A novel approach for determining nitrogen requirement based on a new agronomic principle—sugarcane as a crop model

Sanches, Guilherme Martineli; Otto, Rafael

doi:10.1007/s11104-021-05263-7

Cited by 9 publications

(4 citation statements)

References 48 publications

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“…Adjusting the timing of N‐fertilizer application (Lofton and Tubaña 2015; de Castro et al 2022) and employing appropriate application methods (Borges et al 2019) have been found to reduce greenhouse gas (GHG) emissions and improve NUE in sugarcane. However, these actions alone are insufficient as a significant proportion of nitrogen becomes immobilized in the soil (Otto et al 2016; Quassi de Castro et al 2021; Sanches and Otto 2022).…”

Section: Discussionmentioning

confidence: 99%

“…Sugarcane, a high N demanding and a semi‐perennial crop, is usually grown in soil with low content of organic matter, requiring careful fertilization management to ensure optimal yield and longevity. Restoring exported nitrogen from harvested stalks and supplementing the ratoons are crucial for maintaining productive sugarcane fields (Dourado‐Neto et al 2010; Sanches and Otto 2022). N‐fertilization has been shown to mitigate the decline in stalk yield over multiple growing seasons (Quassi de Castro et al 2018; Tenelli et al 2019; Boschiero et al 2020).…”

Section: Discussionmentioning

confidence: 99%

“…Restoring exported nitrogen from harvested stalks and supplementing the ratoons are crucial for maintaining productive sugarcane fields (Dourado-Neto et al 2010;Sanches and Otto 2022). N-fertilization has been shown to mitigate the decline in stalk yield over multiple growing seasons (Quassi de Castro et al 2018;Tenelli et al 2019;Boschiero et al 2020).…”

Section: Fnf and The Importance For Sugarcane In Reducing Ghg Emissio...mentioning

confidence: 99%

“…It also participates in several physiological processes, acting directly in the production of energy and carbohydrates for sugarcane development (Hawkesford et al 2012; Robinson et al 2013; Bassi et al 2018). In sugarcane, nitrogen accounts for up to 2% of plant dry matter and is the second most required nutrient, with requirements ranging from 0.5 to 1.4 kg N Mg −1 of stalk (Robinson et al 2013; Cherubin et al 2019; Sanches and Otto 2022). Factors such as harvesting season length, plant varieties, soil type and management, and weather conditions contribute to variations in N requirements (Thorburn et al 2017; Dias and Sentelhas 2018; de Castro et al 2022).…”

Section: Introductionmentioning

confidence: 99%

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Optimizing foliar N‐fertilization in sugarcane depends on plant genotype and nitrogen concentration

Quassi de Castro,

Sermarini,

Rossi

et al. 2023

Physiologia Plantarum

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Foliar N‐fertilization (FNf) has emerged as a promising approach to synchronize plant nitrogen (N) demands and application timing, reducing the N losses to the environment associated with traditional soil‐based fertilization methods. However, limited information exists regarding the effectiveness of FNf in sugarcane. This study aimed to optimize FNf in sugarcane by evaluating N‐fertilizer recovery by the plant (NRP) and assessing potential toxicity effects. Four sugarcane genotypes were subjected to FNf using 15N‐urea at five nitrogen concentrations. NRP was assessed at five time points for roots, stalk, old leaves, 15N‐urea‐fertilized leaves (15NL), and unexpanded leaves (UEL). Leaf scorching, indicating FNf toxicity, was analyzed using morpho‐anatomical and histochemical techniques. The results showed that FNf promoted high NRP, with an average recovery of 62.3%. Surprisingly, the redistribution of 15N‐urea did not follow the nitrogen uptake rate by sugarcane leaves, with an average of 41.3% of the total‐NRP. The stalk emerged as the primary sink for 15N‐urea, followed by the UEL. Genotypes differed in the leaf scorching intensity, which increased with higher concentration of 15N‐urea. Genotypes also differed in the 15N‐urea uptake rate, down‐regulated by the N content in the 15NL. These findings emphasize that by carefully choosing the appropriate genotype and nitrogen concentration, FNf can significantly enhance N‐fertilizer uptake, resulting in potential environmental and economic benefits.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Fnf and The Importance For Sugarcane In Reducing Ghg Emissio...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Optimizing foliar N‐fertilization in sugarcane depends on plant genotype and nitrogen concentration

