1、SL381/SS583: Potassium (K) for Citrus Trees

Apply K fertilizer at a K 2 O rate equal to the N rate. If leaf K is consistently less than optimum from year to year, increase the K 2 O rate by 25%. Low leaf K concentrations are common in groves planted on calcareous soils.

2、Citrus fruit yield response to nitrogen and potassium fertilization

Herein, it is proposed that a comprehensive evaluation of nutrient dynamics in the soil-plant system is a suitable alternative to refine fertilization management programs in irrigated and fertigated citrus groves in tropical soils.

3、Increase Citrus Yield with Potassium Nitrate Fertilizer

Q: What should I consider when planning potassium nitrate fertilizer applications for citrus trees? A: When planning applications, consider factors such as the tree’s growth stage, soil nutrient levels, and the local climate conditions to ensure that fertilization aligns with the tree’s needs.

The Optimal Time for Applying Potassium Fertilizer to Citrus Trees

By adjusting your citrus fertilizer program based on spring growth, summer fruiting, fall root renewal, and winter dormancy, you’ll maximize productivity and long-term tree vitality.

Role of Potassium in Citrus Production

Citrus fruit takes up more potassium than any other nutrient. Application rates can be calculated based upon leaf or soil analysis – the latter being most commonly used.

Potassium Affects Citrus Tree Performance

The various potassium fertilizers should be used with attention to the effects of rainfall, salinity and counter ions. Cultivators of modern intensive citrus orchards should pay attention to the potassium level in the trees and react accordingly.

Citrus Fertilizer Management: Nutrient Requirements and Application

Phosphorus and potassium are also important macronutrients for young citrus trees, promoting root growth and development. The recommended rates depend on soil test results, with higher levels requiring no additional application.

PDF: OPTIMIZATION OF NEW GENERATION POTASSIUM (NG

The conducted field experiment assessed the impact and response of different levels of K applications on the quality and yield parameters of citrus fruit, determining a suitable time, stage, and K fertilizer dose for citrus trees.

What Fertilizer Do You Use for Citrus Trees: Tips for Optimal Growth

Learn how to boost tree growth and maximize fruit production by providing crucial nitrogen, phosphorus, and potassium. Follow our expert tips to ensure your citrus trees thrive and yield bountiful harvests.

2026–2026 Florida Citrus Production Guide: Nutrition

The following description of citrus fertilizer uptake, soil and leaf testing, and nutrient recommendations was taken from EDIS publication SL253, Nutrition of Florida Citrus Trees, 3rd Edition, edited by Kelly T. Morgan and Davie M. Kadyampakeni.

Potassium fertilizer is critical for the growth of citrus trees, as it enhances fruit quality, disease resistance, flower bud differentiation, and physiological functions of leaves. When applying potassium fertilizer, factors such as soil type, tree age, growth stage, and climatic conditions must be considered to optimize fertilization effects. Below is a detailed guide on methods and precautions for applying potassium fertilizer to citrus trees.

1. Assess Soil Potassium Content

Before fertilization, analyze the soil’s potassium content by testing soil samples. If potassium levels are low, increase the application rate accordingly. Generally, soil potassium content in citrus orchards should remain between 1-2%.

2. Choose the Right Type of Potassium Fertilizer

Various potassium fertilizers are available, including potassium sulfate, potassium chloride, and potassium nitrate. Select based on soil type, tree growth stage, and climate. For example, potassium sulfate and potassium chloride suit acidic soils, while potassium nitrate is better for neutral or alkaline soils.

3. Determine Application Rates

Adjust application rates based on soil potassium levels and tree needs. Typically, apply 50-100 kg of potassium sulfate, 50-100 kg of potassium chloride, or 30-50 kg of potassium nitrate per mu (0.067 hectares) annually. Fine-tune rates according to specific conditions.

4. Fertilization Methods

Two main methods are used: base fertilizer (pre-planting) and topdressing (during growth).

• Base Fertilizer: Mix potassium fertilizer with organic matter and spread evenly on the soil surface before planting. Incorporate into the soil to ensure sustained nutrient release.
• Topdressing: Apply periodically based on soil tests and tree health. Use foliar spraying (spray potassium solutions onto leaves) or soil application (dissolve fertilizer in water and spread over soil) to supplement nutrients.

5. Timing of Application

Apply during peak growth seasons: spring and autumn. Reduce or pause applications during summer’s heat, as trees grow more slowly.

6. Precautions

• Avoid Overapplication: Excessive potassium raises soil salinity, harming trees and fruit quality.
• Balance with Other Fertilizers: Coordinate with nitrogen, phosphorus, and other nutrients for optimal growth.
• Proper Techniques: Follow guidelines to prevent waste or damage.

rational use of potassium fertilizer ensures healthy citrus growth and high-quality fruit. By assessing soil needs, selecting appropriate fertilizers, adjusting application rates, timing, and methods, and avoiding common mistakes, citrus trees can thrive with balanced nutrition.