Due to the complex composition of raw materials in compound (mixed) fertilizers, several key factors must be carefully considered when choosing the right type for agricultural use.
First and foremost, it's essential to tailor fertilizer selection to the specific soil conditions. In China, soil fertility varies significantly across regions, with differences in nutrient levels. Before applying any compound fertilizer, it's crucial to analyze the soil's nutrient content and choose a fertilizer that matches its needs in terms of both nutrient concentration and ratio.
Secondly, the target crop plays a significant role in determining the best fertilizer choice. Potassium is particularly important for improving crop quality, especially in high-value economic crops. However, potassium fertilizer availability remains limited in agriculture across China. Therefore, potassium-containing compound fertilizers should be prioritized for cash crops where their benefits can be maximized.
Third, different soils and crops require different types of compound fertilizers. For example, acidic soils and dry fields are best suited for nitrophosphate, while neutral or calcareous soils can benefit from chlorophosphorus-based fertilizers. The urea-phosphate system, on the other hand, is versatile and suitable for most soil types and crops. Crops sensitive to chlorine should receive fertilizers containing potassium sulfate, while tobacco crops are best supported by fertilizers made from ammonium phosphate and potassium sulfate. For food crops, compound fertilizers containing potassium chloride are often appropriate.
Fourth, combining compound fertilizers with single-nutrient fertilizers allows for more precise nutrient management. Since compound fertilizers have fixed nutrient ratios, blending them with single-nutrient products enables adjustments to nitrogen, phosphorus, and potassium levels, ensuring they meet the specific requirements of different crops and soil conditions.
This method of topdressing helps enrich the internal structure of the leaf and promotes better nutrient absorption, which is why it is also referred to as "heart filling." By following these guidelines, farmers can optimize fertilizer use, improve crop yield, and enhance overall agricultural productivity.
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