ACÚMULO DE NITRATO NA ALFACE E RÚCULA EM RESPOSTA À ADUBAÇÃO NITROGENADA DAS CULTURAS EM CONSÓRCIO

Aurélio Paes Barros Júnior; Arthur Bernardes Cecílio Filho; Bráulio Luciano Alves Resende; Hamurábi Anizio Lins

doi:10.1590/1983-21252020v33n128rc

Authors

Aurélio Paes Barros Júnior Department of Agronomic and Forest Sciences, Universidade Federal Rural do Semi-Árido, Mossoró, RN http://orcid.org/0000-0002-6983-8245
Arthur Bernardes Cecílio Filho Department of Plant Production, Universidade Estadual Paulista Júlio de Mesquita Filho, Jaboticabal, SP http://orcid.org/0000-0002-6706-5496
Bráulio Luciano Alves Resende Department of Plant Production, Instituto Federal de Educação, Ciência e Tecnologia do Sul de Minas Gerais, Muzambinho, MG https://orcid.org/0000-0001-9678-5778
Hamurábi Anizio Lins http://orcid.org/0000-0002-4548-9108

DOI:

https://doi.org/10.1590/1983-21252020v33n128rc

Keywords:

Lactuca sativa. Eruca sativa. System of cultivation and nutritional quality.

Abstract

In the cultivation of leafy vegetables, it is common to apply high amounts of nitrogen fertilizer. The imbalance between the absorption and the use of nitrogen (N) by the plant increases the nitrate content and decreases the quality of the vegetables because nitrate has a strong association with compounds harmful to human health. On the other hand, there is a lack of information on how N dose in intercropping, in order to improve yield, affects the quality (nitrate content) of vegetables. Thus, the objective of this study was to evaluate the nitrate content of intercropped lettuce and rocket, with nitrate content acting as a function of the nitrogen dose applied to these crops. The experiment was carried out at UNESP, Jaboticabal, SP, from September to December 2006. The experimental design was a complete randomized block design with four replications. The treatments were arranged in a 4 × 4 + 2 factorial scheme, with four varying concentrations of N each for lettuce and rocket (0, 65, 130 and 195 kg ha^-1 of N), plus two treatments corresponding to lettuce and rocket monocrops. Nitrate content in lettuce under intercropping is 42% less compared to that in the monocrop. Increasing nitrogen concentrations increased nitrate levels for lettuce and rocket under intercropping; however, these levels are below those found for their respective monocrops.

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