Soil nutrient dynamics and biomass production in an organic and inorganic fertilized short rotation willow coppice system

摘要

Changes in soil nutrients and biomass production of two willow clones (Salix miyabeana - SX64 and S. purpurea -9882-34) in a 150 and 200 kg available N ha"1 of urea commercial fertilizer (CF), biosolid compost (BC) and digested dairy manure (DM) and acontrol (CTO) were compared at Middlebury, VT (MID), Delhi, NY (DEL) and Fredonia, NY (FRE). There was no significant difference in biomass production among the fertilization treatments. First rotation biomass production of SX64 ranged from 13.2-19.0 Mgha~(-1) yr~(-1) at DEL, 9.0-15.0 Mg ha~(-1) yr~(-1) at MID and 5.5-9.3 Mg ha~(-1) yr~(-1) at FRE. For 9882-34, biomass production ranged from 9.0-11.6 Mg ha~(-1) yr~(-1) at DEL, 3.4-8.8 Mg ha~(-1) yr~(-1) at MID and 3.5-7.7 Mg ha~(-1) yr~(-1) at FRE. This indicates that willow biomass can be produced without fertilizer additions. Application of BC significantly increased soil N, P, Mg and OM levels at the MID site. At the DEL site, BC and DM treatments increased soil N, P, Ca, Mg and OM levels. The fertilization treatments had no significant effect on any soil nutrients at the FRE site.