Klaus Silfverberg

Ravinteiden huuhtoutuminen tuhka- ja PK-lannoitetusta turpeesta

Silfverberg K. Ravinteiden huuhtoutuminen tuhka- ja PK-lannoitetusta turpeesta.

Tiivistelmä

The nutrient concentrations of the water percolating through fertilised peat cores were investigated in a greenhouse experiment. The nutrient concentrations in the peat cores were also determined before and after the experiment. The fertiliser treatments were 500 kg ha-1 of PK peatland fertiliser, 5 000 and 25 000 kg ha-1 of birch ash, and an unfertilised control. The cores were watered on three occasions after application of the fertilisers. The percolation water collected from the fertilised cores contained significantly more nutrients than the control. The total amounts of leached nutrients were equivalent to 0.01 - 20.1 % of the nutrients in the peat cores, K clearly being leached the most. The susceptibility of the nutrients to leaching followed the order K > Mg > Ca > Mn > P. The fertiliser treatments also increased the leaching of nitrate and ammonium. The amount of leached nutrients was relatively the highest from the PK treatment, but in absolute terms the highest from the largest dose of wood ash. According to the peat analyses, the concentrations of most of the nutrients had increased only in the surface layer of the peat (0 - 5 cm). In contrast, the K concentrations had increased throughout the whole profile (0 - 20 cm). The application of large amounts of ash fertiliser should be avoided in order to minimise nutrient leaching losses. Although the fertilisers used in this experiment have been or are being replaced by new types of fertiliser, the results of this study can be used to facilitate the interpretation of the results of field experiments in which these fertilisers have been used..

Avainsanat
phosphorus; potassium; peat core; percolation water; nutrient loss

Vastaanotettu 31.10.2017 Julkaistu 1.1.1998

Katselukerrat 423

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