Graphical analysis of nitrogen and sulfur supply on yield and related traits of canola in eastern Canada

L., B.; Silva, N. de; Whalen, Joann K.; Pageau, Denis; Vanasse, Anne; Earl, Hugh J.; Smith, Donald L.

doi:10.1007/s10705-020-10097-3

Cited by 12 publications

(7 citation statements)

References 34 publications

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“…This multiple-year (2012-2014) study composed of 12 treatment combinations with three levels of S (0, 20, and 40 kg ha -1 ) and four levels of N (50, 100, 150 and 200 kg N ha -1 ) rates. The results showed that the growing season had a significant effect on the SUE of different treatments (Ma et al 2020). These results indicate that the effect on SUE among years was not consistent when applied N rates were considered; however, it confirmed that the highest SUE rate corresponded with 20 kg ha -1 for a given level of N and additional S did not always improve SUE.…”

Section: Effect Of Field Management Practices On Suementioning

confidence: 83%

Main factors affecting nutrient and water use efficiencies in spring canola in North America: a review of literature and analysis

2022

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Improving nutrient and water use efficiencies through optimizing field management practices are important strategies to increase economic and environmental sustainability of canola production in North America. The objective of this study was to review recent research publications and quantitatively assess the impact of field management practices on the efficiency of water and selected macro-nutrients (nitrogen (N) and sulfur (S)) in canola and to identify the most effective cultural practices for improved efficiencies. Results showed that, overall, the addition of nitrogen and sulfur inputs in studies across North America increased yield but had a negative impact on nitrogen use efficiency (NUE) and sulfur use efficiency (SUE) as compared to corresponding controls. Split applied N in spring can improve NUE, but these improvements are mostly dependent on the soil moisture content. SUE is improved when N is supplied to complement the S application. Sulfate forms of S are more readily available and should be applied early in the season, whereas elemental S must be applied in the fall to improve SUE. Maintenance of adequate soil moisture conditions during the reproductive phase of the canola crop improves WUE. Supplementary irrigation improves SUE, but most canola is grown under rain-fed conditions in North America. Maintaining tall stubble until spring, then incorporating it with N improved WUE in canola. In summary, our analyses suggest that further research is required on the integration of canola genotypes with improved nutrient and water use efficiencies and effective management.

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Section: Effect Of Field Management Practices On Suementioning

confidence: 83%

Main factors affecting nutrient and water use efficiencies in spring canola in North America: a review of literature and analysis

2022

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“…Hence, maize and soybean plants were wilted during the seed-filling period and crop yields were severely affected. In 2016, growing season precipitation at all three sites were much lower than normal, and due to the moderate heat stress, overall crop productivity was severely affected at all three sites (Ma et al 2020). In 2018, the combined heat and drought stress during the critical growth stage of canola reduced canola and wheat yields substantially in Ottawa.…”

Section: Discussionmentioning

confidence: 96%

“…Agro-climatic conditions at these sites ranged from northern temperate at Ottawa to humid continental climate at Canning. The seasonal daily mean temperature, precipitation and soil characteristics of these sites are described in detail by Ma et al (2020) and Wen et al (2021). Topsoil (0-30 cm depth) samples were analyzed prior to the start of the experiment and results are presented in Table 1.…”

Section: Site Descriptionsmentioning

confidence: 99%

Canola productivity and carbon footprint under different cropping systems in eastern Canada

