1、Foliar Fertilizer Applications on Sweet Potato

All foliar fertilizer treatments resulted in higher sweet potato yield than the no foliar check. Ferti-Rain and ferti-Rain + Pro-Germinator provided the best yields, indicating that the crop needed both phosphorus and potassium, as well as some nitrogen and sulfur.

2、Potassium Fertilizer for Sweet Potato

Spraying potassium on the leaves In the late growth stage of sweet potato, spraying K fertilizer solution on the leaves has a significant effect on yield increase.

3、12 Best Fertilizer For Sweet Potato [Organic & Inorganic]

In this article, we have compiled a list of the 12 best fertilizers for sweet potatoes that can help you achieve optimal growth and yield.

What is the Best Fertilizer for Sweet Potatoes: Optimal Nutrient Guide

The key nutrients for sweet potatoes are potassium and phosphorus, which facilitate healthy root development and improve yield. A well-balanced fertilizer with an NPK ratio of 5-10-10 or 8-24-24 is often recommended for sweet potatoes.

(PDF) Effect of Potassium Fertilizer and Foliar Zinc Application on

Four rates of potassium fertilizer (60, 90, 120 and 150 kg K O/fed.) in the form of 2 potassium sulfate (48% K O) and four levels of foliar zinc fertilizer (0, 10, 20 and 30 ppm) in the...

What Fertilizer to Use for Sweet Potatoes? Boost Your Harvest

NPK ratios refer to the proportion of nitrogen, phosphorus, and potassium in a fertilizer. For sweet potatoes, a balanced NPK ratio of 10-10-10 or 15-15-15 is recommended. Soil pH affects fertilizer availability and uptake. Sweet potatoes prefer slightly acidic to neutral soil pH (5.5-7.0).

Fertilizing Sweet Potatoes: How, When, and What to Use

Choosing the Right Fertilizer Fertilizers with lower nitrogen and higher phosphorus and potassium content are suitable for sweet potatoes. Look for N-P-K ratios such as 5-10-10 or 8-24-24, which emphasize root and tuber development. While a balanced fertilizer like 10-10-10 can be used at planting, avoid excessive nitrogen later in the season.

Which Fertilizer Is Best For Sweet Potatoes

Optimal N-P-K ratios for sweet potatoes are around 5-10-10 or 8-24-24, emphasizing potassium’s importance, as these plants are heavy feeders requiring a phosphorus-rich fertilizer. Formulations such as 10-10-10 or 8-8-8 are suitable alternatives.

Growing Sweet Potatoes

Sweet potatoes remove large amounts of potassium at harvest, requiring replenishment. Yield responses to K are common. Recommendation: Use sulfate-based potassium sources like Polysulphate, which also supplies calcium, magnesium, and sulfur in plant-available forms.

Potassium Fertilizer Techniques for Sweet Potato

Because sandy soil has poor water retention and fertilizer retention, it is advisable to use semi-perishable organic fertilizer as the base fertilizer, and clay soil should be applied with mature organic fertilizer.

Which Potassium Fertilizer is Better for Sweet Potato Foliar Spraying?

Sweet potato is a common crop that requires significant amounts of potassium during its growth. As an essential nutrient for plant development, potassium plays a critical role in improving growth, fruit quality, and yield. Selecting the appropriate potassium fertilizer is therefore crucial for sweet potato cultivation.

I. Sweet Potato’s Demand for Potassium Fertilizer

1. Root System Development: Potassium promotes root growth, enhancing water and nutrient absorption. This improves the plant’s resistance to diseases and stress.
2. Fruit Quality: Potassium improves skin smoothness, color vibrancy, sweetness, and overall eating quality.
3. Yield Increase: Adequate potassium accelerates growth rates and boosts per-plant productivity, leading to higher total yields.
4. Soil Health: Potassium optimizes soil structure, improves water retention, and reduces erosion.

II. Common Types of Potassium Fertilizers

1. Potassium Sulfate: Rapidly absorbed by plants, it effectively supports sweet potato growth.
2. Potassium Nitrate: A high-nitrogen, low-phosphorus compound that provides both nitrogen and potassium while minimizing phosphorus overuse.
3. Potassium Chloride: A widely used potassium source, but require moderate application to avoid excessive salt buildup.
4. Potassium Phosphate: A phosphorus-potassium compound that nourishes overall growth while supplementing potassium.

III. Application Methods and Precautions

1. Base Application: Apply evenly before planting or after transplantation, then incorporate into the soil for sustained nutrient release.
2. Topdressing: During growth, apply based on plant condition and soil tests. Use 20-30 kg/mu of compound fertilizer or 5-10 kg/mu of potassium sulfate. Avoid overapplication to prevent salt accumulation.
3. Foliar Spraying: Directly apply potassium to leaves for efficient absorption. Use 1-2 kg/mu of potassium sulfate per spray, repeating every 7-10 days.

IV. Key Considerations

1. Variety Selection: Choose sweet potato varieties with optimal potassium requirements. Some fast-growing, lean-soil-tolerant types may perform well under lower potassium conditions.
2. Balanced Fertilization: Combine potassium with other nutrients (e.g., pair nitrogen with potassium to improve efficiency, or phosphorus with potassium to reduce excess phosphorus).
3. Soil Conditions: Adjust applications based on soil pH, temperature, and moisture, as these factors affect potassium uptake.

selecting the right potassium fertilizer and applying it scientifically can significantly enhance sweet potato yield and quality, delivering better economic returns for farmers.