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Case Study of Effects of Mineral N Fertilization Amounts on Water Productivity in Rainfed Winter Rapeseed Cultivation on a Sandy Soil in Brandenburg (Germany) over Three Years

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Leibniz Institute for Agricultural Engineering and Bioeconomy (ATB), Max-Eyth-Allee 100, 14469 Potsdam, Germany
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Faculty of Life Sciences, Humboldt-University of Berlin, Hinter der Reinhardtstr. 8-18, 10115 Berlin, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Teresa Afonso do Paço
Water 2021, 13(14), 1958; https://doi.org/10.3390/w13141958
Received: 23 April 2021 / Revised: 21 June 2021 / Accepted: 1 July 2021 / Published: 16 July 2021
Detailed knowledge about farm management practices and related hydrological processes on water productivity is required to substantially increase the productivity of precipitation water use in agriculture. With this in mind, the effect of the nitrogen (N) fertilization level on water productivity of winter oilseed rape (Brassica napus L.) was analyzed using a modeling approach and field measurements. In this first study of interception loss and water productivity in winter oilseed rape, the crop was cultivated in a field experiment on a sandy soil in Brandenburg (Germany) under five nitrogen fertilization treatments with 0, 60, 120, 180, and 240 kg mineral N ha−1 a−1. Based on data from three vegetation periods the water flows and the mass-based water productivity of seeds were calculated on a daily basis with the AgroHyd Farmmodel modeling software. As recommended from the recently developed guidelines of the FAO on water use in agriculture, the method water productivity was applied and uncertainties associated with the calculations were assessed. Economic profit-based water productivity (WPprofit) was calculated considering the costs of fertilization and the optimal level of N fertilization, which was determined based on a quadratic crop yield response function. Mean water productivity of seeds varied from 1.16 kg m−3 for the unfertilized control sample to 2.00 kg m−3 under the highest fertilization rate. N fertilization had a clearly positive effect on WPprofit. However, fertilizer application rates above 120 kg N ha−1 a−1 led to only marginal increases in yields. Water productivity of seeds under the highest fertilization rate was only insignificantly higher than under medium application rates. The optimum N level for the maximal WPprofit identified here was higher with 216 kg N ha−1 a−1. The conclusion is that further research is needed to investigate the interaction between fertilization and other farm management practices. View Full-Text
Keywords: winter oilseed rape; water use; nitrogen; water-storage capacity; AgroHyd Farmmodel winter oilseed rape; water use; nitrogen; water-storage capacity; AgroHyd Farmmodel
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MDPI and ACS Style

Drastig, K.; Kreidenweis, U.; Meyer-Aurich, A.; Ammon, C.; Prochnow, A. Case Study of Effects of Mineral N Fertilization Amounts on Water Productivity in Rainfed Winter Rapeseed Cultivation on a Sandy Soil in Brandenburg (Germany) over Three Years. Water 2021, 13, 1958. https://doi.org/10.3390/w13141958

AMA Style

Drastig K, Kreidenweis U, Meyer-Aurich A, Ammon C, Prochnow A. Case Study of Effects of Mineral N Fertilization Amounts on Water Productivity in Rainfed Winter Rapeseed Cultivation on a Sandy Soil in Brandenburg (Germany) over Three Years. Water. 2021; 13(14):1958. https://doi.org/10.3390/w13141958

Chicago/Turabian Style

Drastig, Katrin, Ulrich Kreidenweis, Andreas Meyer-Aurich, Christian Ammon, and Annette Prochnow. 2021. "Case Study of Effects of Mineral N Fertilization Amounts on Water Productivity in Rainfed Winter Rapeseed Cultivation on a Sandy Soil in Brandenburg (Germany) over Three Years" Water 13, no. 14: 1958. https://doi.org/10.3390/w13141958

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