Table 3 Cotton fiber qualities under different treatments after two years’ fertilization (in 2019).

From: Effects of controlled-release urea combined with fulvic acid on soil inorganic nitrogen, leaf senescence and yield of cotton

Treatments

Fiber length (mm)

Fiber uniformity (%)

Micronaire

Fiber elongation (%)

Fiber strength (cN tex-1)

Nitrogen fertilizer type

Controlled-release urea (CRU)

27.3 a

83.7 a

5.5 a

6.8 a

27.8 a

Urea

27.1 b

83.3 b

5.4 b

6.8 a

26.9 b

Fulvic acid (FA) rate (kg ha-1)

90

27.0 b

83.3 b

5.4 b

6.8 a

26.7 c

180

27.4 a

83.8 a

5.5 a

6.8 a

28.0 a

270

27.2 ab

83.4 b

5.4 b

6.8 a

27.4 b

Nitrogen fertilizer type × FA rate interaction

Control

26.3 c

82.9 d

5.4 b

6.8 a

24.6 c

CRU × FA90

27.0 b

83.4 bc

5.5 ab

6.8 a

26.9 b

CRU × FA180

27.5 a

84.2 a

5.6 a

6.8 a

28.7 a

CRU × FA270

27.4 a

83.6 b

5.5 ab

6.8 a

27.8 ab

Urea × FA90

27.0 b

83.2 c

5.4 b

6.8 a

26.5 b

Urea × FA180

27.3 a

83.4 bc

5.5 ab

6.8 a

27.3 ab

Urea × FA270

27.0 b

83.2 c

5.4 b

6.8 a

27.0 b

Source of variance

Nitrogen fertilizer type

0.0259

0.0002

0.0133

0.6075

0.0001

FA rate

0.0068

0.0005

0.0357

0.46

0.0002

Nitrogen fertilizer type × FA rate

0.3774

0.0114

0.683

0.7588

0.0485

  1. Means followed by different lowercase letters in the same column were significantly different based on analyses with ANOVAs followed by Duncan tests (P < 0.05).
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