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Report, 2014

Gödsling runt poppelstubbar med stubbskott

Johansson, Tord; Hjelm, Birger

Abstract

In 2012 three experiments on fertilization of poplar stumps was established on former farmland in southern Sweden where trial no. 1 was located at lat. 58° 08’ N., long. 12° 40’ E. and trial nos. 2 and 3 at lat. 55° 29’ N., long. 13° 39’ E. The poplar stands were 20-year-old when they were harvested in 2011. The number stems per hectare was 1250, 707 and 707 with a mean diameter at breastheight (DBH) of 24.6±0.4, 25.1±0.3 and 25.1±0.3 respectively. The diameter at 0.1 m height above stump for the sprouts was 7.5 mm in trial no.1 and 11.1 and 13.2 mm respectively for trial nos. 2 and 3. Around the stumps with a radius of 5 m the ground was fertilized in autumn 2012 with 75 and 150 kg N per hectare. Totally 30 stumps were included in each trial: 10 as a control, 10 fertilized with 75 and 150 N ha-1 each. Next year in spring 5 stumps of the fertilized stumps with 75 and 150 kg ha-1 were fertilized again with 75 and 150 kg N ha-1. The trials have been revised 2012, 2013 and 2014. The number of sprouts stump-1 three years after treatment (2014) ranged between 9 and 17 for trial no. 1. For trial nos. 2 and 3 the number ranged between 9 and 14 and 12 and 15 respectively. Fertilized stumps produced taller sprouts with higher DBH than unfertilized. Mean diameter at breastheight (DBH) was 20.7 mm for trial no. 1 and 29.9 and 33.4 mm respectively for trial nos. 2 and 3. Sprouts in trial no. 1 were shorter than in the other two trials. In trial no. 1 sprouts with repeated fertilizing 150 kg N ha-1 were tallest, 415 cm, compared with unfertilized, 335 cm. In trial nos. 2 and 3 sprouts with repeated fertilizing (150 kg N ha-1) were tallest, 592 and 584 cm compared with 516 and 548 cm for unfertilized.

Keywords

Biomass, diameter, farm land, fertilization, height, poplar stump, sprout

Published in

Rapport (Institutionen för energi och teknik, SLU)
2014, number: 078
Publisher: Institutionen för energi och teknik, Sveriges lantbruksuniversitet

Authors' information

Johansson, Tord
Swedish University of Agricultural Sciences, Department of Energy and Technology
Hjelm, Birger
Swedish University of Agricultural Sciences, Department of Crop Production Ecology

UKÄ Subject classification

Forest Science

URI (permanent link to this page)

https://res.slu.se/id/publ/63334