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Naturally colored fiber cotton has fibers that present natural colors without the need for dyeing processes or dye application. Low nitrogen availability during production can affect fiber quality. Thus, this study aimed to evaluate the fiber quality of naturally colored cotton cultivars as a function of nitrogen fertilization. The research was conducted in an experimental field at the Federal Rural University of Semiarid, Northeast Brazil. The experiment was arranged in a randomized block design, with four replications, in a split-plot scheme. Five nitrogen rates were distributed in the experimental plots, and four naturally colored fiber cotton cultivars were distributed the subplots. The following parameters were evaluated: fiber percentage, fiber length, length uniformity, short-fiber index, strength fiber, fiber elongation, micronaire, fiber maturity, and count strength product. BRS Topázio excelled in most fiber quality characteristics. The 100 kg ha−1 of N and 150 kg ha−1 increase the fiber quality of the cultivars BRS Safira, BRS Topázio, and BRS Rubi. The dose of 200 kg ha−1 of N improved the fiber quality of the BRS Verde cultivar. Nitrogen fertilization positively influenced the fiber quality of naturally colored cotton. [ABSTRACT FROM AUTHOR]

Naturally colored fiber cotton has fibers that present natural colors without the need for dyeing processes or dye application. Low nitrogen availability during production can affect fiber quality. Thus, this study aimed to evaluate the fiber quality of naturally colored cotton cultivars as a function of nitrogen fertilization. The research was conducted in an experimental field at the Federal Rural University of Semiarid, Northeast Brazil. The experiment was arranged in a randomized block design, with four replications, in a split-plot scheme. Five nitrogen rates were distributed in the experimental plots, and four naturally colored fiber cotton cultivars were distributed the subplots. The following parameters were evaluated: fiber percentage, fiber length, length uniformity, short-fiber index, strength fiber, fiber elongation, micronaire, fiber maturity, and count strength product. BRS Topázio excelled in most fiber quality characteristics. The 100 kg ha−1 of N and 150 kg ha−1 increase the fiber quality of the cultivars BRS Safira, BRS Topázio, and BRS Rubi. The dose of 200 kg ha−1 of N improved the fiber quality of the BRS Verde cultivar. Nitrogen fertilization positively influenced the fiber quality of naturally colored cotton. [ABSTRACT FROM AUTHOR]

Naturally colored fiber cotton is an essential alternative green and organic for the textile industry, as it does not require chemical dyeing. However, the low availability of potassium during production can directly affect the quality of the fiber. Based on this, this study aimed to evaluate the fiber quality in naturally colored cotton cultivars submitted to potassium fertilization in a semi-arid region. The experimental design was in randomized blocks, with four replications, and the treatments were arranged in split plots. In the plot, the following were allocated: five K rates (0, 60, 120, 180, and 240 kg ha−1 of K2O); and in the subplots, the four colored cotton cultivars (BRS Rubi, BRS Safira, BRS Topázio, and BRS Verde). The results showed that K is involved in the length, uniformity, short fiber index, micronaire index, and reliability index of naturally colored cotton fibers. A longer fiber length of 30.45 mm was obtained at a dose of 240 kg ha−1 of K2O for the cultivar BRS Topázio. In addition, a higher uniformity (84.95%) was achieved with the dose of 240 kg ha−1 of K2O for BRS Verde. The dose of 240 kg ha−1 of K2O reduced (8.62% and 11.28%) the short fiber index in the cultivars BRS Rubi and BRS Safira, respectively. [ABSTRACT FROM AUTHOR]