Potassium sources and calcium and magnesium doses in carrot crop fertilization

José Luiz R Torres,Fabio J Carvalho,João Rodrigues Neto,Hamilton César De O Charlo,Daniel P Pereira

doi:10.1590/s0102-0536-20210201

José Luiz R Torres, Fabio J Carvalho + Show 3 more

Open Access

https://doi.org/10.1590/s0102-0536-20210201

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Abstract

ABSTRACT Fertilization has an important influence on carrot productivity and on the quality of the produced root, being responsible for most of the production cost of the crop. In this context, we evaluated the use of potassium (K) sources associated with calcium (Ca) and magnesium (Mg) doses in carrot cultivation. In a randomized block design in a triple factorial scheme (2x2x2), we evaluated two doses and sources of potassium [potassium chloride (KCl), 120 kg ha-1 of K2O; potassium sulfate (K2SO4) 120 kg ha-1 of K2O + 42,5 kg ha-1 of S]; Two doses of Mg [magnesium sulfate (MgSO4), zero kg ha-1 of Mg; 25 kg ha-1 of Mg + 34,2 kg ha-1 of S]; two doses of the commercial algae product Lithothamnium calcareum as an alternative source of Ca [zero kg ha-1 of seaweed; 200 kg ha-1 of seaweed (24 kg ha-1 of Ca)], all with six replications. Total productivity, 3A, commercial and percentage of discard carrot were evaluated. Regardless of the source of K used, the carrot production was median (above 40 t ha-1), with no application of Ca or Mg. The application of 25 kg ha-1 of Mg and zero Ca altered the Ca:Mg ratio in the soil and provided a significant increase in yield when KCl was used. The association of L. calcareum algae with KCl reduces total yield and increases carrot disposal.

Highlights

A adubação tem importante influencia na produtividade da cenoura e na qualidade da raiz produzida, sendo responsável pela maior parte do custo de produção da cultura
A utilização da alga L. calcareum como fonte de Ca proporcionou aumento da produção quando associado com a aplicação de 25 kg ha-1 de Mg via MgSO4 e quando a fonte de K foi K2SO4
Carrot (Daucus carota subsp. sativus) is among the five most cultivated vegetables in Brazil, and the state of Minas Gerais is its largest producer, with 7.1 thousand hectares of planted area, and an average productivity of 39.7 t ha-1, which corresponds to 40% of the national production; about 80% of this is located in the Alto Paranaíba and Triângulo Mineiro regions (Beling, 2017)

Summary

Introduction

A adubação tem importante influencia na produtividade da cenoura e na qualidade da raiz produzida, sendo responsável pela maior parte do custo de produção da cultura.

Results

Conclusion