Seppo Kaunisto , Tytti Sarjala

Kuusen neulasanalyyttinen kaliumravitsemuksen arviointi eri vuodenaikoina

Kaunisto S., Sarjala T. Kuusen neulasanalyyttinen kaliumravitsemuksen arviointi eri vuodenaikoina.

Tiivistelmä

The aims of this study were 1) to get a better background for estimating limit values of potassium nutrition for Norway spruce (Picea abies L. Karst.) and 2) to find out if the needle potassium nutrition during dormancy could be estimated by analysing needles collected before the dormant period. Five groups of trees with different nutritional backgrounds were selected. One was on a shallow-peat (5–30 cm) mineral soil slope and four on a deep-peat site next to it. Needles were collected four times during the autumn months and twice during dormancy. The needle K concentration of a severe potassium deficiency limit indicated by the exponential accumulation of putrescine, was about 4.5 mg g–1. However, trees suffered from potassium shortage already at the potassium concentrations of about 5 mg g–1. The needle potassium concentrations during the autumn months from late August to early October were in very close correlation with the concentration during dormancy, y = 0.869x – 0.208 (r2 = 0.92), where y is the potassium concentration in the winter months and x that during the autumn months.

Avainsanat
potassium; peatland; mire; Deficiency; deficiency limit; putrescine

Vastaanotettu 31.10.2017 Julkaistu 1.1.2002

Katselukerrat 3208

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