Relationship between grain yield of soybeans and meteorological variables

Authors

  • Moacir A. Berlato
  • Denise Cybis Fontana "Universidade Federal do Rio Grande do Sul, Faculdade de Agronomia, Departamento de Plantas Forrageiras e Agrometeorologia.
  • Hélio M. Gonçalvez

DOI:

https://doi.org/10.1590/S1678-3921.pab1992.v27.3700

Keywords:

<i>Glycine max</i>, predicting crop production, sowing periods, rainfall, reproductive period, water balance

Abstract

The objective of this study was to estimate correlations between original and derivated meteorological variables and grain yield of soybeans during different plant growth periods. Data used for this analysis were originated from experiments conducted in five locations of Rio Grande do Sul State, Brazil, from 1971/72 to 1983/84. The results show that, for the recommendable sowing period, temperature is not a limitative factor for soybean grain yield in the most important croping areas of the State. The original variable rainfall was highly correlated with grain yield only during the reproductive period. Derivated variables (P/ETo and ET/ETo) were better related with grain yield as compared to rainfall either for vegetative or reproductive periods. The ET/ETo index exhibited the best correlations with grain yield. As a consequence, it is the most indicated variables to be used in models involving climate-soybean grain yield relationships. The results also show that reproductive period is the most critical to water deficit. This period usually occurs from mid January to mid March for all three maturity groups in Rio Grande do Sul.

Published

1992-05-01

How to Cite

Berlato, M. A., Fontana, D. C., & Gonçalvez, H. M. (1992). Relationship between grain yield of soybeans and meteorological variables. Pesquisa Agropecuaria Brasileira, 27(5), 695–702. https://doi.org/10.1590/S1678-3921.pab1992.v27.3700

Issue

Section

CLIMATOLOGY