Enhanced-efficiency phosphorus fertilizer: promising technology for carrot crop

Adilson Pelá,Luiz Hb Cirino,Rafael U Bento,Roberto A Reis Júnior,Matheus A Ribeiro

doi:10.1590/s0102-053620180411

Adilson Pelá, Luiz Hb Cirino + Show 3 more

Open Access

https://doi.org/10.1590/s0102-053620180411

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Journal: Horticultura Brasileira	Publication Date: Dec 1, 2018
Citations: 6	License type: cc-by

Affiliation: Universidade Estadual de Goiás

Abstract

ABSTRACT Several studies were carried out to evaluate polymer-coated mineral fertilizers; however, few studies, on the agronomic efficiency of these fertilizers in the field in carrot crop, are available. Thus, we aimed to evaluate the use of enhanced-efficiency phosphorus fertilizer coated with polymers in carrot (Daucus carota). The experiment was carried out in field, in Ipameri-GO. The experimental design was randomized blocks, arranged in an incomplete factorial design (5x2)+1, considering five phosphorus doses (150, 300, 450, 600 and 750 ha-1 kg P2O5), two P sources [conventional MAP (monoammonium phosphate) and polymer-coated MAP (Policote)] and one additional treatment (control, without P). The evaluated traits were plant height, root length, root diameter, total productivity, marketable root classes, agronomic efficiency of phosphate fertilization and P content in the roots. Data were submitted to analysis of variance and regression. Phosphate fertilization did not influence the P content in carrot roots, but increased plant height, root length and diameter and yield of carrot roots. Polymer-coated phosphate increased plant height, length, diameter and productivity of carrot roots, when compared to conventional fertilizer. Carrot productivity was, on average, 15.5% higher with polymer-coated P source (39.42 t ha-1) than with the conventional P source (34.11 t ha-1). Marketable roots were also improved with the use of polymer-coated phosphate fertilizer. Phosphate fertilizer coated with polymer increased the agronomic efficiency of phosphate fertilization in the carrot crop.

Highlights

Existem diversos estudos para avaliação das características químicas dos fertilizantes minerais recobertos por polímeros, porém, são escassas as pesquisas que avaliam a eficiência agronômica dos mesmos a campo na cultura da cenoura
This study aimed to evaluate the efficiency of phosphorus source coating with Policote brand polymer in development, quality and productivity of carrot crop
P content in roots was not significantly influenced by phosphate fertilization, showing average values of 4.58 and 4.89 g kg-1 for MAP and polymer-coated MAP, respectively (Table 1). These P contents are higher than the ones observed by Ribeiro Filho et al (2011) evaluating carrot roots at 120 days after planting (3.27 g kg-1)

Summary

Introduction

Existem diversos estudos para avaliação das características químicas dos fertilizantes minerais recobertos por polímeros, porém, são escassas as pesquisas que avaliam a eficiência agronômica dos mesmos a campo na cultura da cenoura. Foram avaliados a altura de plantas, comprimento e diâmetro de raiz, além da produtividade total e classes comerciais das raízes, eficiência agronômica da adubação fosfatada e teor de P nas raízes. O adubo fosfatado revestido com polímero aumentou a altura de plantas, o comprimento e a produtividade de raízes de cenoura, em relação ao adubo sem revestimento. According to Novais et al (2007), the deficiency of P is one of the main reasons for the low agricultural production in most Brazilian soils In acid soils such as Cerrado soil, P content is limiting, and P fertilizations show low efficiency due to its large adsorption on soil mineral phase, predominantly of low reversibility, mainly in Fe and Al oxides (Schoninger et al, 2013). The situation becomes worse due to the fact that phosphate is a non-renewable natural resources, it is scarce and without substitutes, and should, be efficiently used (Lana, 2009)

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