Quassi de Castro,

Sermarini,

Rossi

et al. 2023

Physiologia Plantarum

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Multi-experiment assessment of soil nitrous oxide emissions in sugarcane

Galdos,

Soares,

Lourenço

et al. 2023

Nutr Cycl Agroecosyst

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Soil nitrous oxide (N2O) fluxes comprise a significant part of the greenhouse gas emissions of agricultural products but are spatially and temporally variable, due to complex interactions between climate, soil and management variables. This study aimed to identify the main factors that affect N2O emissions under sugarcane, using a multi-site database from field experiments. Greenhouse gas fluxes, soil, climate, and management data were obtained from 13 field trials spanning the 2011–2017 period. We conducted exploratory, descriptive and inferential data analyses in experiments with varying fertiliser and stillage (vinasse) type and rate, and crop residue rates. The most relevant period of high N2O fluxes was the first 46 days after fertiliser application. The results indicate a strong positive correlation of cumulative N2O with nitrogen (N) fertiliser rate, soil fungi community (18S rRNA gene), soil ammonium (NH4+) and nitrate (NO3−); and a moderate negative correlation with amoA genes of ammonia-oxidising archaea (AOA) and soil organic matter content. The regression analysis revealed that easily routinely measured climate and management-related variables explained over 50% of the variation in cumulative N2O emissions, and that additional soil chemical and physical parameters improved the regression fit with an R2 = 0.65. Cross-wavelet analysis indicated significant correlations of N2O fluxes with rainfall and air temperature up to 64 days, associated with temporal lags of 2 to 4 days in some experiments, and presenting a good environmental control over fluxes in general. The nitrogen fertiliser mean emission factors ranged from 0.03 to 1.17% of N applied, with urea and ammonium nitrate plus vinasse producing high emissions, while ammonium sulphate, ammonium nitrate without vinasse, calcium nitrate, and mitigation alternatives (nitrification inhibitors and timing of vinasse application) producing low N2O-EFs. Measurements from multiple sites spanning several cropping seasons were useful for exploring the influence of environmental and management-related variables on soil N2O emissions in sugarcane production, providing support for global warming mitigation strategies, nitrogen management policies, and increased agricultural input efficiency.

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The nitrogen fertilizer conundrum: why is yield a poor determinant of crops’ nitrogen fertilizer requirements?

Thorburn,

Biggs,

Puntel

et al. 2024

Agron. Sustain. Dev.

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The application of nitrogen (N) fertilizer both underpins high productivity of agricultural systems and contributes to multiple environmental harms. The search for ways that farmers can optimize the N fertilizer applications to their crops is of global significance. A common concept in developing recommendations for N fertilizer applications is the “mass balance paradigm” – that is, bigger crops need more N, and smaller less – despite several studies showing that the crop yield at the optimum N rate (Nopt) is poorly related to Nopt. In this study we simulated two contrasting field experiments where crops were grown for 5 and 16 consecutive years under uniform management, but in which yield at Nopt was poorly correlated to Nopt. We found that N lost to the environment relative to yields (i.e., kg N t-1) varied +/- 124 and 164 % of the mean in the simulations of the experiments. Conversely, N exported in harvested produce (kg N t-1) was +/- 11 and 48 % of the mean. Given the experiments were uniformly managed across time, the variations result from crop-to-crop climatic differences. These results provide, for the first time, a quantitative example of the importance of climatic causes of the poor correlation between yield at Nopt and Nopt. An implication of this result is that, even if yield of the coming crop could be accurately predicted it would be of little use in determining the amount of N fertilizer farmers need to apply because of the variability in environmental N losses and/or crop N uptake. These results, in addition to previous empirical evidence that yield at Nopt and Nopt are poorly correlated, may help industry and farmers move to more credible systems of N fertilizer management.

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A novel approach for determining nitrogen requirement based on a new agronomic principle—sugarcane as a crop model

Cited by 9 publications

References 48 publications

Optimizing foliar N‐fertilization in sugarcane depends on plant genotype and nitrogen concentration

Optimizing foliar N‐fertilization in sugarcane depends on plant genotype and nitrogen concentration

Multi-experiment assessment of soil nitrous oxide emissions in sugarcane

The nitrogen fertilizer conundrum: why is yield a poor determinant of crops’ nitrogen fertilizer requirements?

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