Phosphorus sources associated with organic compound in broccoli production and soil chemical attributes

Lidiane F Colombari,Dirceu M Fernandes,Antonio Ismael Inácio Cardoso,Priscilla Nátaly De L Silva,Natália Bl Lanna

doi:10.1590/s0102-053620190215

Lidiane F Colombari, Dirceu M Fernandes + Show 3 more

Open Access

https://doi.org/10.1590/s0102-053620190215

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Abstract

ABSTRACT Phosphorus is a finite natural resource and the use of gradual-release phosphate sources, associated with an organic compound may favor a more rational use of this nutrient, since organic matter protects P from soil fixation. The aim of this study was to evaluate the effect of phosphorus sources application, associated with organic compound at planting, on single inflorescence type broccoli production and soil chemical properties at the end of the cycle. Eight treatments were evaluated, in a 4 x 2 factorial scheme, using four phosphorus sources [thermophosphate (TM), natural phosphate (NP), reactive natural phosphate (RNP) and triple superphosphate (TSP)]; in the presence (55 t ha-1) and absence of organic compound Visafértil® at planting. The experimental design was randomized blocks, with four replicates. TSP source presented higher P contents. TM source showed, in the absence of organic compound, higher pH and contents of organic matter, Ca, Mg, SB and V%. In the presence of organic compound, NP source provided higher contents of organic matter and K. The addition of organic compound increased pH and resulted in higher contents of P, K, Ca, SB, CEC and V%. The presence of organic compound favored higher productivity for the sources TM, NP and TSP. Among these sources, TSP provided the highest production both in the presence or absence of organic compound, considering that NP source was the only one which did not differ from TSP for inflorescence fresh weight and productivity, both in the presence and in the absence of organic compound. We concluded that TSP and NP are the best P sources, associated with the application of organic compound.

Highlights

Fontes de fósforo associadas ao composto orgânico na produção de brócolis e atributos químicos do solo
Interaction among phosphorus sources in the presence and absence of organic matter was significant for inflorescence fresh weight, estimated productivity and cycle
No difference among treatments was noticed and values obtained in the treatments, 13.9 to 14.6 cm (Table 1), were within the range considered optimal for fresh market, from 12 to 15 cm (Melo, 2015)

Summary

Introduction

Fontes de fósforo associadas ao composto orgânico na produção de brócolis e atributos químicos do solo. Na ausência do composto orgânico, a fonte TM resultou em maior pH e teores de MO, Ca, Mg, SB e V%. A presença de composto orgânico resultou em maior produtividade para as fontes TM, NP e TSP. Phosphate from rocks, hyperphosphates and thermophosphates are some P sources allowed for organic cultivation (Brazil, 2014), which can be used in conventional cropping. These sources present a slower P dissolution in relation to soluble phosphate sources, giving immediate and/or residual effect on subsequent crops (Novais et al, 2007). Triple superphosphate is the most commonly used fertilizer, since its dissolution in soil is fast, favoring immediate use by the plant

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