Table 5. Overview of Selected Review Papers on Lignin-Based Fertilizers.

review title	publication year	reference
Application of lignin in preparation of slow-release fertilizer: Current status and future perspectives	2022	(117)
Lignin-based controlled release fertilizers: A review	2022	(118)
Novel fertilizing products from lignin and its derivatives to enhance plant development and increase the sustainability of crop production	2022	(119)
Can lignin be transformed into agrochemicals? Recent advances in the agricultural applications of lignin	2021	(23)
Research Progress in Lignin-Based Slow/Controlled Release Fertilizer	2020	(120)
Lignin in Crop Cultivations and Bioremediation	2005	(121)
Nitrogenous Fertilizers From Lignins - a Review	2002	(122)