber percentage, length and color (degree of yellowing). The best results of fiber quality were found with irrigation depths of 514.21 and 418.93 mm for the upland cotton cultivars BRS Araripe and BRS Aroeira, respectively.

Key words:
Gossypium hirsutum L. r. latifolium H.; water deficit; fiber intrinsic characteristics

Source of variation	DF	Mean square
Source of variation	DF	%FIB	LNG	UNF	SFI	RES	ELG
Block	3	0.01 ns	0.25 ns	0.15 ns	0.23 ns	0.20 ns	0.03 ns
Cultivars	1	21.97^* ** and *Significant at 0.01 and 0.05 probability level, respectively;	3.21^* ** and *Significant at 0.01 and 0.05 probability level, respectively;	0.60 ns	1.02 ns	0.16 ns	0.11 ns
Residue a	3	0.31	0.21	0.25	0.43	2.68	0.04
Irrigation	4	0.38 ns	2.01^ and *Significant at 0.01 and 0.05 probability level, respectively;	1.57 ns	1.07^* ** and *Significant at 0.01 and 0.05 probability level, respectively;	4.66 ns	0.24 ns
Residue b	12	0.58	0.25	0.58	0.25	1.25	0.10
IRRIG x CULT	4	0.43 ns	0.36 ns	0.62 ns	1.62 ns	5.45^ and *Significant at 0.01 and 0.05 probability level, respectively;	0.30^ and *Significant at 0.01 and 0.05 probability level, respectively;
Residue c	12	0.35	0.29	0.35	0.61	0.57	0.05
CV a (%)		1.29	1.53	0.60	18.54	5.15	4.56
CV b (%)		1.75	1.66	0.90	14.32	3.51	7.24
CV c (%)		1.37	1.80	0.70	22.11	2.37	4.95
		Mea ns
Cultivars		(%)	(mm)	(%)	(%)	(gf tex-1)	(%)
BRS Aroeira		44.25 a	29.90 b	84.78 a	3.39 a	31.79 a	4.52 a
BRS Araripe		42.77 b	30.47 a	85.02 a	3.71 a	31.92 a	4.62 a

Source of variation	DF	Mean square
Source of variation	DF	MIC	MAT	RD	+B	CSP
Block	3	0.03 ns	0.15 ns	2.07 ns	0.05 ns	7626.52 ns
Cultivars	1	0.00 ns	0.04 ns	18.67 ns	0.25^* ** and *Significant at 0.01 and 0.05 probability level, respectively;	39988.86 ns
Residue a	3	0.01	0.15	2.16	0.00	4215.58
Irrigation	4	0.19^ and *Significant at 0.01 and 0.05 probability level, respectively;	2.39^ and *Significant at 0.01 and 0.05 probability level, respectively;	22.16^ and *Significant at 0.01 and 0.05 probability level, respectively;	0.17 ns	36033.84 ns
Residue b	12	0.02	0.35	3.07	0.10	16918.22
IRRIG x CUL	4	0.07^ and *Significant at 0.01 and 0.05 probability level, respectively;	1.15^ and *Significant at 0.01 and 0.05 probability level, respectively;	2.84 ns	0.17 ns	43507.14^ and *Significant at 0.01 and 0.05 probability level, respectively;
Residue c	12	0.01	0.12	2.58	0.10	7107.31
CV a (%)		2.08	0.44	1.85	1.08	2.31
CV b (%)		2.83	0.66	2.21	3.94	4.62
CV c (%)		2.26	0.40	2.02	4.00	2.99
		Mea ns
Cultivars		(μg in^-1)	(%)	-	-	-
BRS Aroeira		4.99a	89.26a	80.18a	8.17b	2783.45a
BRS Araripe		5.01a	89.20a	78.82a	8.33a	2846.69a

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