Grain Yield Differences of Soybean Cultivars Due to Solar Radiation Interception - American Journal of Plant Sciences

AJPS > Vol.8 No.11, October 2017

Grain Yield Differences of Soybean Cultivars Due to Solar Radiation Interception ()

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Download as PDF (Size: 1094KB) PP. 2795-2810

DOI: 10.4236/ajps.2017.811189 1,102 Downloads 2,852 Views Citations

Author(s)

Mariele Müller¹, Miroslava Rakocevic², Andréia Caverzan¹, Geraldo Chavarria^1*

Affiliation(s)

¹Faculty of Agronomy and Veterinary Medicine, Agronomy Post-Graduate Program, University of Passo Fundo, Passo Fundo, Brazil.
²Embrapa Agriculture Informatics, Campinas, Brazil.

ABSTRACT

Soybean [Glycine max (L.) Merr.] growth rate and grain yield are modified by the interception and solar radiation use efficiency. Thus, it is desirable that the most of plant photosynthetic structures intercepting solar radiation in order to have increment in carbon fixation and reflection on growth and yield. The goal of this study was to assess if soybean cultivars differ in grain yield in relation to solar radiation interception. Four soybean cultivars were evaluated at stages V6, V9, R2, R4, R6 and R8. To determine the photosynthetically active radiation interception by the canopy, the plants were divided into two parts (upper and lower strata). For grain yield components, the plants were divided into three parts (upper, middle and lower thirds). Of the photosynthetically active radiation intercepted by the vegetative canopy at the reproductive stages, the maximum observed intercept was 5.2% in the lower stratum of the plants. The number of infertile nodes increased in the lower third of plants due to low interception of solar radiation in this plant region. Thus, the soybean cultivars more efficient in intercepting photosynthetically active radiation inside the vegetative canopy showed higher grain yields.

KEYWORDS

Glycine Max, Leaf Area Index, Efficiency of Solar Radiation Interception, Extinction Coefficient, Solar Radiation Use Efficiency

Share and Cite:

Müller, M. , Rakocevic, M. , Caverzan, A. and Chavarria, G. (2017) Grain Yield Differences of Soybean Cultivars Due to Solar Radiation Interception. American Journal of Plant Sciences, 8, 2795-2810. doi: 10.4236/ajps.2017.811189.

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