BALANCE SHEET OF NUTRIENTS

NOTES ON METHODOLOGY

Source and methods of data collection

Data present nitrogen and phosphorus inputs and outputs on utilised agricultural area, nitrogen and phosphorus gross surplus, nitrogen emissions into the air and nitrogen net surplus.

Data on fertilisers, number of livestock, production and harvested area are the result of statistical surveys in the field of crop and livestock production:

-  Annual Survey on Crop and Animal Production (PO-71 form)

-  Survey on Yields of Citrus Fruits and Olives (PO-34 form) and administrative data sources (those of the Ministry of Agriculture, Forestry and Fisheries, the Farm Register of the Paying Agency for Agriculture, Fisheries and Rural Development, and others).

Data on nitrogen emissions in the air have been taken over from the Ministry of Economy and Sustainable Development.

In cooperation with the Faculty of Agriculture in Zagreb, according to calculated coefficients, expert estimates for the amount of nitrogen and phosphorus in seeds and planting material, nitrogen biological fixation, nitrogen atmospheric deposition, harvested crops and fodder have been made.

Definitions

Nitrogen inputs comprise nitrogen in all forms entered into the soil with seeds and planting materials, fertilisers, biological fixation, atmospheric deposition and crop residues.

Nitrogen outputs comprise nitrogen in all forms extracted from the soil in harvested crops, in harvested or grazed fodder and in crop residues removed from the field.

Gross surplus (nitrogen) is nitrogen inputs less nitrogen outputs. The surplus of nitrogen in the soil represents the negative influence of agriculture on the environment.

N emissions are the quantity of nitrogen emitted into the air as a result of agricultural activity.

Net surplus is gross surplus reduced by the N emissions into the air. It represents the remaining nitrogen in the soil and the part of nitrogen that can potentially be leached and contaminate the water.

Phosphorus inputs comprise phosphorus in all forms entered into the soil with seeds and planting materials, fertilisers and crop residues.

Phosphorus outputs comprise phosphorus in all forms extracted from the soil in harvested crops, in harvested or grazed fodder and in crop residues removed from the field.

Gross surplus (phosphorus) is phosphorus inputs less phosphorus outputs. The surplus of phosphorus in the soil presents a negative influence of agriculture on the environment.

Symbols

-    no occurrence