_____________________________________________________________________________________________________ *Corresponding author: E-mail: edudaniel@gmail.com, edudaniel@hotmail.com; Journal of Experimental Agriculture International 26(2): 1-13, 2018; Article no.JEAI.43648 ISSN: 2457-0591 (Past name: American Journal of Experimental Agriculture, Past ISSN: 2231-0606) Growth, Gas Exchange and Mineral Nutrition of Xaraés Grass (Brachiaria brizantha cv. Xaraés) in a Haplic Cambisol with Increasing Copper Doses Eduardo da Silva Daniel 1* , Mari Lucia Campos 1 , David José Miquelluti 1 , Clenilso Sehnen Mota 2 and André Fischer Sbrissia 1 1 Agro Veterinary Sciences Center, Santa Catarina State University, Lages, Brazil. 2 Santa Catarina Federal Institute, Rio do Sul, Brazil. Authors’ contributions This work was carried out in collaboration between all authors. Authors MLC and ESD designed the study and managed the literature searches. Authors MLC, ESD and CSM wrote the protocol. Authors ESD and CSM managed the analysis of the study. Author ESD wrote the manuscript. Author DJM performed the statistical analysis. All authors read and approved the final manuscript. Article Information DOI: 10.9734/JEAI/2018/43648 Editor(s): (1) Dr. Slawomir Borek, Professor, Department of Plant Physiology, Adam Mickiewicz University, Poland. Reviewers: (1) Mateja Germ, University of Ljubljana, Slovenia. (2) Nusret Ozbay, Bingol University, Turkey. (3) Eszter Forró-Rózsa, Széchenyi István University, Hungary. Complete Peer review History: http://www.sciencedomain.org/review-history/26377 Received 13 June 2018 Accepted 26 August 2018 Published 24 September 2018 ABSTRACT Aims: To calculate the lower and upper critical doses of Cu applied to a Haplic Cambisol on growth, gas exchange and mineral nutrition of xaraés grass plants (Brachiaria brizantha cv. Xaraés). Study Design: The experiment was arranged in a completely randomised design with four replications. Locality of Study: Department of Soil Science of the Santa Catarina State University, Lages, Brazil, between February and March 2015. Methodology: Xaraés grass plants were cultivated in a greenhouse in pots with soil containing Cu doses in the following increasing order: 0, 30, 60, 120 and 200 mg kg -1 . Before plant cultivation, the Cu availability in the soil was determined. During plant growth, the net CO 2 assimilation rate, Original Research Article