“Preferential” ammonium uptake by sugarcane does not increase the 15N recovery of fertilizer sources

“…Among the FM treatments, FM1 contained a higher amount of NH 4 + which is the most needed N form for sugarcane growth. Unlike most other crops, evidence has shown that sugarcane has a preferential uptake of ammonium than other forms of N ( Boschiero, Mariano & Trivelin, 2018 ). Although NH 4 concentration was similar in the CK, FM2, and FM3, the lower TN in CK suggests that higher mineralization of the soil’s native N May have occurred, which may result in inorganic N losses if a lower uptake accompanied by leaching losses occurs.…”

Section: Discussionmentioning

confidence: 99%

Filtered mud improves sugarcane growth and modifies the functional abundance and structure of soil microbial populations

Abubakar

Ibrahim

Zhang

et al. 2022

PeerJ

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Background Exploring high-quality organic amendments has been a focus of sustainable agriculture. Filtered mud (FM), a sugar factory waste derived from sugarcane stems, could be an alternative organic amendment for sugarcane production. However, the effects of its application proportions on soil fertility, nutrient cycling, structure of soil bacterial and fungal communities, and the growth of sugarcane in clay-loam soils remain unexplored. Methods Three application proportions of FM: (FM1-(FM: Soil at 1:4), FM2-(FM: Soil at 2:3), and FM3-(FM: Soil at 3:2)) were evaluated on sugarcane growth and soil nutrient cycling. High throughput sequencing was also employed to explore soil microbial dynamics. Results We observed that FM generally increased the soil’s nutritional properties while improving NO3− retention compared to the control, resulting in increased growth parameters of sugarcane. Specifically, FM1 increased the concentration of NH4+−N, the N fraction preferably taken up by sugarcane, which was associated with an increase in the plant height, and more improved growth properties, among other treatments. An increase in the proportion of FM also increased the activity of soil nutrient cycling enzymes; urease, phosphatase, and β-glucosidase. High throughput sequencing revealed that FM reduced the diversity of soil bacteria while having insignificant effects on fungal diversity. Although increasing FM rates reduced the relative abundance of the phyla Proteobacteria, its class members, the Gammaproteobacteria and Betaproteobacteria containing some N-cycling related genera, were stimulated. Also, FM stimulated the abundance of beneficial and lignocellulose degrading organisms. These included the bacterial phyla Actinobacteria, Bacteroidetes, Acidobacteria, Chloroflexi, and the fungal phylum Ascomycota. The distribution of the soil microbial community under FM rates was regulated by the changes in soil pH and the availability of soil nutrients. Since FM1 showed more promise in improving the growth properties of sugarcane, it could be more economical and sustainable for sugarcane production in clay-loam soils.

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“…The use of 15 N labelled fertiliser can trace the fate of fertiliser N in crop and soil and provides information regarding the amount of fertiliser N lost to the environment as the balance between recovered and applied 15 N fertiliser (Dourado-Neto et al 2010). Fertiliser 15 N uptake in sugarcane commonly accounts for only 20-40% of the N applied (Boschiero et al 2018;Chapman et al 1994;da Silva et al 2020;Franco et al 2011;Prasertsak et al 2002;Takeda et al 2021b;Vallis et al 1996), which is lower than values typically reported from other eld crops such as maize (65%), wheat (57%), and rice (46%) (Ladha et al 2005). Subtracting the recovered fertiliser N from the total N in the respective pool enables evaluation of soil N contribution to this N pool.…”

Section: Introductionmentioning

confidence: 98%

Interaction Between Soil and Fertiliser Nitrogen (N) Drives Plant N Uptake and Nitrous Oxide (N2O) Emissions in Tropical Sugarcane Systems

Takeda

Friedl

Kirkby

et al. 2022

Preprint

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Aims: High nitrogen (N) fertiliser inputs in intensive sugarcane systems drive productivity but also significant emissions of nitrous oxide (N2O), a potent greenhouse gas. The effects of N fertiliser inputs on native soil N availability for plant N uptake as well as N2O emissions remain unknown, hindering efficient N management. This study investigated the contribution of fertiliser and soil N and their interaction to plant N uptake and N2O emissions in two intensively managed tropical sugarcane systems with different farming practices. Methods: High temporal resolution N2O measurements were combined with 15N recoveries across four N fertiliser rates, (100, 150, 200 and 250 kg N ha-1) in soil, plant and N2O emissions. Results: Cumulative N2O emissions ranged from 0.3 to 4.1 kg N ha-1, corresponding to emission factors ranging from 0.7 to 2.4%. Native soil N accounted for > 60% of cumulative N2O emissions and total plant N uptake. Fertiliser N addition increased N2O emissions from native soil N compared to the unfertilised control. These findings highlight the interaction between fertiliser and soil N, with the latter being the dominant source for N uptake and loss. Overall fertiliser 15N loss responded exponentially to N rates with 50% of applied N fertiliser permanently lost even at the recommended N rate. Conclusions: The response of soil-derived N2O emissions to N rates largely determined the magnitude of total N2O emissions, demonstrating the importance of site and soil specific interaction between soil and fertiliser N for N2O emissions.

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“Preferential” ammonium uptake by sugarcane does not increase the 15N recovery of fertilizer sources

Cited by 32 publications

References 57 publications

Photosynthesis and biomass accumulation in young sugarcane plants grown under increasing ammonium supply in nutrient solution

Photosynthesis and biomass accumulation in young sugarcane plants grown under increasing ammonium supply in nutrient solution

Filtered mud improves sugarcane growth and modifies the functional abundance and structure of soil microbial populations

Interaction Between Soil and Fertiliser Nitrogen (N) Drives Plant N Uptake and Nitrous Oxide (N2O) Emissions in Tropical Sugarcane Systems

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