Fiber Quality of Colored Cotton As a Function of Potassium Fertilization in the Semi-Arid Region

Figures & data

Figure 1. Rainfall, solar radiation, air temperature and relative humidity during the 2019 (a) and 2021 (b) crops mossoró, RN, Brazil.

Figure 2. Fiber length (UHM) of colored cotton cultivars under potassium doses, in two cultivation 2019 (a) and 2021 (b) crops.

Figure 3. Fiber uniformity (UNF) of colored cotton cultivars under potassium doses, in two cultivation 2019 (a) and 2021 (b) crops.

Figure 4. Short fiber index (SFI) of colored cotton cultivars under potassium doses, in two cultivation 2019 (a) and 2021 (b) crops.

Figure 5. Micronaire index (MIC) of colored cotton cultivars under potassium doses, in two cultivation 2019 (a) and 2021 (b) crops.

Table 1. Average values for strength at rupture (STR), elongation at rupture (ELG), and maturity (MAT), in colored cotton cultivars, in two cultivation seasons.

STR (gf/tex)
Seasons	Cultivar
	BRS Rubi	BRS Safira	BRS Verde	BRS Topázio
2019	23.74aC	27.13bB	22.90aC	29.63 bA
2021	24.15aB	30.25aA	23.53aB	30.89aA
ELG (%)
Seasons	Cultivars
	BRS Rubi	BRS Safira	BRS Verde	BRS Topázio
2019	7.13 bA	7.05aA	6.22aB	5.90aB
2021	7.60aA	7.31aA	5.76aB	5.56aB
MAT
Seasons	Cultivars
	BRS Rubi	BRS Safira	BRS Verde	BRS Topázio
2019	0.844aC	0.861bB	0.819bD	0.869 bA
2021	0.845aC	0.866aB	0.824aD	0.871aA

^aMeans followed by different lowercase letters in the column and by different capital letters in the row differ from each other, at a 5% probability level, by the Tukey test.

Figure 6. Count strength product (CSP) index of the fiber of colored cotton under potassium doses, in two cultivation 2019 and 2021 crops.

Table 2. Pearson correlation of fiber quality variables for length (UHM), uniformity (UNF), short fiber index (SFI), strength at rupture (STR), elongation at rupture (ELG), micronaire index (MIC), maturity (MAT) and count strength product (CSP) index of naturally cotton colored in two cultivation seasons.

2019
	UHM	UNF	SFI	MIC	STR	ELG	MAT	CSP
UHM	1.00
UNF	0,92**	1.00
SFI	−0,93**	−0,88**	1.00
MIC	−0,20^ns	0,02^ns	0,02^ns	1.00
STR	0,37^ns	0,48*	−0,52*	0,76**	1.00
ELG	−0,91**	−0,82**	0,93**	0,21^ns	−0,32^ns	1.00
MAT	0,02^ns	0,22^ns	−0,20^ns	0,95**	0,89**	−0,004^ns	1.00
CSP	0,98**	0,92**	−0,96**	−0,12^ns	0,47*	−0,92**	0,12^ns	1.00
2021
	UHM	UNF	SFI	MIC	STR	ELG	MAT	CSP
UHM	1.00
UNF	0.96**	1.00
SFI	−0.94**	−0.91**	1.00
MIC	−0.26^ns	−0.16^ns	0.02^ns	1.00
STR	0.26^ns	0.35^ns	−0.45*	0.80**	1.00
ELG	−0.93**	−0.84**	0.88**	0.40^ns	−0.11^ns	1.00
MAT	0.09^ns	0.15^ns	−0.31^ns	0.93**	0.90**	0.06^ns	1.00
CSP	0.98**	0.98**	−0.94**	−0.17^ns	0.38^ns	−0.89**	0.16^ns	1.00

ns; *; ** - Not significant, significant at p ≤ .05 and 0.01, respectively. 0 a 0.19 – Very weak; 0.20 to 0.39 – Weak; 0.40 to 0.69 – Moderate; 0.70 to 0.89 – Strong; 0.90 to 1.00 – Very strong.