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Research article - Peer-reviewed, 2021

Nutrient Load Mitigation with Wintertime Cover as Estimated by the INCA Model

Rankinen, Katri; Turtola, Eila; Lemola, Riitta; Futter, Martyn; Cano Bernal, Jose Enrique;

Abstract

Increased nutrient loading causes deterioration of receiving surface waters in areas of intensive agriculture. While nitrate and particulate phosphorus load can be efficiently controlled by reducing tillage frequency and increasing vegetation cover, many field studies have shown simultaneously increased loading of bioavailable phosphorus. In the latest phase of the Rural Programme of EU agri-environmental measures, the highest potential to reduce the nutrient loading to receiving waters were the maximum limits for fertilization of arable crops and retaining plant cover on fields with, e.g., no-till methods and uncultivated nature management fields. Due to the latter two measures, the area of vegetation cover has increased since 1995, suggesting clear effects on nutrient loading in the catchment scale as well. We modeled the effectiveness of agri-environmental measures to reduce phosphorus and nitrogen loads to waters and additionally tested the performance of the dynamic, process-based INCA-P (Integrated Nutrients in Catchments-Phosphorus) model to simulate P dynamics in an agricultural catchment. We concluded that INCA-P was able to simulate both fast (immediate) and slow (non-immediate) processes that influence P loading from catchments. Based on our model simulations, it was also evident that no-till methods had increased bioavailable P load to receiving waters, even though total P and total N loading were reduced.

Keywords

mathematical modeling; agricultural policy; wintertime vegetation cover; dissolved reactive phosphorus

Published in

Water

2021, volume: 13, number: 4, article number: 450
Publisher: MDPI

Authors' information

Rankinen, Katri
Finnish Environment Institute
Turtola, Eila
Natural Resources Institute Finland (Luke)
Lemola, Riitta
Natural Resources Institute Finland (Luke)
Swedish University of Agricultural Sciences, Department of Aquatic Sciences and Assessment
Cano Bernal, Jose Enrique
Finnish Environment Institute

UKÄ Subject classification

Environmental Sciences related to Agriculture and Land-use
Oceanography, Hydrology, Water Resources

Publication Identifiers

DOI: https://doi.org/10.3390/w13040450

URI (permanent link to this page)

https://res.slu.se/id/publ/111284