Desenvolvimento e rendimento agrícola na cultura da soja (&gt;i&lt;Glycine max&gt;/i&lt; (L.) Merrill) sob diferentes fontes de nitrogênio

Jendiroba, Eloisa

doi:10.11606/d.11.2019.tde-20191108-095019

Cited by 1 publication

(1 citation statement)

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“…Soybean yield response to small N amounts should be expected only in N‐deficient soils (Dadson and Acquaah, 1984), which is not the case of soils from the Center‐South region of Paraná, southern Brazil with high SOM (SOM > 41 g kg −1 ; Table 1) (Fontoura and Bayer, 2009). Lack of yield response to starter N is consistent with previous studies in Brazil (Jendiroba and Câmara, 1994; Mendes et al, 2003; Hungria et al, 2006; Aratani et al, 2008; Balbinot Junior et al, 2016) and around the world (Herridge and Brockwell, 1988; Mrkovački et al, 2008; Josipović et al, 2011; Kamara et al, 2012; Janagard and Ebadi‐Segherloo, 2016) with diverse soil and weather conditions.…”

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confidence: 90%

Assessing Nitrogen Limitation in Inoculated Soybean in Southern Brazil

Ambrosini

Fontoura

Moraes

et al. 2019

Agrosystems Geosci & Env

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Soybean yield did not respond to low starter fertilizer N rates in soils with high organic matter content. Nitrogen limitation tended to be greater in low compared with medium‐high yield levels. Nitrogen limitation is potentially related to lower contribution of N coming from biological nitrogen fixation (BNF) and mineralization. Overcoming potential N limitation in soybean [Glycine max (L.) Merr.] is a critical factor for sustaining plant nutrient demand and improving productivity. Following this rationale, a set of studies were executed in southern Brazil with the goals of quantifying yield response to early season fertilizer N rates (up to 40 kg ha−1), “starter N fertilization,” and to understand if soybean seed yields are limited by N (testing a non‐limiting N scenario) when grown in soils with medium to high organic matter content. The main key outcomes of this research were: (i) starter N fertilization did not increase yields compared with non‐fertilized soybean, potentially highlighting the absence of an early season N limitation; and (ii) N limitation was observed when soybean yields were compared with non‐limiting N scenario and it tended to be greater in low compared with medium‐high yield levels, potentially connected with co‐limitations on both N sources (N2 fixation and mineralization) to satisfy soybean N demand. Producing soybean in a sustainable manner implies focus on production practices to conserve and, potentially, to increase soil organic matter on a long‐term basis. Furthermore, it requires enhancing the biological N2 fixation process for satisfying the large plant N demand for achieving high soybean yields. Future research should be focused on understanding factors governing biological N2 fixation and N mineralization processes in soybean grown in soils with medium‐high organic matter content.

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