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Agronomy Journal Abstract - Pest Interactions In Agronomic Systems

Soil Factors Influencing Nematode Spatial Variability in Soybean

 

This article in AJ

  1. Vol. 109 No. 2, p. 610-619
     
    Received: Mar 17, 2016
    Accepted: Oct 05, 2016
    Published: March 9, 2017


    * Corresponding author(s): maramoitinho@gmail.com
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doi:10.2134/agronj2016.03.0160
  1. José Roberto Brito Freitasa,
  2. Mara Regina Moitinho *b,
  3. Daniel De Bortoli Teixeirab,
  4. Elton da Silva Bicalhob,
  5. João Fernandes da Silva Júniorb,
  6. Diego Silva Siqueirab,
  7. Bruno Flávio Figueiredo Barbosac,
  8. Pedro Luiz Martins Soaresb and
  9. Gener Tadeu Pereirab
  1. a Federal Univ. of Maranhão, Center for Agricultural and Environmental Sciences, Campus IV, 65500-000, Chapadinha, MA, Brazil
    b College of Agricultural and Veterinarian Sciences, São Paulo State Univ. (FCAV/UNESP), 14884-900, Jaboticabal, SP, Brazil
    c Center Univ. of Rio Verde, 15025-400, São José do Rio Preto, SP, Brazil
Core Ideas:
  • Spatial distribution P. brachyurus nematode is influenced by soil chemical properties.
  • In sites with low fertility the plants become more susceptible to nematode attack.
  • In sites concentrating greater amount Mg are favorable to greater number of nematode.

Abstract

The economic damage to Brazilian soybean [Glycine max (L.) Merr.] production attributed to Pratylenchus brachyurus has increased in recent years. The objective of this study was to determine the influence of soil properties on nematode variability in a soybean crop. Soil and root samples (0–0.20 m) were collected from 142 points in an area that was 180 by 180 m. Root samples were analyzed for nematodes, and soil samples were analyzed for chemical attributes. The data were analyzed using principal component analysis and geostatistics. The spatial variability maps of the attributes S, Ca, Mg, K, sum of bases, base saturation index, and cation exchange capacity were aligned with the water runoff direction. Soil organic matter and K were associated with very low number of nematodes in the root (NNR) (NNR ≤ 3614), low (3614 < NNR ≤ 10,496), and moderate (10,496 < NNR ≤ 21,248). On the other hand, the regions with high Mg, S, and soybean productivity were associated with regions with high (21,248 < NNR ≤ 43,648) and very high (NNR > 43,648) NNR. The findings indicated that soil chemical characteristics influence the population dynamics of the root-lesion nematode P. brachyurus.

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