1、Which Foliar Fertilizers Are Effective During the Fruit Expansion Period?

Nutrient requirements can be precisely matched according to the crop growth stage: focusing on nitrogen fertilizer for growth during the seedling stage, boron fertilizer for pollination during the flowering period, and potassium fertilizer for ripening during the fruit expansion period.

2、Foliar spraying of potassium sulfate during fruit development

Potassium sulfate (K2 SO 4) is the best source for potassium supplementation to improve citrus fruit quality. Six-time K 2 SO 4 foliar application throughout fruit development noticeably increased the fruit quality, specifically sugar accumulation.

3、[Effects of different potassium fertilizer application periods on

However,the split potassium fertilizer application at the flowering and fruit enlargement stages resulted in the significant decrease in concentration of calcium in fruit,which would be negative to fruit quality.

(PDF) Potassium Nutrition of Fruit Crops

While muriate of potash (MOP) compares well with sulphate of potash (SOP) in the fruit orchards located in high rainfall light textured soils, SOP is superior for fruit crops grown under...

During the critical period of fruit expansion Calciumammoniumnitrat

Ammonium Nitrate Calcium + High-Potassium Water-Soluble Fertilizer: This is the “ultimate combo” during fruit expansion. Ammonium nitrate calcium supplies quick-acting nitrogen and calcium, while high-potassium fertilizers promote sugar transport and accumulation.

Which NPK Fertilizer to Use During The Fruiting Stage?

Sulphate of Potash (SOP) fertilizers have low chloride so plants are protected from chloride stress and have better fruit quality. JVF 11-11-17 SOP is highly recommended among the SOP fertilizers.

What fertilizer should be applied during fruit tree expansion？

This topdressing can effectively accelerate the rapid expansion of fruits and increase the cell expansion rate of fruits. It plays an important role in increasing yield, overcoming the "big and small years" of trees and promoting flower bud differentiation.

What Foliar Fertilizers Are Effective During the Watermelon's Fruit

Fertilizer for fruit swelling: The fruit swelling period of watermelon is the period when the fertilizer demand is the highest. At this time, potassium fertilizer should be applied heavily, along with nitrogen fertilizer and phosphorus fertilizer.

Effects of different potassium fertilizer application periods on the

In conclusion,our research suggested that evenly split application of potassium fertilizer as a base and at the fruit enlargement stage was the suitable period for apple production in Fuji apple orchards in this region. Keywords：

Effects of Foliar Potassium Fertilization on Fruit Growth Rate

In conclusion, foliar application of KNO3 is an efficient way to increase ‘Kousui’ japanese pear fruit yield, whereas spraying HAK is an effective way to improve the fruit quality.

During the fruit expansion period of fruit trees, the use of potassium fertilizers plays a crucial role in promoting fruit growth, enhancing quality, and increasing yield. Potassium fertilizers strengthen disease resistance, boost photosynthesis, improve stress tolerance, and enhance fruit flavor and appearance. Below are some recommendations for applying potassium fertilizers during this stage:

1. Types of Potassium Fertilizers

• Potassium Sulfate: A common potash fertilizer with high potassium content, rapidly absorbed by plants. Suitable for various fruit trees, including apples, pears, peaches, and apricots.
• Potassium Chloride: Lower in potassium but cheaper. Appropriate for fruits with moderate potassium demands, such as citrus.
• Potassium Nitrate: A high-potassium fertilizer containing both nitrogen and potassium. Ideal for trees requiring dual nitrogen-potassium supplementation, like grapes and cherries.
• Potassium Dihydrogen Phosphate: A compound fertilizer with phosphorus and potassium. Suitable for diverse fruit trees, promoting root development and fruit quality.

2. Timing of Application

• Base Fertilization: Apply before planting or after establishment to replenish early-stage nutrients. Adding potassium to base fertilizers supports root development and robust growth.
• Topdressing: During growth, apply timely topdressing based on tree health and soil conditions. Use foliar sprays or root-zone applications during the fruit expansion period to meet potassium demands.

3. Application Methods

• Foliar Spraying: Dissolve potassium fertilizer in water and spray evenly on leaves. This method quickly replenishes nutrients and reduces fertilizer loss.
• Root-Zone Application: Mix potassium fertilizer with soil and apply around roots to enhance absorption. Avoid direct contact with trunks or fruits to prevent burning.

4. Precautions

• Soil Conditions: Soil type affects potassium absorption. In acidic soils, potassium is more accessible; alkaline soils may require alternative formulations.
• Dosage Control: Excessive potassium can delay ripening and harm fruit quality. Follow "small doses, frequent applications," adjusting based on soil tests and tree health.
• Fertilizer Pairing: Combine potassium with nitrogen and phosphorus fertilizers for balanced nutrition. Proper pairing improves efficiency and growth outcomes.

5. Effects of Potassium on Fruit Trees

• Promotes Fruit Development: Strengthens cell walls, improves firmness, and enhances sugar accumulation for better taste.
• Improves Quality: Boosts antioxidant capacity, delays senescence, and extends shelf life.
• Enhances Disease Resistance: Strengthens immunity against pests and diseases, reducing pesticide reliance and environmental impact.
• Improves Soil Structure: Enhances soil aeration, water retention, and nutrient availability, aiding root absorption and growth.

selecting appropriate potassium types, application methods, and timing is critical during the fruit expansion period. Proper potassium management ensures healthy tree growth, superior fruit quality, and higher yields, delivering greater economic benefits to growers.