Schwerz Felipe, Caron Braulio O, Elli Elvis F, Stolzle John R, Medeiros Sandro L P, Sgarbossa Jaqueline, Rockenbach Ana P
Departamento de Engenharia Agrícola, Universidade Federal de Lavras/UFLA, Lavras, MG, Brazil.
Departamento de Ciências Agronômicas e Ambientais, Universidade Federal de Santa Maria, Frederico Westphalen, RS, Brazil.
An Acad Bras Cienc. 2019;91(3):e20180066. doi: 10.1590/0001-3765201920180066. Epub 2019 Sep 9.
Despite its economic importance, the microclimate in soybean canopies has not yet been studied in detail. Such a study can yield valuable information regarding the interaction of a crop with its environment. In this context, the aim of this study was to evaluate the solar radiation dynamic and yield responses for each canopy strata for two soybean cultivars with determined and undetermined growth habits. A field study was conducted during the 2013/2014 and 2014/2015 growing seasons in the city of Frederico Westphalen, Rio Grande do Sul, Brazil. The cultivar NA6411, with a determinate growth habit, presented a greater interception of radiation in the middle and lower canopies strata which results in higher soybean yield when compared to the cultivar TEC6029, and thus, can be recommended for cultivation in crop production systems. The contribution of the middle and upper canopy strata to the total yield formation was greater than that observed in the lower canopy strata due to the greater interception of solar radiation by these strata. To increase soybean yields, new studies regarding the microclimatic conditions of the soybean canopy should be developed to improve the maximum potential yield of the new soybean cultivars.
尽管大豆冠层的小气候具有经济重要性，但尚未得到详细研究。这样的研究可以产生关于作物与其环境相互作用的有价值信息。在此背景下，本研究的目的是评估两个具有有限和无限生长习性的大豆品种各冠层的太阳辐射动态和产量响应。在巴西南里奥格兰德州弗雷德里科·韦斯法伦市2013/2014年和2014/2015年生长季节进行了田间研究。具有有限生长习性的品种NA6411，与品种TEC6029相比，在冠层中部和下部对辐射的截获量更大，从而导致大豆产量更高，因此，可推荐用于作物生产系统中的种植。由于冠层中部和上部对太阳辐射的截获量更大，它们对总产量形成的贡献大于冠层下部。为了提高大豆产量，应开展关于大豆冠层微气候条件的新研究，以提高新大豆品种的最大潜在产量。
