Nutrient budgets – objectives and consequences [nutrient balance (plants), nitrogen, phosphorus, agriculture, environmental impact, Latvia] | Augu barības elementu bilance – mērķis un nozīme
2019
Karklins, A., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia). Faculty of Agriculture
The Gross Nutrient Budget (GNB) is a key indicator of relevance for number of agri-environment related policies. It is intended to be a respective indicator of potential threat of surplus or deficit of two major soil and plant nutrients – nitrogen and phosphorus – within the agricultural system. GNB shows the link between agricultural activities and the environmental impact. For annual routine GNB calculation number of input data are required (NP excretion by animals, input by mineral fertilisers, biological N fixation, atmospheric N deposition, seed and planting material, outputs by crop and fodder production, residues removed from the field etc.). These reference values should be unified on the national scale as it is also used to perform other transnational initiatives like HELCOM nutrient load targets, EU Nitrate directive, mitigation of greenhouse gases as well as ammonia emissions, nitrogen and phosphorous reduction in environment etc. It is also used for the fertiliser planning on the farm-scale level. Unification of nutrient budget input values used in Latvia is the main goal of the Project.
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