CRESCIMENTO E TROCAS GASOSAS DO ALGODOEIRO SOB SALINIDADE DA ÁGUA E COMBINAÇÃO NITROGÊNIO-POTÁSSIO

Adaan Sudário Dias; Geovani Soares de  Lima; Hans Raj  Gheyi; Lauriane Almeida dos Anjos  Soares; Pedro Dantas  Fernandes

doi:10.1590/1983-21252020v33n219rc

Authors

Adaan Sudário Dias Academic Unit of Agricultural Engineering, Universidade Federal de Campina Grande, Campina Grande, PB https://orcid.org/0000-0002-2247-1511
Geovani Soares de Lima Academic Unit of Agricultural Sciences, Center of Agrifood Science and Technology, Universidade Federal de Campina Grande, Pombal, PB https://orcid.org/0000-0001-9960-1858
Hans Raj Gheyi Nucleus of Soil and Water Engineering, Universidade Federal do Recôncavo da Bahia, Cruz das Almas, BA https://orcid.org/0000-0002-1066-0315
Lauriane Almeida dos Anjos Soares Academic Unit of Agricultural Sciences, Center of Agrifood Science and Technology, Universidade Federal de Campina Grande, Pombal, PB https://orcid.org/0000-0002-7689-9628
Pedro Dantas Fernandes Academic Unit of Agricultural Engineering, Universidade Federal de Campina Grande, Campina Grande, PB https://orcid.org/0000-0001-5070-1030

DOI:

https://doi.org/10.1590/1983-21252020v33n219rc

Keywords:

Gossypium hirsutum L.. Salinized waters. Photosynthesis. Phytomass.

Abstract

The objective of this study was to evaluate the growth and gas exchanges of white-fiber cotton cv. BRS 368 RF irrigated using waters with increasing levels of salinity under nitrogen-potassium combination in a greenhouse in the municipality of Campina Grande-PB, Brazil. The treatments were distributed in randomized blocks, corresponding to five levels of electrical conductivity of water - ECw (0.7; 2.2; 3.7; 5.2 and 6.7 dS m^-1) and four combinations of fertilization nitrogen-potassium - N/K₂O (70/50, 100/75, 130/100, 160/125% of the recommended dose for pot experiments), with three replicates. Irrigation with water of electrical conductivity from 0.7 dS m^-1 compromised the growth and gas exchanges of cotton cv. BRS 368 RF, and dry biomass of leaf, stem and root were the most sensitive variables to salt stress. The nitrogen-potassium combination of 100/75% of the recommendation for pot experiments resulted in higher growth in plant height, but the highest stomatal conductance of cotton cv. BRS 368 RF was recorded in plants cultivated with 75/50% N/K₂O, at 77 days after sowing. The variation in the N/K₂O combination did not interfere with biomass accumulation in cotton plants. The treatment with water of lowest salinity (0.7 dS m^-1) and the combination of 160/125% of the recommendation promoted greater leaf expansion, at 107 days after sowing.

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