Tillering and dry matter accumulation in individual plants of oat with different moments of defoliation

  • A. M. Bazán Universidad Nacional de La Pampa, Facultad de Agronomía
  • F. R. Delfino Universidad Nacional de La Pampa, Facultad de Agronomía
  • C. M. Ferri Universidad Nacional de La Pampa, Facultad de Agronomía
  • M. A. Brizuela Universidad Nacional de Mar del Plata, Facultad de Ciencias Agrarias. Balcarce, Buenos Aires

Keywords:

oat, early defoliation, tillering, dry matter accumulation

Abstract

The objective of this study was to evaluate, at individual plant level, the effect of early defoliation on the dynamics of tillering and dry matter (O M) accumulation in oat (Avena byzantina e. Koch.) cv. Milagros INTA. The study was carried out at Santa Rosa (La Pampa, Argentina) during the 2007 growing season with oat seeds sowed on March 4. The treatments consisted of a control (without defoliation) and two initial defoliation times, and three harvest dates. The beginning of defoliation was established according the number of expanded leaves: three (early) and six (tillering). The experimental design was completely randomized with a factorial arrangement of treatments (defoliation x harvest date) and three replicates. Defoliation treatments were generated on April 5 (early) and on May 3 (tillering) by cuts to a height of 5 cm. The dynamics of tiller density and DM accumulation were evaluated in three dates: one early on June, and the other two with a 30 day frecuency. The tiller density and DM accumulation of individual oat plants with early defoliation and without defoliation showed a similar pattern (p>0.05). On contrary, plants with late defoliation showed lower values (p<0.05) in both variables. Under the condition of this study, it is possible to conclude that early defoliation did not promote neither tillering nor dry matter accumulation, in tillering both variables get depressed.

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Published

2020-04-01

How to Cite

Bazán, A. M., Delfino, F. R., Ferri, C. M., & Brizuela, M. A. (2020). Tillering and dry matter accumulation in individual plants of oat with different moments of defoliation. Semiárida, 20, 33–40. Retrieved from https://ojs.unlpam.edu.ar/index.php/semiarida/article/view/4557

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Section

Artículos Científicos y Técnicos