1、Optimum Timing of Foliar Nutrient Sprays

For an optimum yield response to foliar fertilization it is possible that the optimum growth stage of the plant for the timing of foliar nutrient sprays does not necessarily fall within the recommended time interval as dictated by pesticide spraying.

2、Phosphorus and Potassium Fertilizer Application Strategies in Corn–Soybean Rotations

Phosphorus (P) and potassium (K) are essential nutrients for corn and soybean, comprising a significant proportion of total fertilizer expenditures, and can be yield limiting in many major crop production areas in the United States.

3、Performance test and parameter optimization of variable spraying liquid fertilizer machine

The performance test and parameter optimization of variable spraying liquid fertilizer machine was conducted in this research for the uniform spraying of foliar fertilizer. A crop protection of high-clearance tractor with a variable sprayer was used in the experiment.

4、Influence of potassium fertilization and foliar application of zinc and phosphorus on growth, yield components, yield and fiber properties of Egyptian

The objectives of the present study were to evaluate the effects of addition of K fertilizer and foliar spraying of chelated Zn and P, during square initiation and boll setting stage, on growth, yield and fiber properties of Egyptian cotton (Gossypium barbadense) grown on alluvial soil.

Potassium doses and frequency of application to alfalfa in a tropical soil

The objective of this study was to evaluate the effect of doses and frequency of application of potassium fertilizer on the alfalfa dry matter yield and potassium content in plant and soil.

Evaluate regional potassium fertilization strategy of winter oilseed rape under intensive cropping systems: Large

After selecting the best fit model, we would be able to calculate the economic optimum K rate (EOKR) and economic optimum yield (EOY) based on the average prices of K fertilizer (0.89$ K kg −1) and rapeseed (0.54$ kg −1) during the period of 2005–2010.

Potassium management in potato production in Northwest region of China

It also plays an important role for maintaining tone and vigor of the plants. Farmers traditionally applied nitrogen (N) and phosphorus (P) fertilizers but neglected K fertilizer in potato production of Northwestern China, due to a conception of sufficient soil K in this region.

Potassium release and fixation as a function of fertilizer application rate and soil parent material

In this study, release and fixation rates of K (kg ha − 1 yr − 1) were estimated in five long-term field experiments located on varying parent materials in South and Central Sweden, each having an array of K fertilizer application rates.

Effects of nitrogen, phosphorus and potassium fertilization on photosynthetic characteristics, yield and quality of Pulsatilla chinensis

The results showed that Pulsatilla chinensis had the greatest demand for nitrogen fertilizer, phosphate fertilizer had greater influence on photosynthetic characteristics, root growth and quality, and potassium fertilizer had more obvious influence on the growth of aboveground parts.

Fertilizer placement to improve crop nutrient acquisition and yield: A review and meta

Results showed that overall, fertilizer placement led to 3.7% higher yield, 3.7% higher nutrient concentration and 11.9% higher nutrient content in above-ground parts than fertilizer broadcast.

The frequency and timing of potassium fertilizer spraying depend on various factors, including crop type, growth stage, soil conditions, and climate. Potassium is crucial for plant growth, enhancing disease resistance, promoting root development, and improving water and nutrient absorption. Below is a detailed discussion on the optimal spraying frequency, timing, and methods, along with practical recommendations.

I. Optimal Frequency for Potassium Fertilizer Spraying

1. Early Growth Stage: During the initial growth phase, especially in the first few weeks after sowing, appropriate potassium spraying helps establish a strong root system. It is recommended to apply potassium fertilizer every two weeks to promote early root development.

2. Before and After Flowering: Potassium becomes critical during the flowering stage, as it significantly improves flower quantity and quality. Apply potassium once before flowering and once after to optimize reproductive health.

3. Fruit Ripening Stage: In this phase, potassium increases fruit weight and enhances taste. Spray every two weeks to ensure sufficient nutrient supply.

4. Post-Harvest: Avoid applying potassium during the plant’s dormant period after harvest. If supplementation is needed, resume in spring when growth restarts.

II. Best Timing for Potassium Spraying

1. Morning or Evening: Spray during cool periods (morning or evening) to avoid high temperatures, reduce evaporation, and ensure even distribution on leaves.

2. Calm Weather: Avoid windy conditions, as wind accelerates nutrient loss and reduces effectiveness.

3. Cloudy Days: Spraying on cloudy days minimizes leaf damage from intense sunlight and protects plants from heat stress.

III. Selection and Application of Potassium Fertilizer

1. Choose the Right Type: Select from options like potassium sulfate, potassium nitrate, or potassium phosphate based on crop needs and soil conditions.

2. Proper Dilution: Dilute according to product instructions to avoid waste or environmental harm from overconcentration.

3. Uniform Spraying: Ensure even coverage on leaves and stems using a sprayer. Avoid pooling in localized areas.

IV. Key Considerations

1. Avoid Overapplication: Excess potassium can lead to salt buildup, hindering growth. Follow recommended dosages strictly.

2. Combine with Other Fertilizers: Use potassium alongside nitrogen and phosphorus fertilizers for balanced nutrition. Coordinate application ratios and timing.

3. Soil Testing: Conduct soil tests before spraying to check potassium levels and pH. Adjust fertilizer type and amount based on results for optimal outcomes.

tailor potassium spraying frequency and timing to the plant’s growth stage and soil conditions. With proper planning, potassium application can significantly enhance crop yield and quality.