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| Turtola, Eila; Lemola, Riitta; Esala, Martti; Kiljala, Janne; Joki-Tokola, Erkki. |
| P and N losses were highest from the conventional crop rotation. The losses were most affected by single management practices. The four-year study is, however, too short for soil derived, long-term differences to come fully out in the leaching losses. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Air and water emissions. |
| Ano: 2003 |
URL: http://orgprints.org/11171/1/njfb.pdf |
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| Uusitalo, Risto; Turtola, Eila; Grönroos, Juha; Kivistö, Juhani; Mäntylahti, Väinö; Turtola, Ari; Lemola, Riitta; Salo, Tapio. |
| 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,... |
| Tipo: Journal paper |
Palavras-chave: Nutrient turnover. |
| Ano: 2007 |
URL: http://orgprints.org/17083/1/uusitalo.pdf |
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| Salo, Tapio; Lemola, Riitta; Esala, Martti. |
| Nitrogen (N) balance has been identified as a principal agri-environmental indicator. In addition to national N balances, calculation of N balances for different agricultural regions is also recommended. In this study, national and regional net N balances for Finland were calculated. The net N balance is the result of deducting the NH3-N losses from manure and fertilisers from the gross N balance. The N balance calculation was based on data for Finnish Rural Centres and calculated per cultivated hectare. The main data inputs for the calculations were agricultural and environmental statistics, coefficients of manure excretion and crop N concentrations. Finnish national net N balance decreased from 90 kg ha–1 in 1990 to 50 kg ha–1 in 2005. The decrease in... |
| Tipo: Journal paper |
Palavras-chave: Nutrient turnover. |
| Ano: 2007 |
URL: http://orgprints.org/16896/1/salo.pdf |
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