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Verónica De Luca, Diego Gómez de Barreda, Antonio Lidón, and Cristina Lull

. Another review of the effect of biostimulants based on humic and fulvic acids on 30 horticulture crops concluded that the use of such biostimulants in horticultural crops is a key sustainable technology that can make cropping systems more productive

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Karla Gabrielle Dutra Pinto, Sônia Maria Figueiredo Albertino, Bruna Nogueira Leite, Daniel Oscar Pereira Soares, Francisco Martins de Castro, Laís Alves da Gama, Débora Clivati, and André Luiz Atroch

exogenous auxin for the rooting of stem cuttings ( Ramos et al., 2003 ). The rooting method used for guarana seedling production suggests 70% shading, intermittent overhead mist, and the application of 2000 ppm indole-3-butyric acid (IBA); however, this

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Steven J. McArtney and John D. Obermiller

-benzyladenine ( Botton et al., 2011 ), and naphthaleneacetic acid ( Zhu et al., 2011 ), provide evidence in support of the hypothesis that a carbohydrate deficit in the fruit is one of the earliest responses to chemical or environmental stimuli that trigger

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Rebecca M. Koepke-Hill, Gregory R. Armel, William E. Klingeman, Mark A. Halcomb, Jose J. Vargas, and Phillip C. Flanagan

perennial plants like mugwort. Herbicides that inhibit amino acid formation in plants and those which mimic indole-3-acetic acid are usually systemic in nature, and therefore, multiple herbicides in these classes of chemistry often have some activity on

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Stephen E. McCann and Bingru Huang

). Abscisic acid (ABA) is a plant hormone and growth regulator known to be involved in plant adaptation to drought stress. Exogenous application of ABA has been reported to improve drought tolerance in various plant species such as maize ( Zea mays L

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Jong-Goo Kang, Rhuanito Soranz Ferrarezi, Sue K. Dove, Geoffrey M. Weaver, and Marc W. van Iersel

Abscisic acid is a hormone that has an important role in regulating stomatal closure. In response to drought stress, ABA can be synthesized in roots and translocated to leaves by way of the transpirational stream ( Davies et al., 2005 ; Malladi and

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Yongfeng Yang, Zhixiao Yang, Shizhou Yu, and Hongli Chen

et al., 2011 ). Cluster roots are characterized to release organic acid anions at a high level, and citrate is demonstrated to be the predominant acid released by cluster roots of tobacco under a K-deficient condition ( Wu et al., 2013 ). Collectively

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Charles L. Webber and James W. Shrefler

Producers and researchers are interested in pelargonic acid (nonanoic acid) as a broad-spectrum postemergence or burn-down herbicide. Pelargonic acid is a fatty acid naturally occurring in many plants and animals, and present in many foods we consume. The objective of this research was to determine the effect of pelargonic acid concentration, adjuvants, and application timing on weed control efficacy as a burn-down herbicide. Field research was conducted at Lane, Okla. (southeast Oklahoma), during the 2005 growing season. One month prior to spraying the weed control treatments, the land was cultivated to kill the existing weeds and provide a uniform seed bed for new weed growth. The factorial weed control treatments included three application concentrations of Scythe (57.0% pelargonic acid) applied at 3%, 6.5%, and 10%; three adjuvants (none, orange oil, and non-ionic surfactant); and two application dates. All herbicide treatments were applied with an application volume of 935 L/ha to seedling weeds. The experiment had a high weed density with multiple species of grass and broadleaf weeds. Weed control across species increased as the herbicide concentrations increased from 0% to 10%. At all concentrations applied, pelargonic acid produced greater weed control for a longer time period for the broadleaf weeds than the grass weeds. Visual damage to the weeds was often apparent within a few hours after application. There was a significant increase in weed control when applied to the younger weeds. In this research, pelargonic acid was effective in controlling both broadleaf and grass weeds as a burn-down herbicide, although crabgrass was tougher to control.

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Manuel G. Astacio and Marc W. van Iersel

mL, a reduction of 87% compared with the control plants ( Fig. 1 ). Fig. 1. Cumulative transpiration of tomato plants over a 28-h period after treatment with abscisic acid (ABA) drenches. Significant effects of ABA on cumulative transpiration were

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Simone da Costa Mello, Jéssika Angelotti-Mendonça, Lucas Baiochi Riboldi, Luigi Tancredi Campo Dall’Orto, and Eduardo Suguino

1. Effect of indole-3-butyric acid (IBA) concentration (0, 30, 60, and 90 mg·L −1 ) and cuttings type (softwood and semihardwood) on cutting survival (CS), rooting, number of roots (NOR), dry weight of roots (DWR), and root length (RL) of ‘Yabukita