Rates of paclobutrazol on soil microbial biomass

Authors

  • Deusiane Batista Sampaio Universidade Federal do Ceará
  • Valdinar Bezerra dos Santos Universidade Estadual do Piauí
  • Ademir Sérgio Ferreira de Araújo Universidade Estadual do Piauí

DOI:

https://doi.org/10.5433/1679-0359.2010v31n4Sup1p1349

Keywords:

Plant growth regulator, Microorganisms, Soil quality

Abstract

The aim of this work was to evaluate the effect of rates of paclobutrazol on soil microbial biomass, respiration and respiratory quotient (qCO2). The treatments consisted of six rates of paclobutrazol: 0, 8, 16, 32, 64, and 128  mg a.i. per kg-1 of a Neossol, corresponding to 0x, 1x, 2x, 4x, 8x and 16x of rate recommended for application in field. The soil samples were incubated during 60 days and evaluations of soil microbial biomass, CO2 release and qCO2 were done at 1, 7, 15, 30 and 60 days. Initially, there was a decrease in soil microbial biomass content after application of paclobutrazol that increased after 15 days. The compound increased soil respiration until 30 days. The qCO2 increased in the treatments with higher rates than 16  mg a.i. per kg-1 of soil. Application of paclobutrazol caused an initial decreasing on soil microbial biomass.

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Author Biographies

Deusiane Batista Sampaio, Universidade Federal do Ceará

Engenheira Agrônoma, Mestranda do Curso de Pós-Graduação em Ciência do Solo da Universidade Federal do Ceará, UFC.

Valdinar Bezerra dos Santos, Universidade Estadual do Piauí

Professor Dr. da Universidade Estadual do Piauí, UESPI, Campus de Parnaíba, Parnaíba, PI.

Ademir Sérgio Ferreira de Araújo, Universidade Estadual do Piauí

Professor Dr. da Universidade Federal do Piauí, UFPI, Centro de Ciências Agrárias, Teresina, PI. Bolsista de Produtividade de Pesquisa do CNPq.

Published

2011-02-10

How to Cite

Sampaio, D. B., Santos, V. B. dos, & Araújo, A. S. F. de. (2011). Rates of paclobutrazol on soil microbial biomass. Semina: Ciências Agrárias, 31(4Sup1), 1349–1354. https://doi.org/10.5433/1679-0359.2010v31n4Sup1p1349

Issue

Section

Communication

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