Trinexapac-ethyl is a popular plant growth regulator used in various crops, mostly due to its unique anti-lodging properties. Recently it has been found that this substance is also active in stress protection, which may increase its importance in the coming years. This paper presents a new approach to its application. Trinexapac-ethyl belongs to the cyclohexanedione class of herbicide chemistry, thus it is structurally similar to common graminicides frequently used with adjuvants. This study examines the effects of the application of trinexapac-ethyl with adjuvants. Field trials were conducted in the Institute of Plant Protection in Poznań (Poland), in 2014 and 2015. Trinexapac-ethyl was applied at recommended (0.4l・ha-1) and reduced doses (0.2l・ha-1) with organosilicone surfactant, ammonium sulphate and citric acid on spring barley. Stem shortening, yield components and grain quality were examined. The results of the study confirmed the possibility of dose reduction of trinexapac-ethyl by way of combined application with citric acid that reduced the pH of spray liquid or with ammonium sulphate without affecting its effectiveness. The greatest stem height reduction was observed after the application of a full dose of trinaxapac ethyl and its reduced dose in the mixture with citric acid or ammonium sulphate. Depending on the year of study, the effectiveness of the substances on stem reduction ranged from 5.6 to 16.5%. The tested mixtures did not have any significant impact on the number of grains per ear or the yield of spring barley. Trinexapac-ethyl and its mixtures with adjuvants did not influence the crude protein and starch in spring barley grains.
Adams R., Kerber E., Pfister K., Weiler E.W. 1992. Studies on the action of the new growth retardant CGA 163’935 (Cimectacarb). Progress in Plant Growth Regulation. Current Plant Science and Biotechnology in Agriculture 13: 818-827.
Ahmed F., Baloch D.M., Sadiq S.A., Ahmed S.S., Hanan A., Taran S.A., Ahmed N., Hassan M.J. 2014. Plant growth regulators induced drought tolerance in sunfl ower (Helianthus annuus L.) hybrids. Journal of Animal and Plant Sciences 24 (3): 886-890.
Fagerness M.J., Penner D. 1998. Spray application parameters that infl uence the growth inhibiting eff ects of trinexapac- -ethyl. Crop Science 38 (4): 1028-1035.
Giltrap N.J., Garstang J.R. 1991. Eff ect of PGRS and nitrogen rate on grain yield and quality of Marinka winter barley. p. 987-994. In: Proceedings oft the Brighton Crop Protection Conference: Weeds 7C-10. Brighton, UK, 18-21 November, 1991.
Green J.M., Cahill W.R. 2003. Enhancing the biological activity of nicosulfuron with pH adjusters. Weed Technology 17 (2): 338-345.
Grijalva-Contreras R.L., Macias-Duarte R., Martinez-Diaz G., Robles-Contreras F., Nunez-Ramirez F. 2012. Eff ects of trinexapac-ethyl on diff erent wheat varieties under desert conditions of Mexico. Agricultural Sciences 3 (5): 658-662.
Heckman N.L., Horst G.L., Gaussoin R.E., Young L.J. 2001. Heat tolerance of Kentucky bluegrass as aff ected by trinexapac- -ethyl. HortScience 36 (2): 365-367.
Henderson E.J.C., Maurer W., Cornes D.W., Ryan P.J. 1991. Benefi cial eff ects of the plant growth regulator CGA 163‘935 in oilseed rape under UK conditions. p. 203-209. In: Proceedings oft the Brighton Crop Protection Conference: Weeds 3C-2. Brighton, UK, 18-21 November, 1991.
Idziak R., Woźnica Z., Sobiech Ł. 2013. Eff ect of oil and mineral adjuvants on effi cacy and physiochemical properties of foramsulfuron and iodosulfuron spray mixture. Pakistan Journal of Agriculture Sciences 50 (4): 671-676.
Kelbert A.J., Spaner D., Briggs K.G., King J.R. 2004. Th e association of culm anatomy with lodging susceptibility in modern spring wheat genotypes. Euphytica 136 (2): 211-221.
