Potential use of mealworm frass as a fertilizer: Impact on crop growth and soil properties.

Abstract:

:Rearing insects is expected to dramatically increase during the next few years, and this will be associated with generating high quantities of frass (insect excreta). It is necessary to find solutions allowing the efficient valorization of these by-products before a major upscaling of the industry takes place. Therefore, this study aims at investigating the fertilizer potential of frass. A pot experiment was established and soil was amended either with mealworm (Tenebrio molitor L.) frass (10 Mg ha-1), with mineral fertilizer (NPK) at equivalent nutrient level to frass or with a mixture of 50% NPK and 50% frass. Changes of soil properties and growth and nutrient uptake by barley (Hordeum vulgare L.) were then analyzed. Due to its rapid mineralization and the presence of nutrient in a readily-available form, we found that frass is as efficient as mineral NPK fertilizer to improve biomass and N, P and K uptake by barley. Compared to mineral fertilizer, water soluble P concentration is five times lower in the presence of frass, which prevents P from loss and sorption onto soil constituents. More importantly, BIOLOG EcoPlate reveals that addition of frass stimulates soil microbial activity, especially when it is mixed with mineral fertilizer, suggesting a synergistic effect between both amendments. Taken together, our results indicate that frass has a great potential to be used as a partial or a complete substitute for mineral NPK fertilizer. This is especially relevant in the context of a reduced availability of mineral fertilizers while being consistent with circular economy's principles.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Houben D,Daoulas G,Faucon MP,Dulaurent AM

doi

10.1038/s41598-020-61765-x

subject

Has Abstract

pub_date

2020-03-13 00:00:00

pages

4659

issue

1

issn

2045-2322

pii

10.1038/s41598-020-61765-x

journal_volume

10

pub_type

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