Nitrogen, phosphorus and potassium balances in ecological farms of differential areas
2007
Barszczewski, J. | Jankowska-Huflejt, H. | Wolicka, M.,Instytut Melioracji i Uzytkow Zielonych, Falenty (Poland)
Selected ecological grassland farms located in seven Polish provinces were inquired to make possible to evaluate the nitrogen, phosphorus and potassium management through balances of these nutrients. Balances in particular area groups were clearly varied. The most profitable nitrogen and phosphorus balances with considerable equal potassium balances were noticed in 10.1-20.0 ha area group both in 2005 and 2006. Farms in this group had high livestock density, about 0.8 LU/ha, lower share of grasslands in croplands and high diversity of arable farming. The highest balances of potassium (the highest surpluses) were noticed in 2006 in 1.0-10.0 ha area group with the highest livestock density. The farms of 20.1-50.0 ha and greater 50 ha area groups had lower livestock density, with greater cereals share in cropping system and the most unprofitable nitrogen, phosphorus and potassium balances, especially in 2005
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