Sowing dates and node emission in buckwheat cultivars

Authors

DOI:

https://doi.org/10.5433/1679-0359.2021v42n1p105

Keywords:

Vegetative development, Fagopyrum esculentum Moench, Final number of nodes, Period of node emission, Rate of node appearance.

Abstract

The aim of this study was to determine the rate of node appearance (RNA), the final number of nodes (FNN) and the period of node emission (PNE) in two buckwheat cultivars (Fagopyrum esculentum Moench) for different sowing dates, and to check variability in the RNA, FNN and PNE between the cultivars and sowing dates. The IPR91-Baili and IPR92-Altar cultivars were evaluated for 29 and 31 sowing dates from October to May in the 2017/2018 and 2018/2019 agricultural years respectively. In each experiment, a completely randomised design with five replications was used. The number of nodes (NN) on the main stem was counted twice a week in each plant (replication), from emission of the first node until the end of the cycle. The linear regression (y = a + bx) of the number of nodes (NN, y) was adjusted for each plant based on the number of days after emergence (DAE, x). The rate of node appearance (RNA), in days node-1, was determined from the inverse of the slope of the linear regression between NN and DAE (RNA = 1/b). The RNA was calculated for the period of node emission (PNE, in days), i.e. from emergence to emission of the last node. The final number of nodes (FNN) was counted at the end of node emission. Variability was found in the rate of node appearance (RNA), the final number of nodes (FNN) and the period of node emission (PNE) between the cultivars and sowing dates. The rate of node appearance ranges between 2.20 and 8.23 days node-1, the final number of nodes between 2.20 and 17.20, and the period of node emission between 16.60 and 49.20 days. Plants of the IPR91-Baili and IPR92-Altar cultivars show better vegetative development (lower RNA, higher FNN and greater PNE) when sown in November, December, January and February, compared to those sown in October, March, April and May.

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Author Biographies

Alberto Cargnelutti Filho, Universidade Federal de Santa Maria

Prof., Universidade Federal de Santa Maria, UFSM, Santa Maria, RS, Brasil.

Ismael Mario Márcio Neu, Universidade Federal de Santa Maria

Discente do Curso de Doutorado do Programa de Pós-Graduação em Agronomia, UFSM, Santa Maria, RS, Brasil.

Rafael Vieira Pezzini, Universidade Federal de Santa Maria

M.e em Agronomia, Programa de Pós-Graduação em Agronomia, UFSM, Santa Maria, RS, Brasil.

Gabriel Elias Dumke, Universidade Federal de Santa Maria

Discente do Curso de Graduação em Agronomia, UFSM, Santa Maria, RS, Brasil.

Felipe Manfio Somavilla, Universidade Federal de Santa Maria

Discente do Curso de Graduação em Agronomia, UFSM, Santa Maria, RS, Brasil.

Samanta Luiza da Costa, Universidade Federal de Santa Maria

Discente do Curso de Graduação em Agronomia, UFSM, Santa Maria, RS, Brasil.

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Published

2021-01-19

How to Cite

Cargnelutti Filho, A., Neu, I. M. M., Pezzini, R. V., Dumke, G. E., Somavilla, F. M., & Costa, S. L. da. (2021). Sowing dates and node emission in buckwheat cultivars. Semina: Ciências Agrárias, 42(1), 105–122. https://doi.org/10.5433/1679-0359.2021v42n1p105

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