Effect of artificial shading on soybean growth and yield

Abstract

Soybean (Glycine max) stands out in the agricultural scene, being one of the main sources of protein and oil for human and animal nutrition. The aim of this study was to evaluate the growth, radiation use efficiency, and the yield of soybean, cultivated under four levels of artificial shading to simulate the environment provided by an agroforestry system. A field experiment was conducted in Frederico Westphalen, Rio Grande do Sul, Brazil, from December 2015 to April 2016. The experimental design was completely randomized with four levels of shading (0, 30, 50, and 70%) as treatment, and eight collections of plants at specific growth stages. The growth and yield traits of the soybean crop are influenced differently as a function of shade levels. Thus, the simulation of an agroforestry system from artificial shading allowed the recommendation of soybean cultivation for intercropping systems, provided that the interception of solar radiation by the tree component is less than 30%, in order to enable soybean cultivation. Efeito do sombreamento artificial no crescimento e produtividade da sojaRESUMO: A soja (Glycine max) destaca-se no cenário agrícola mundial, sendo uma das principais fontes de proteína e óleo para nutrição humana e animal. O objetivo deste estudo foi avaliar o crescimento, a eficiência do uso da radiação e a produtividade da soja cultivada sob quatro níveis de sombreamento artificial visando similar o ambiente proporcionado por um Sistema agroflorestal. Um experiment de campo foi conduzido em Frederico Westphalen, Rio Grande do Sul, de dezembro de 2015 a abril de 2016. O delineamento experimental empregado foi o inteiramente casualizado com quatro níveis de sombreamento (0, 30, 50 e 70%) como tratamento, e oito coletas de plantas em estádios específicos de crescimento. As características de crescimento e produtivas da cultura da soja são influenciadas diferentemente em função dos níveis de sombreamento. Assim, a simulação de um Sistema agroflorestal a partir de sombreamento artificial permitiu a recomendação do cultivo da soja para sistemas consorciados, desde que a interceptação da radiação solar pelo componente arbóreo seja inferior a 30%, a fim de viabilizar o cultivo da soja. Palavras-chave: sistemas agroflorestais; Glycine max; análise de crescimento; variáveis meteorológicas; radiação solarEffect of artificial shading on soybean growth and yield Rev. Bras.

Agronomic performance of soybean crops under integrated production systems in the Southwestern Brazilian Amazon biome

“…The low yield in the 1 st row and in the DSE of 10% of the alley width can be explained by the competition of trees for light, since solar radiation is related to photosynthesis and physiological processes in soybean plants (Nicodemo et al, 2016). Soybean is a C3 plant that presents low solar radiation use efficiency (Tibolla et al, 2019). The limited radiation condition due to the forest component is related to decreases in photosynthesis and plant growth, resulting in low yields (Casaroli et al, 2007;Mantino et al, 2020).…”

Effect of Alar and Light Intensity on some Vegetative Growth Characteristics of Juniper Plant (Juniperus Sabina L.)

“…As in tables (1, 2, 4 and 5). This means that environmental factors, especially light intensity, played a major role in promoting the growth of juniper seedlings [35,36].The reason is attributed to the effect of low light intensity by 50% on the aforementioned traits (the length of the main branch and the length of the long and short branches). This leads to an increase in stem cell division as a result of an increase in the concentration of auxins in the plant with a decrease in light intensity [37,38].…”