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Cultivation of colored cotton irrigated with saline water under potassium and nitrate/ammonium fertilization

2016; Academic Journals; Volume: 11; Issue: 1 Linguagem: Inglês

10.5897/ajar2015.10540

1991-637X

Soares de Lima Geovani, Dantas de Oliveira Luan, Raj Gheyi Hans, Almeida dos Anjos Soares Lauriane, Feitosa de Lacerda Claudivan, Batista dos Santos Jo atilde o, Medeiros de Ara uacute jo Ben iacute cio,

Soil Management and Crop Yield

This study aimed to evaluate growth and production components of the colored cotton cultivar ‘BRS Topázio’ irrigated with saline water as a function of dose of potassium and proportions of nitrate and ammonium. The study was conducted in drainage lysimeters under greenhouse conditions, in a eutrophic Gray Argisol of sandy clay loam texture, in the municipality of Campina Grande, Brazil, from November 2014 to March 2015. A randomized block design was used to test five doses of potassium-DK (50, 75, 100, 125 and 150% of the recommendation for pot experiments) and five proportions of nitrate and ammonium-PNA (100/0, 75/25, 50/50, 25/75 and 0/100 mg of N kg-1 of soil). The K dose referring to 100% corresponded to 150 mg of K2O kg-1 of soil. N supply in NO3-/NH4+ proportion of 25/75, promoted increase in growth variables (plant height, stem diameter and leaf area) and mass of cotton bolls. The K dose of 145.5 mg of K2O kg-1 of soil promoted the formation of higher number of bolls plant-1. The application of K in the doses of 112.5 and 187.5 mg of K2O combined with 25/75 and 0/100 mg of NO3-/NH4+ promoted increment in cottonseed mass and the dose of 187.5 mg of K2O associated with 25/75 mg of NO3-/NH4+ increased the number of days for flower bud opening. Key words: Gossypium hirsutum L., saline stress, mineral nutrition