Since the invention of synthetic ammonia through the Haber–Bosch process, a significant amount of chemical fertilizer has been utilized to enhance plant productivity. However, the low efficiency of common fertilizers used for plant nutrition not only leads to the wastage of valuable resources but also contributes to environmental pollution and ecological imbalance. Overall health, encompassing soil health, environmental health, and human health, calls for new, more efficient, and environmentally friendly agrochemicals. The innovation in plant nutrition-related agrochemicals, including new fertilizer products, is an essential method to improve the efficiency of plant nutrient use, addressing the challenges posed by global population growth, resource shortage, and environmental crisis.

The updated and upgraded agrochemicals, including plant biostimulants, biochar, fertilizer products, plant nutrition regulators, and other nutrition-related agrochemicals, play a crucial role in enhancing plant productivity and promoting agricultural sustainability. This article collection aims to bridge the gap between potential advancements in both listed and unlisted agrochemical products while advancing plant-product interrelation mechanisms behind their application effects. Recent advancements could offer significant opportunities for more scientific management of plant nutrition through application effects and innovative mechanisms.

Products of biostimulants have emerged in an endless stream and have been used more widely in horticultural crops. Value-added fertilizers, produced by incorporating bioactive substances into conventional fertilizers, are on the rise in China. Organic substances applied to plant production also enrich the theory of plant organic nutrition. Furthermore, innovative agricultural inputs like coated fertilizers, nano-fertilizers, fertilizer additives, biochar, and microbial preparation have the potential to enhance crop production while reducing reliance on traditional chemical inputs.

The future is shaped by innovation. The potential application effects of these new agrochemicals provide a fresh impetus for sustainable management of plant nutrition. Meanwhile, the novel mechanisms of plant nutrition behind these agrochemicals will also bring theoretical innovations that will drive new developments in the specialty. This Research Topic will bring together the latest advances in the application and mechanism of plant biostimulants, biochar, fertilizer products, and other agrochemicals.

Our Research Topic is open to contributions in any of the below, but not limited to, themes related to plant nutrition-related agrochemicals, such as:

• New types of fertilizers developed to enhance the efficiency of common fertilizer
• Biostimulants applying to promote nutrient absorption and utilization by the plant
• Biochar using to improve soil fertility and accelerate soil nutrient cycling
• Fate of foliar agrochemicals in plants
• Physiological and Molecular Responses
• Interaction between plant and agrochemicals
• Agrochemicals involved in plant–soil interaction
• Role and mechanism of plant nutrition regulator

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