Background: A combination of field experiment and modelling tested the hypothesis that dry summers increase the risk of nitrogen (N) leaching from pasture owing to a combination of: soil N accumulation in a dry summer; slow recovery of drought-affected pasture in the autumn; and the resultant inefficient use of fertiliser N by the pasture.
Results: In the experiment, pasture response to urea and apparent N recovery in autumn after the drought was half that of irrigated pasture (7 vs 13 kg dry matter kg N; 28 vs 52% apparent recovery; P < 0.05). There was more soil mineral N at the start of drainage (P < 0.001) as a result of this inefficient fertiliser N use. Modelling of pasture growth in six different drought years demonstrated that subsequent N leaching risk after rewetting was inversely related to pasture N uptake during rewetting in the autumn.
Conclusion: When the period between post-drought pasture recovery and the onset of drainage is short, N leaching risk increases. Nitrogen leaching is determined by the type of autumn (slow or fast growing conditions before drainage) and the amount of fertiliser N applied. The latter can be managed by a farmer, but the former cannot. © 2018 Society of Chemical Industry.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1002/jsfa.8893 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Riparian Soil Heavy Metal Contamination and Pollution Assessment and Management Planning Integrating Multiple Indices, Statistical and Geospatial Approaches.
Environ Manage
January 2025
Department of Engineering, Reykjavik University, Reykjavík, Iceland.
This research assesses heavy metal contamination within the riparian zone of the Danro River, a tributary of the Ganges River basin in India, particularly impacted by sand mining activities. The study conducted analyses on major and trace elements in soil samples, focusing on those identified as ecologically hazardous by the Water Framework Directive of India. Utilizing a combination of indices (Enrichment Factor, Pollution Load Index, and Index of geo-accumulation) and statistical techniques such as Principal Component Analysis (PCA), the investigation aimed to evaluate contamination severity, ecological risks, and pollution sources.
View Article and Find Full Text PDFCoffee is a popular beverage with significant commercial and social importance. The study aimed to determine the fatty acids profile, volatile compounds, and concentration of major and trace elements (Na, Mg, K, Ca, P, S, Fe, Mn, Cu, Zn, Cr, Ni, Cd, and Pb) in the two most important varieties of coffee, namely arabica and robusta. The leaching percentages of mineral elements and the effect of boiling time on the transfer of elements to aqueous extracts were also determined.
View Article and Find Full Text PDFAntimicrobial agents in agricultural fertilizers produced from sewage sludge - A cause for concern?
Sci Total Environ
January 2025
University of Bath, Department of Chemistry, Bath BA2 7AY, United Kingdom; Centre of Excellence in Water-Based Early Warning Systems for Health Protection, University of Bath, Bath BA25RX, United Kingdom.
The production of organic-mineral fertilizers from sewage sludge is one of the ecological options in their management. Though, pharmaceuticals and their derivatives, which accumulate in the sludge, could be a problem due to their impacts on the environment. This manuscript aimed at better understanding of risks posed by antimicrobial agents (AAs) in sludge-based fertilizers.
View Article and Find Full Text PDFCovalent Grafting of Quaternary Ammonium Salt-Containing Polyurethane onto Silicone Substrates to Enhance Bacterial Contact-Killing Ability.
Polymers (Basel)
December 2024
School of Chemistry and Chemical Engineering, Tianjin University of Technology, 391 Binshuixidao, Tianjin 300384, China.
Catheter-associated urinary tract infection (CAUTI) induced by rapid bacterial colonization and biofilm formation on urinary catheters is a key issue that urgently needs to be addressed. To prevent CAUTI, many contact-killing, non-leaching coatings have been developed for the surfaces of silicone catheters. However, due to the chemical inertness of the silicone substrate, most current coatings lack adhesion and are unstable under external forces.
View Article and Find Full Text PDFLeaching Characteristics and Mechanisms of Fluorine and Phosphorus from Phosphogypsum.
Molecules
December 2024
School of Resources and Safety Engineering, Wuhan Institute of Technology, Wuhan 430205, China.
As a large-volume industrial solid waste generated during the production of wet-process phosphoric acid, the primary disposal method for phosphogypsum (PG) currently involves centralized stockpiling, which requires substantial land use. Additionally, PG contains impurities, such as phosphorus, fluorine, and alkali metals, that may pose potential pollution risks to the surrounding environment. However, the mechanisms governing the co-release of phosphorus and fluorine impurities alongside valuable metal cations during leaching remain unclear, posing challenges to efficient disposal and utilization.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!