Hopp til hovedinnholdet

Publikasjoner

NIBIOs ansatte publiserer flere hundre vitenskapelige artikler og forskningsrapporter hvert år. Her finner du referanser og lenker til publikasjoner og andre forsknings- og formidlingsaktiviteter. Samlingen oppdateres løpende med både nytt og historisk materiale. For mer informasjon om NIBIOs publikasjoner, besøk NIBIOs bibliotek.

2025

Til dokument

Sammendrag

Black soldier fly larvae (BSFL) frass, a byproduct of insect farming, can be used as a nitrogen (N) source in cereal production, although its impacts on grain protein, grain yield, and nitrate (NO3-N) leaching are not well understood. This study determined the effect of different BSFL frass and urea combinations on hard red spring (HRS) wheat grain protein, grain yield, above-ground N uptake, post-harvest soil N, and NO3-N leaching. Wheat response to three urea/BSFL frass blends (100% urea/0% frass, 67% urea/33% frass, and 33% urea/67% frass) was evaluated at two N rates (141 and 281 kg N ha-1) alongside a non-amended control in a greenhouse using a Willamette silt loam (soil NO3-N concentration of 13.6 mg kg-1). At 141 kg N ha-1, increasing frass-N from 0 to 67% of the total N in the urea-frass blends caused a linear decline in grain yield from 26 to 19 g pot-1, with grain protein only declining from 33 to 67% frass-N. At 281 kg N ha-1, yield, protein, and plant N uptake declined when frass-N increased from 33 to 67%. Replacing 33% urea-N with frass-N at 281 kg N ha-1 decreased soil NO3-N by 86%. A leaching component showed NO3-N leaching was 17x higher for 100% urea than the 33% urea/67% BSFL frass blend at 281 kg N ha-1. Gradual mineralization of organic frass-N may have limited N early in the season, decreasing yield at increased frass proportions, whereas extended N mineralization later in the season helped maintain grain protein concentrations. Continued plant N uptake and unreleased organic frass-N at season’s end likely decreased soil NO3-N accumulation with frass blends. These results indicate that substituting up to one-third of urea with BSFL frass at recommended N rates may sustain HRS wheat grain yield and grain protein while substantially reducing NO3-N leaching potential.