Effects of several Plant Growth Regulators on the Yield and Fiber Quality of Cotton (Gossypium hirsutum L.)

Notulae Botanicae Horti Agrobotanici Cluj-Napoca 01/2010;
Source: DOAJ

ABSTRACT Plant growth regulators (PGR) are used in cotton (Gossypium hirsutum L.) production to balance vegetative and reproductive growth, as well as to increase seed cotton yield and lint quality. Field experiments were conducted with some PGRs to determine their effects on yield and yield components of cotton cultivar Stoneville 453. The study was conducted in 2004 and 2005 at the Agricultural Research and Application Centre of Harran University located in Şanlıurfa, Turkey. During the study, seven commercial PGRs (MC, NAP, BIGIB, KH, MCROP and BIGIBER) were sprayed at recommended doses and appropriate application periods. Experiments were arranged as randomized complete block design with three replications. Experimental plots consisted of six rows, each having 12 m length, row spacing was 0.70 and intra-row spacing was 0.20 m. The results showed that PGRs (except PC) had statistically significant positive effects on the seed cotton yield, plant height, number of open boll, number of sympodia, boll weight, lint percentage and seed index and that they decreased the earliness index. However, fibre length, fibre fineness, fibre strength and fibre uniformity were not affected by the applications. Higher yields were obtained in MCROP, BIGIB and BIGIBER treated plots. Therefore, PGRs might be considered a component of cotton growth management, which is effective on providing higher seed cotton yields.

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    ABSTRACT: The commercial importance of linseed (Linum usitatissimum L.) has attracted breeders to increase its seed yield using various breeding approaches. Plant growth regulators (PGRs) have a significant role in enhancing yield and its related traits in linseed. In the present study, two plant growth hormones, auxin and gibberellic acid, were applied individually, as well as in combinations, in order to study their effect on yield and its components in "Neelam", which is a high yielding variety of linseed. A comparative study was done under pot and field condition. A combined dose of auxin (1.0 mg L-1) and gibberellin (200 mg L-1) is recommended for the enhancement of seed yield, whereas a 0.5 mg L-1 dose of auxin is recommended for the enhancement of vegetative growth. It was concluded that the plant growth regulators can be successfully employed to enhance the yield in this economically important oil seed crop.
    07/2013; 13(2):136-143. DOI:10.1590/S1984-70332013000200006

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