Due to the complex composition of raw materials in compound (mixed) fertilizers, several key factors must be considered when choosing the right type for agricultural use.
First, it's essential to tailor fertilizer selection to the specific soil conditions. In China, soil fertility varies significantly across regions, with differences in nutrient content and pH levels. Before applying compound fertilizers, it’s important to conduct a soil test to determine its nutrient status. Based on this information, you can choose fertilizers that match the soil’s needs in terms of both nutrient content and ratio.
Second, the target crop should guide your choice. Potassium plays a crucial role in enhancing crop quality, especially for high-value economic crops. However, potassium-based fertilizers are limited in availability in China. Therefore, it's advisable to prioritize potassium-containing compound fertilizers for cash crops such as fruits, vegetables, or other high-value plants.
Third, different soils and crops require different types of compound fertilizers. For example, acidic soils and dry fields benefit from nitrophosphate, while neutral and calcareous soils are better suited for chlorophosphorus-based fertilizers. The urea-phosphorus system is versatile and suitable for most soil types and crops. For crops sensitive to chlorine, potassium sulfate-based compounds are preferable. Tobacco, for instance, benefits from fertilizers made with ammonium phosphate and potassium sulfate, while food crops can safely use those containing potassium chloride.
Fourth, combining compound fertilizers with single-nutrient fertilizers allows for more precise nutrient management. Since compound fertilizers have fixed nutrient ratios, mixing them with individual nutrients enables better adjustment of nitrogen, phosphorus, and potassium levels to meet the specific requirements of different crops and soil conditions.
This method of application not only enriches the internal structure of the plant but also enhances its ability to absorb nutrients efficiently, often referred to as "heart filling." This technique helps improve overall plant health and productivity, making it an effective strategy in modern agriculture.
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