Uusitalo, Risto; Turtola, Eila; Grönroos, Juha; Kivistö, Juhani; Mäntylahti, Väinö; Turtola, Ari; Lemola, Riitta and Salo, Tapio (2007) Finnish trends in phosphorus balances and soil test phosphorus. Agricultural and Food Science, 16 (4), pp. 301-316.
- Published Version
Soil test phosphorus (P) concentration has a major influence on the dissolved P concentration in runoff from agricultural soils. Thus, trends in soil test P partly determine the development of pollution potential of agricultural activities. We reviewed the changes of soil test P and P balances in Finnish agriculture, and assessed the current setting of P loss potential after two Agri-Environmental Programs. Phosphorus balance of the Finnish agriculture has decreased from +35 kg ha–1 of the 1980’s to about +8 kg P ha–1 today. As a consequence, the 50-yr upward trend in soil test P concentrations has probably levelled out in the late 1990’s, as suggested by sampling of about 1600 fields and by a modelling exercise. For the majority of our agricultural soils, soil test P concentrations are currently at a level at which annual P fertilization is unlikely to give measurable yield responses. Soils that benefit from annual P applications are more often found in farms specialized in cereal production, whereas farms specialized in non-cereal plant production and animal production have higher soil test P concentrations. An imbalance in P cycling between plant (feed) and animal production is obvious, and regional imbalances are a result of concentration of animal farms in some parts of the country. A major concern in future will be the fate of manure P in those regions where animal production intensity is further increasing.
|EPrint Type:||Journal paper|
|Keywords:||phosphorus, P balance, soil test P, farm type, P fertilization,, Agri-Environmental Programs|
|Subjects:||Soil > Nutrient turnover|
|Deposited By:||Koistinen, Riitta|
|Deposited On:||06 May 2010 10:19|
|Last Modified:||06 May 2010 10:19|
|Refereed:||Peer-reviewed and accepted|
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