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Středová, Hana; Fukalová, Petra; Chuchma, Filip; Haberle, Jan; Středa, Tomáš
The Science of the total environment, 03/2024, Volume: 917Journal Article
The positive effect of nitrogen fertilization in agriculture inevitably increases residual nitrogen losses. Water pollution led to legal restrictions of some farm practices within the framework of the Nitrates Directive of the EU. Nevertheless, even several decades later, the situation has not improved significantly. We present a possible science-based explanation of such a state and provide it to farmers and government as a support for environmental management settings. This study aimed to compare an established approach to implementing the Nitrates Directive, specifically the climate-based zoning of nitrogen fertilization restrictions using data from the mid-20th century. We evaluated this approach by juxtaposing the initial climate data with more recent data spanning from 1991 to 2020. Subsequently, we examined this zoning framework from the perspective of the non-vegetative period, characterized by temperatures below 5 °C, which is widely acknowledged as a critical threshold for nitrogen intake by plants. We found out that i) the employed climate-born zoning does not correspond to recent climate data; ii) nonvegetation period is longer than nitrogen fertilization restrictions. Therefore, despite a noteworthy 22 day reduction in the nonvegetation period from 1961/1962 to 2019/2020, we cast doubt on the notion that the period limiting nitrogen fertilizer application should also be shortened, while admitting that there are other abiotic and biotic factors affecting nitrogen behaviour within the ecosystem. Display omitted •Nitrogen management in the Czechia affects water quality of 11 states.•Continuous unsatisfactory water quality calls for Nitrates Directive scrutiny.•We bring climatologically based contribution to the discussion on nitrogen management.•Vegetation period in Central Europe has prolonged about 20 days over last 6 decades.•Nitrogen application bans and nonvegetation period differ about tens of days.
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