Løes, Anne-Kristin and Øgaard, Anne Falk (1997) Changes in the nutrient content of agricultural soil on conversion to organic farming, in relation to farm level nutrient balances and soil contents of clay and organic matter. Acta Agric. Scand., Sect. B, Soil and Plant Sci., 47, pp. 201-214.
Agricultural soil on 12 farms converting to organic farming was sampled in 1989 and 1995 at the same sample points. Concentrations of plant-available (-AL) P, K, Ca and Mg, HNO3-soluble K, tot- N, tot-C and pH were measured in two layers. The average K-AL concentration and pH were reduced in both layers. The average P-AL concentration was reduced in the topsoil. K-AL and P-AL increased in samples with low concentrations and decreased in samples with high and very high concentrations in 1989. The total N concentration increased in the subsoil. Tot-N and tot-C increased in top- and subsoil with a low organic matter content. The net import of P, calculated by farm level nutrient balances, was negatively correlated to the change in kg P-AL per hectare in the topsoil. No such correlation was found for K.
|EPrint Type:||Journal paper|
|Keywords:||potassium, phosphorus, nitrogen, magnesium, soil pH, whole farm case study, Norway|
|Subjects:|| Soil > Nutrient turnover|
Farming Systems > Farm nutrient management
|Research affiliation:|| Norway > NORSØK - Norwegian Centre for Ecological Agriculture|
Norway > UMB - Norwegian University of Life Sciences
|Deposited By:||Løes, Anne-Kristin|
|Deposited On:||31 Jul 2006|
|Last Modified:||12 Apr 2010 07:31|
|Refereed:||Peer-reviewed and accepted|
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