[Text] = Apatite and phlogopite as phosphorus and potassium fertilizers in peatland pine forests : научное издание / S. Kaunisto, M. Moilanen, J. Issakainen. - Helsinki : Metsantutkimuslaitos, 1993. - 30 с. : рис., табл. - (Folia Forestalia ; № 810). - fin. - Библиогр.: с. 20. -
ISSN 0015-5543. -
ISBN 951-40-1309-3 : 800.00 р.
Аннотация: Tree nutrition and growth were studied while using apatite and rock phosphate as phosphorus, and phlogopite and potassium chloride as potassium sources for pine on peatlands. Different fertilizer materials were compared in the following combinations: rock phosphate+potassium chloride, apatite+phlogopite and rock phosphate+phlogopite. The study involved nine different experiments totalling 116 plots. Most of the sites were deficient in phosphorus and potassium.
Peat nitrogen content ranged from low (0.9 %) to fairly high (2.6 %) concentrations. Apatite was a satisfactory phosphorus source for trees, but the effects on both needle phosphorus concentrations and tree growth were slower than with rock phosphate. The dealy of growth was 3-8 years. Phlogopite increased the
peat total potassium contents slightly more than potassium chloride. Phlogopite raised needle potassium concentrations during the first 2-6 years after fertilization less than potassium chloride.
Доп.точки доступа: Moilanen, M.; Issakainen, J.
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