Liang

Herath

et al. 2023

Nutr Cycl Agroecosyst

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Diversified crop rotation with an appropriate sequence may be a promising strategy for increasing crop productivity while reducing greenhouse gas emissions (GHGs) and lowering carbon (C) footprint for more sustainable agricultural systems. The objectives of this study were to (i) assess the agronomic performance and C footprint of canola (Brassica napus L.) production in different cropping systems, and (ii) better understand how canola could be adapted to existing cropping systems in eastern Canada. A four-year canola-based phase rotation study, including maize (Zea mays L.), wheat (Triticum aestivum L.), and soybean (Glycine max L.), started in 2011 and continued for two cycles in Ottawa, ON; Montreal, QC; and Canning, NS. It was found that, compared to continuous monoculture (canola, maize or wheat), diversified cropping systems increased crop yields by an average of 32% and reduced the C footprint of all rotations by 33%, except under severe heat and drought conditions. The effect of rotation on yield and C footprint of canola production varied significantly among site-years. At Ottawa, the canola following soybean (SC) had 12% higher canola yield than monoculture canola (CC), 5 and 8% higher canola yield than canola following wheat (WC) or maize (MC). At Montreal, canola yield ranked as MC > SC > WC > CC. At Canning, the highest canola yield was in WC (21%) and SC (13%). Overall, most SC rotations had the lowest C footprint, and CC cropping had the highest C footprint, with only a few exceptions. Regardless of the cropping system, canola required more N input and was high in oil and protein in the harvested product, and produced the highest C footprint, while soybean had the lowest C footprint at all three sites. Our findings indicate that a diversified cropping system with canola production following soybean significantly improved canola yield while lowering the C footprint. However, profitable and sustainable canola production in eastern Canada is threatened by climate change-induced drought and heat stress.

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“…The data were tested for normality and for homogeneity before PCA analysis. The final output of the PCA is ordination diagrams illustrated in a biplot, where a positive correlation is expected if the arrows of two variables point in the same direction, and vice versa (Ma et al., 2020). All 47 explainable parameters were grouped into four classifications, including (a) pod fertility and the associated variables, (b) seed yield and root‐related traits, (c) risk of crop lodging and lodging‐related variables, and (d) anatomical parameters, to generate four independent PCA groups.…”

Section: Methodsmentioning

confidence: 99%

Crop lodging, pod fertility and yield formation in canola under varying degrees of short‐term heat stress during flowering

Duncan

2021

J Agronomy Crop Science

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There has been little research on crop lodging and yield determination in response to varying degrees of heat stress in canola. This research aimed to examine root morphology, pod fertility, seed yield and crop lodging of two canola genotypes subjected to normal temperature (23/17°C, light/dark, as CK), and three elevated temperature regimes imposed at flowering for a short term (10 days), namely CK+2 (25.0/22.0°C, light/dark), CK+4 (27.0/24.0°C) and CK+6 (29.0/26.0°C), in a controlled growth facility. Elevated temperature treatment, CK+4 and CK+6, displayed a significant adverse effect on seed yield and stem lodging. Compared to the CK, a significant yield loss of 35.6% and 48.7% in CK+4 and CK+6, respectively, was mainly due to poor pod fertility. This was evident from the smaller number of total filled pods (−21% in the CK+4 and −25% in the CK+6), low success ratio of pod developed (−25%, CK+4 and −29%, CK+6) and poor pollen viability (−36%, CK+4 and −50%, CK+6), averaged across both genotypes. Lateral root development was sensitive to the elevated temperature treatment, showing significant reductions in the lateral root morphology (8.0%-28.5%), while the taproot was relatively tolerant to the elevated temperature stress. A strong relationship between root electrical capacitance and lateral root morphology (R 2 > .74**) indicates that electrical measurements could be used as a non-destructive method for evaluating root parameters under elevated temperatures. Higher risk of stem lodging (21.4% lower stem safety factor) compared to the CK was evident under severe elevated temperature stress, as ascribed from the reduced stem bending strength that was caused by the deteriorating stem mechanical properties such as decreased flexural rigidity and weakened vascular bundle size (i.e. stunted fibre cell, and thinned size of fibre wall, deteriorated secondary xylem and smaller secondary phloem). These results were further verified by the principal component analysis and structural equation model. The root lodging risk was not influenced by the elevated temperature regime, primarily due to the unaffected anchorage strength and height of the centre of gravity. This information will be useful in improving lodging resistance and alleviating the related impact of heat stress in canola.

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Graphical analysis of nitrogen and sulfur supply on yield and related traits of canola in eastern Canada

Cited by 12 publications

References 34 publications

Main factors affecting nutrient and water use efficiencies in spring canola in North America: a review of literature and analysis

Main factors affecting nutrient and water use efficiencies in spring canola in North America: a review of literature and analysis

Canola productivity and carbon footprint under different cropping systems in eastern Canada

Crop lodging, pod fertility and yield formation in canola under varying degrees of short‐term heat stress during flowering

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