Those involved in the production and use of chemical fertilizers are well aware of one key principle in scientific fertilization: the law of diminishing returns. This economic principle states that, under stable conditions such as irrigation, crop variety, and farming practices, increasing fertilizer application initially boosts crop yield. However, once a certain threshold is exceeded, further increases in fertilizer input can actually reduce yields. This concept is widely applied not only in agriculture but also in industries and animal husbandry. Simply put, farmers must ensure that the benefits gained from using a dollar’s worth of fertilizer exceed that dollar to make it profitable.
Today, many new fertilizer products on the market come with higher prices compared to traditional options. While this raises the cost for farmers, few have asked whether these new products truly provide greater returns. Are the additional costs justified? How much extra value do they bring? Is there any economist or agronomist who has analyzed the point at which the return on investment starts to decline when purchasing these new products? If the input-to-output ratio is unreasonable, such products should not be promoted as innovations.
Moreover, while the development of fertilizer products has become increasingly diverse, improving crop yield, enhancing nutrient efficiency, and reducing non-point source pollution are not the only paths forward. The answer is no. Practices like deep fertilizer application, layered fertilization, and integrated water-fertilizer systems—promoted by the Ministry of Agriculture—are effective solutions. We should not focus solely on product innovation but also on managing fertilization stages and optimizing application methods. Deep application and stratified fertilization not only boost yield but also significantly improve fertilizer efficiency and increase soil organic matter content.
Scientific fertilization still has a long way to go in China. The first step is to instill the idea of scientific fertilization among farmers. Currently, the overemphasis on developing new chemical fertilizer products misleads both the practice of scientific fertilization and the direction of enterprise development. This approach is irresponsible toward China’s agricultural security and long-term sustainability.
In conclusion, while innovation in fertilizer products is important, it must be balanced with proper application techniques and a deeper understanding of economic principles. Farmers need guidance, not just more expensive options. Only through a holistic approach can we achieve sustainable and efficient agricultural growth.
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