Sammanfattning

The fertiliser effect of adding wood ash or crushed rock to a low-fertility soil, compared with an unamended control, was assessed in a pot experiment with a perennial ryegrass-red clover mixture. Dinitrogen (N-2) fixation by the clover and translocation of fixed N to the grass were determined using N-15 natural abundance. The wood ash produced the highest accumulated clover biomass over two cuts, followed by the crushed rock. Chemical analyses suggested that the increase was due to K supply by the amendments. The wood ash also led to larger amounts of fixed N compared with the control. However, N-2 fixation was not increased as much as biomass amount, leading to dilution of plant N. There were minor or no treatment effects on mineralisation from soil N pools. This indicates that good-quality wood ash can be successfully used as a multi-element soil amendment to enhance clover growth on low-fertility soils.

Nyckelord

circular economy; nitrogen translocation; recycling products; soil amendment

Publicerad i

Agricultural and Food Science
2017, Volym: 26, nummer: 4, sidor: 188-197
Utgivare: SCIENTIFIC AGRICULTURAL SOC FINLAND

SLU författare

• Dahlin, Sigrun

  • Institutionen för mark och miljö, Sveriges lantbruksuniversitet
    

• Stenberg, Maria

  • Institutionen för mark och miljö, Sveriges lantbruksuniversitet
    

UKÄ forskningsämne

Jordbruksvetenskap


Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/93449