Abstract

CASTRO, Bruno F. et al. Radish production function of the potassium fertilization and different nitrogen sources. Rev. de Ciências Agrárias [online]. 2016, vol.39, n.3, pp.341-348. ISSN 0871-018X.  https://doi.org/10.19084/RCA15131.

This study aimed to evaluate the response of radish to potassium fertilization and different nitrogen sources. The experimental design was a randomized block with treatments arranged in a factorial 5 x 2 (five doses of potassium, and two sources of nitrogen) with four replications. Potassium doses were 0, 40, 80, 120, and 160 kg ha^-1 of K₂O, and sources of nitrogen were ammonium sulfate ((NH₄)₂ SO₄) and urea (CO(NH₂)₂). 35 days after sowing the following variables were evaluated: root diameter, fresh root mass, root dry mass, leaf fresh mass, and leaf dry mass, leaf nitrogen content, number of marketable and non-marketable roots and crop productivity. Potassium application, regardless of the nitrogen supply, influenced radish performance and the dose of 103 kg ha^-1 K₂O promoted maximum productivity, under our experimental conditions. We conclude that, even in high soil potassium content, potassium fertilization should be recommended to obtain higher radish yield.

Keywords : interaction N x K; Nitrogen sources; Raphanus sativus L..

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