1、Effect of potassium application in drought

Effect of potassium (K) application through leaves (LA) or roots (RA) was studied in tobacco plants grown under K deficiency and drought stress conditions. Application of K was effective in improving the shoot growth only under drought conditions, whereas root biomass and length responded under both watering regimes.

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

Under the conditions of this study, applying K fertilization at 47.4 kg ha −1 combined with spraying cotton plants with zinc at 57.6 g ha −1 and also with P at 1 728 g ha −1 improved growth and yield of Egyptian cotton.

3、The Effect of Foliar Fertilization on the Yield and Quality of Different Crops

To avoid these complications, preventive foliar fertilization can be useful, specially for varieties with a high potential of yield and quality, and in climatically suboptimal years.

4、RESPONSE OF MAIZE TO FOLIAR VS. SOIL APPLICATION OF NITROGEN–PHOSPHORUS–POTASSIUM FERTILIZERS: Journal of Plant Nutrition: Vol 25 , No 11

The aim of the present study was to determine the efficiency of different forms of nitrogen–phosphorus–potassium (NPK) fertilizers applied to maize (Zea mays L.), either to the soil or to the leaves.

5、The Effect of Rate and Source of Potassium Fertilizer on Cured Leaf Yield of Burley Tobacco and Leaf Content and Soil Test Levels of Potassium and Magnesium

To compare the two K sources, we selected field sites low enough in soil test K levels that normally would result in increased tobacco yields due to application of fertilizer K.

Cumulative release characteristics of controlled

Many studies have found that the application of controlled-release urea (CRU) and controlled-release potassium (CRK) greatly improved the yields and fertilizer use efficiencies of crops.

Alleviation of waterlogging damage by foliar application of nitrogen compounds and tricyclazole in canola

The objective of this work was to compare the effects of foliar applications of urea, calcium nitrate, potassium nitrate and tricyclazole on responses of canola plants under waterlogging stress.

Effect of Foliar and Soil Application of Potassium Fertilizer on Soybean Seed Protein, Oil, Fatty Acids, and Minerals

Potassium concentration in leaves was high in all treatments, and the highest percentage of K (2.75%) was observed at the higher rate of foliar application (T2) compared to control (1.90%) (Table 1).

Comparison of Foliar and Root Application of Potassium Dihydrogen Phosphate in Regulating Cadmium Translocation and Accumulation in Tall Fescue

Thus, the objectives of this study were to investigate the difference of the foliar and root applications of KH 2 PO 4 on the cadmium accumulation pattern and the mechanism of Cd tolerance enhanced by the foliar KH 2 PO 4 application in tall fescue.

Foliar application of microbial and plant based biostimulants increases growth and potassium uptake in almond

There was a substantial positive effect of both biostimulant treatments on total shoot leaf area, and significant increases in shoot length and biomass under adequate soil potassium supply with a positive effect of Bio-1 only under low K supply.

The impact of foliar potassium fertilization on tobacco leaf yellowing is a complex process involving multiple factors, including plant physiology, soil environment, and nutrient uptake efficiency. Below is a detailed analysis of this issue:

1. Functions and Characteristics of Potassium Fertilizer

Potassium is an essential nutrient for plant growth, playing a critical role in physiological development. It enhances cellular osmotic pressure, improves leaf water retention, and strengthens stress resistance in tobacco leaves. Additionally, potassium promotes the synthesis of proteins and carbohydrates, thereby improving tobacco quality.

2. Accumulation of Potassium in Tobacco

Tobacco leaves require substantial potassium to maintain normal physiological functions during growth. Adequate potassium accumulation enhances leaf quality, resulting in brighter color and better taste. Thus, appropriate potassium application is vital for optimal growth and quality improvement.

3. Impact of Potassium on Tobacco Leaf Yellowing

Excessive potassium content in tobacco leaves may lead to yellowing. High potassium levels disrupt stomatal regulation, affecting photosynthesis and respiration. Reduced photosynthetic activity causes accumulation of sugars and amino acids, which can trigger yellowing.

4. Reasons for Yellowing Caused by Foliar Potassium Application

(1) Excessive Application: Overapplication of potassium fertilizer leads to supraoptimal potassium levels, disrupting physiological balance. (2) Uneven Distribution: Localized overconcentration of potassium in specific leaf areas, while other regions lack sufficient potassium, induces yellowing. (3) Environmental Factors: Soil pH, temperature, and humidity influence potassium absorption. For example, acidic soils reduce potassium availability, exacerbating yellowing.

5. Strategies to Prevent or Mitigate Yellowing

(1) Rational Application: Control dosage based on soil tests and crop needs to avoid excess. (2) Uniform Distribution: Ensure even spread of potassium on soil or leaves. (3) Soil pH Adjustment: Apply lime or other alkaline materials to optimize potassium efficacy. (4) Soil Health Improvement: Enhance organic matter and soil structure to boost nutrient absorption.

Foliar potassium application can contribute to tobacco leaf yellowing, but this effect is manageable through scientific fertilization practices. Key measures include dosage control, soil condition monitoring, and balanced nutrient distribution. By adopting these strategies, high-quality and productive tobacco cultivation can be achieved.