Nutrient leaching in an Ultisol cultivated with sugarcane

Ghiberto, Pablo Javier; Libardi, Paulo Leonel

doi:10.1016/j.agwat.2014.09.027

Cited by 51 publications

(35 citation statements)

References 28 publications

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“…However, the N initially stored in litter microbes probably will be slowly released to the crop through mineralisation (Ferreira et al, 2015). Secondly, the possible inability of microbes to trap and retain NO 3 À , in the absence of available C, may result in higher N losses by leaching (Ghiberto et al, 2015).…”

Section: Discussionmentioning

confidence: 99%

Mineral nitrogen forms alter 14C-glucose mineralisation and nitrogen transformations in litter and soil from two sugarcane fields

Mariano

Jones

Hill

2016

Applied Soil Ecology

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A B S T R A C TIn Brazil, N fertilisers are applied onto the surface of the sugarcane (Saccharum spp.) litter layer, which represents a large portion of the C stored in the agroecosystem. However, little is known about the influence of mineral N on decomposition of organic C compounds and mineral N transformations in the litter-soil transition zone. This investigation determined the effect of mineral N forms (NH 4 + and NO 3 À ) on glucose mineralisation and N dynamics in litter and topsoil from two sugarcane fields located in the state of São Paulo, Brazil. Carbon mineralisation and N availability were measured using 14 C-labelled glucose, applied alone (glucose) or combined with NH 4 + [as (NH 4 ) 2 SO 4 ] (glucose + ammonium) or NO 3 À (as KNO 3 ) (glucose + nitrate) in litter and soil from the litter-soil transition zone. The 14 C immobilised after 168 h had the following trend for the litter of both sites: glucose > glucose + ammonium > glucose + nitrate, while no differences among treatments were found for the soils. Higher immobilisation (increased by 165%, on average) occurred for NH 4 + (glucose + ammonium) compared to NO 3 À (glucose + nitrate), primarily in the sugarcane litter. Carbon mineralisation in litter was N-limited, and the addition of mineral N accelerated the return of C to the atmosphere. Lower immobilisation of NO 3 À may increase N availability to plants relative to NH 4 + in the short term, but also may lead to reduced C storage and larger greenhouse gas emissions due to faster mineralisation of labile carbohydrate through the NO 3 À reduction process.2016 Elsevier B.V. All rights reserved.

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Section: Discussionmentioning

confidence: 99%

Mineral nitrogen forms alter 14C-glucose mineralisation and nitrogen transformations in litter and soil from two sugarcane fields

Mariano

Jones

Hill

2016

Applied Soil Ecology

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“…Dotted lines in panel B indicates the curve fitting to a linear model for check plot yield and yield increase data may also result in significant environmental impacts [7]. Regarding leaching losses, for example, whereas Ghiberto et al [67,68] reported limited N losses in the plant cane, N leaching in the ratoon crop cycle represented 22.5 % of the total N applied as fertilizer (100 kg N ha −1 ) [69]. Higher leaching losses are expected to occur in ratoons given the proximity between the period of fertilizer application and the rainy season.…”

Section: Improvements In Sugarcane Nitrogen Fertilization: Recent Devmentioning

confidence: 96%

Nitrogen Use Efficiency for Sugarcane-Biofuel Production: What Is Next?

Otto

Castro

Mariano³

et al. 2016

Bioenerg. Res.

116

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Land area devoted to sugarcane (Saccharum spp.) production in Brazil has increased from 2 million to 10 million ha over the past four decades. Studies have shown that, from an environmental perspective, the transformation of nitrogen (N) fertilizers into N 2 O gases can offset the advantages gained by replacing fossil fuels with biofuels. Our objectives here were to review recent developments in N management for sugarcane-biofuel production and assess estimates of N use efficiency (NUE) and N losses based on future scenarios, as well as for life-cycle assessments of bioenergy production. Approximately 60 % of N-based fertilizer applied to sugarcane fields in Brazil is recovered by plants and soils, whereas N losses to leaching and N 2 O emissions can average 5.6 and 1.84 % of the total applied N, respectively. Maintenance of trash, rotation with N-fixing legume species, and optimization of byproducts usage have potential for reducing the N requirements of sugarcane cultivation in Brazil. Moreover, the development of sugarcane genotypes with higher NUEs, along with management systems that consider soil capacity of mineralization, is required for improving the NUE of sugarcane. Strategies to maintain N as NH 4 + in sugarcane-cropped soils also have the potential to reduce N losses and enhance NUE. The development of secondgeneration biofuels is important for increasing biofuel production while simultaneously maintaining N rates and improving NUE, and sugarcane systems in Brazil show potential for sustainable biofuel production with low N rates and limited N 2 O losses. Reducing N rates in sugarcane fields is thus necessary for improving sugarcane-based biofuel production and reducing its environmental impacts.

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“…By providing a direct and accurate measure of ψ m (Brito et al, 2009), these apparatus have been used, for instance, in studies related to soil physical-hydraulic properties (Libardi et al, 2015), soil erosion (Bolte et al, 2011), and solute transportation in the soil (Ghiberto et al, 2015).…”

Section: Formato De Cápsula E Modo De Instalação Influenciando Determmentioning

confidence: 99%

Porous cup shape and installation mode influencing determinations of matric potential by tensiometers

Franco

Silva²,

Tormena

et al. 2017

Pesq. agropec. bras.

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-The objective of this work was to determine the measurement accuracy of the soil water matric potential (ψ m ) by puncture tensiometers with either rounded or pointed porous cups, installed with or without "soil mud", and to compare the performance of these tensiometers with that of tensiometers equipped with mercury manometers. The experiment was conducted in a Ultisol, in a randomized complete block design, in a factorial arrangement with five replicates. Puncture tensiometers with rounded porous cups, installed with "soil mud", present more elevated accuracy for ψ m determination in a wider measurement range, resembling tensiometers equipped with mercury manometers in drying soil.

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Nutrient leaching in an Ultisol cultivated with sugarcane

Cited by 51 publications

References 28 publications

Mineral nitrogen forms alter 14C-glucose mineralisation and nitrogen transformations in litter and soil from two sugarcane fields

Mineral nitrogen forms alter 14C-glucose mineralisation and nitrogen transformations in litter and soil from two sugarcane fields

Nitrogen Use Efficiency for Sugarcane-Biofuel Production: What Is Next?

Porous cup shape and installation mode influencing determinations of matric potential by tensiometers

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