Abstract
The problems arising from the limited availability of natural resources and the impact of certain anthropogenic activities on the environment must be addressed as soon as possible. To meet this challenge, it is necessary, among other things, to reconsider and redesign agricultural systems to find more sustainable and environmentally friendly solutions, paying specific attention to waste from agriculture. Indeed, the transition to a more sustainable and circular economy should also involve the effective valorization of agricultural waste, which should be seen as an excellent opportunity to obtain valuable materials. For the reasons mentioned above, this review reports and discusses updated studies dealing with the valorization of agricultural waste, through its conversion into materials to be applied to crops and soil. In particular, this review highlights the opportunity to obtain plant biostimulants, biofertilizers, and biopolymers from agricultural waste. This approach can decrease the impact of waste on the environment, allow the replacement and reduction in the use of synthetic compounds in agriculture, and facilitate the transition to a sustainable circular economy.
Highlights
This review addresses the problems of the valorization of agricultural residues to reduce their environmental impact and obtain new strategic solutions to increase productivity and sustainability of agricultural systems
This review addresses the idea of reporting recent studies aimed at obtaining from agricultural waste substances that can be applied to crops to improve their productivity and resistance to environmental stresses and restore soil fertility and nutrient content
Plant biostimulants (PB)Aspects are a very complex, heterogeneous, and varied group of substances, which can be obtained from many different raw materials
Summary
Over the years, exciting approaches have been studied, such as waste thermal revalorization by the production of bioenergy With this aim, scientific literature has proposed various studies generally focused on a single possible use of the waste. There is a complete lack of an approach that considers agro-industrial waste in its entirety as a starting material for the diversified production of substances to be used in agriculture but with different objectives. In this context, this review’s scientific hypothesis is to investigate the potential of waste for making bio-based materials such as biostimulants, biofertilizers, and biopolymers. Biostimulants, biofertilizers, and biopolymers can increase crop productivity and improve soil health
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