McCann S.E., Huang B. 2007. Eff ects of trinexapac-ethyl foliar application on creeping bentgrass responses to combined drought and heat stress. Crop Science 47 (5): 2121-2128.
Matysiak K. 2006. Infl uence of trinexapac-ethyl on growth and development of winter wheat. Journal of Plant Protection Research 46 (2): 133-143.
Miziniak W. 2013. Infl uence of spray liquid acidity on eff ectiveness of some growth regulators in spring barley crops. Progress in Plant Protection 53 (4): 817-821.
Miziniak W., Piszczek J. 2014. Biological activity of growth regulators used with adjuvants in winter wheat crops. Progress in Plant Protection 54 (4): 476-480.
Miziniak W., Matysiak K. 2016. Two tank-mix adjuvants eff ect on yield and quality attributes of wheat treated with growth retardants. Ciencia Rural 46 (9): 1559-1565.
Nalewaja J.D., Matysiak R. 1993. Infl uence of diammonium sulfate and other salts on glyphosate phytotoxicity. Pesticide Science 38 (2-3): 77-84.
Pricinotto L.F., Zucareli C., de Batista I.C., de Oliveira M.A., Ferreira A.S., Spolaor L.T. 2015. Trinexapac-ethyl in the vegetative and reproductive performance of corn. African Journal of Agricultural Research 10 (14): 1735-1742.
Rademacher W. 2000. Growth retardants: Eff ects on gibberellin biosynthesis and other metabolic pathways. Annual Review of Plant Physiology and Plant Molecular Biology 51: 501-531.
Rajala A., Peltonen-Sainio P. 2000. Manipulating yield potential in cereals using plant growth regulators. p. 27-70. In: „Growth Regulators in Crop Production“ (A.S. Basra, ed.). Binhamton, New York, USA, Food Products Press, XX pp.
Rajala A., Peltonen-Sainio P. 2001. Plant growth regulator effects on spring cereal root and shoot growth. Agronomy Journal 93 (4): 936-943.
Rajala A., Peltonen-Sainio P. 2002. Timing applications of growth regulators to alter spring cereal development at high latitudes. Agricultural and Food Science in Finnland 11: 233-244.
Roskamp J.M., Chahal G.S., Johnson W.G. 2013. Th e eff ect of cations and ammonium sulphate on the effi cacy of dicamba and 2,4-D. Weed Technology 27 (1): 72-77.
Stachecki S., Praczyk T., Adamczewski K. 2004. Adjuvant eff ects on plant growth regulators in winter wheat. Journal of Plant Protection Research 44 (4): 365-371.
Supronienė S., Auškalnienė O., Dabkevičius Z., Mankevičienė A. 2006. Th e eff ects of growth regulators on spring barley (Hordeum vulgare L.) morphological indicators and grain contamination with fungi and mycotoxins. Agronomy Research 4 (Special issue): 397-401.
Tatnell J.A. 1995. Th e relationship between height reduction, lodging control and yield in winter barley following use of trinexapac-ethyl. p. 635-640. In: Proceedings of the Brighton Crop Protection Conference: Weeds. Brighton, UK, 18-21 November, 1995.
Tripathi S.C., Sayre K.D., Kaul J.N., Narang R.S. 2004. Lodging behavior and yield potential of spring wheat (Triticum aestivum L.) eff ects of ethephon and genotypes. Field Crops Research 87 (2-3): 207-220.
Woolley E.W. 1991. Recent experience of timing of growth regulators on winter wheat. p. 981-986. In: Proceedings of the Brighton Crop Protection Conference: Weeds 7C-10. Brighton, UK, 18-21 November, 1991.
Woźnica Z., Nalewaja J.D., Messershmith G., Milkowski P. 2003. Quinclorac effi cacy as eff ected by adjuvants and spray carrier water. Weed Technology 17 (3): 582-588.