Abstract
Red clover material labelled with15N was confined in mesh bags and buried into microplots in October at two field sites in Sourthern Finland. The soils (Kettula silt loam and Långvik loam) contained in the microplots were previously limed and fertilized with PK (N was given in next May) in different combinations. The following May the microplots were sown with barley and after the barley had been harvested (that August) soil samples and the mesh bags were removed. The crop, mesh bags and soil were then analysed for15N content.
The soil treatments did not affect the release of clover N from the mesh bags and only slightly its retention in Kettula silt loam. The dry mass of barley obtained responded strongly to the different soil treatments. In comparison, the uptake of clover N by the barley varied much less; in Kettula silt loam a 1.6 fold increase in barley dry mass did not affect its content of clover N (12–13% of input) and in Långvik loam a ten fold increase in barley dry mass yield corresponded to a three fold increase of the content of clover N (5–16%). The total recovery of clover N (clover N in soil+mesh bags+barley harvest) was almost independent of the soil treatment; in Kettula silt loam and Långvik loam being respectively 52–56% and 71–85% of the input.
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Müller, M.M. The fate of clover-derived nitrogen (15N) during decomposition under field conditions: Effects of liming and fertilization. Plant Soil 111, 121–126 (1988). https://doi.org/10.1007/BF02182045
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DOI: https://doi.org/10.1007/BF02182045