Which Crops Are Suitable for NPK Compound Fertilizer?

NPK compound fertilizer (containing nitrogen, phosphorus, and potassium) is one of the most widely used fertilizers in agricultural production. It provides the three essential nutrients required for plant growth—nitrogen (N), phosphorus (P), and potassium (K)—making it suitable for a variety of crops. However, different crops have varying nutrient requirements and absorption patterns. This article analyzes, based on scientific data, which crops are better suited for NPK compound fertilizers and how to apply them scientifically.

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Which Crops Are Suitable for NPK Compound Fertilizer?

1. Grain Crops: Rice, Wheat, Corn

• Rice: NPK fertilizers can meet nutrient demands during the tillering and jointing stages. Studies show that using compound fertilizers (e.g., 16-12-12) combined with split nitrogen applications can increase rice yields by 10%–15% (Source: Chinese Academy of Agricultural Sciences).

• Wheat: During the jointing stage, wheat requires increased nitrogen and potassium. Compound fertilizers (e.g., 18-12-10) help improve grain plumpness. Avoid excessive nitrogen to prevent lodging.

• Corn: The bell stage requires high-nitrogen compound fertilizers (e.g., 20-10-10), supplemented with phosphorus and potassium to enhance root development and lodging resistance.

2. Cash Crops: Cotton, Rapeseed

• Cotton: During the bud and boll stage, cotton has high phosphorus and potassium demands. Compound fertilizers (e.g., 15-15-15) can reduce boll shedding and improve fiber quality.

• Rapeseed: Requires supplemental boron. High-phosphorus compound fertilizers (e.g., 12-18-10) combined with borax as a base application can improve oil yield.

  
  

3. Vegetables: Leafy Greens, Solanaceous Fruits, Root Tubers

• Leafy Greens (Spinach, Lettuce): Require high-nitrogen compound fertilizers (e.g., 20-10-10), but application rates must be controlled to prevent nitrate accumulation.

• Solanaceous Fruits (Tomatoes, Peppers): The fruiting stage demands high-potassium fertilizers (e.g., 15-5-20) to promote fruit expansion.

• Root Tubers (Potatoes, Sweet Potatoes): The tuber bulking stage requires high-potassium fertilizers (e.g., 12-12-24) to enhance starch content.

4. Fruit Trees: Apples, Citrus

• Apples: Young trees need balanced fertilizers (e.g., 17-17-17), while fruit-bearing trees require high-potassium fertilizers (e.g., 15-5-25).

• Citrus: The fruit expansion stage requires potassium to account for over 50% of nutrient uptake. Compound fertilizers (e.g., 16-6-20) can help reduce fruit cracking.