Investigate the Chemistry and Agricultural Efficacy of Hydrothermal Carbonization Processed Liquid Extracted from Willow (Salix babylonica) Branches, Seafood Compost, and Buckwheat (Fagopyrum esculentum) Green Foliage

Abstract

Hydrothermal Carbonization Processed Liquid (HTCPL) has been regarded as a by-product in the HTC process. This study focused on analyzing and comparing the composition and properties of HTCPL derived from willow (Salix babylonica) branches, seafood compost, and buckwheat (Fagopyrum esculentum) green foliage processed at 180 ℃ and 200 ℃ and evaluate the role of HTCPL in agriculture. The work found that the HTCPL samples are rich in macronutrients for plants. HTCPLs also contain a small number of micronutrients required by plants. Therefore, it is preliminarily considered that the HTCPL has the potential as a bio-fertilizer. Further experiments of this work indicated that HTCPL with different concentrations did not show the promoting effect on seed germination and seedling growth. But this work also found that the HTCPL extracted from different feedstocks with appropriate concertation can be used as a bio-fertilizer to cultivate pea (Pisum sativum L.) baby greens.