1、Potassium fertilizer management improves rice yield by optimizing the

Shading stress reduces rice yield by decreasing leaf photosynthesis. Potassium fertilization increases LAI and leaf photosynthesis of rice. Potassium (K) improves the grain yield and stress resistance of crops; however, its effect on rice under shading stress is unclear.

2、Current Understanding of Leaf Senescence in Rice

Leaf senescence, which is the last developmental phase of plant growth, is controlled by multiple genetic and environmental factors. Leaf yellowing is a visual indicator of senescence due to the loss of the green pigment chlorophyll.

3、Photosynthesis and senescence gene expression drive yield

Addressing this gap, this study examines the effects of long-term fertilization on early-season rice (Oryza sativa) in China, where double-cropping rice systems dominate the Yangtze River...

4、Effects of Nitrogen Fertilizer Applications on Photosynthetic

Under the N5 treatment, the green leaf area maintained longer, the leaf area degradation after anthesis was slower, the photosynthetic potential was higher, and the dry matter accumulation post-anthesis was increased, which were all beneficial to rice photosynthesis, thus increasing grain yield.

5、Leaf senescence characteristics and economic benefits of rice under

They were started 10 days after transplanting (DAT) and continued until the maturity of rice. A continuous layer (10–60 mm) of water was maintained in the CI plots after transplanting until the final drainage was approximately 10 days before the harvest.

Faster leaf senescence after flowering in wet directâ seeded rice was

In conclusion, faster leaf senescence after flowering in WDSR was mainly attributed to the decline in leaf CTK content. Hongyan Liu and Aibin He contributed equally to this work.

Maintaining higher leaf photosynthesis after heading stage could

We propose that maintaining a high A after heading, rather than having high maximum A, is a potential target for enhancing rice biomass accumulation. Rice (Oryza sativa) is one of the most...

Nitrogen, phosphorus, and potassium fertilization affects the flowering

In 2017, the initial flowering of rice with N 0 treatment was 51 days after transplanting, and the initial flowering of rice was delayed by 1–3 days after N application.

How foliar feeding works on rice

Shortfalls of potassium cause a wide range of deficiency symptoms including leaf discolouration, unhealthy black roots, more unfilled grains, reduced grain weight and greater lodging. Foliar feeding is ideal for potassium because the cations are highly mobile, both into and within the rice leaves.

Photosynthetic Enhancement, Lifespan Extension, and Leaf Area

Transgenic rice plants overproducing Rubisco by 30% (RBCS -sense rice plants) showed up to 28% increase in grain yields under sufficient nitrogen (N) fertilization using an isolated experimental paddy field (Yoon et al. in Nat Food 1:134–139, 2020).

The phenomenon of rice leaves turning green within a few days after foliar fertilization typically occurs when water-soluble fertilizers containing nutrients like nitrogen (N), phosphorus (P), and potassium (K) are applied. This rapid greening can result from multiple factors. Below, I explain the mechanisms and principles behind this observation.

I. Nutrients in Fertilizers

1. Nitrogen (N): Nitrogen is critical for plant growth, particularly for protein synthesis and chlorophyll production. When rice leaves absorb nitrogen-rich fertilizers, chlorophyll content increases, causing leaves to appear greener.

2. Phosphorus (P): Phosphorus promotes root development, cell division, and photosynthesis. A lack of phosphorus leads to stunted growth and yellowing leaves.

3. Potassium (K): Potassium enhances disease resistance, improves stress tolerance, and facilitates water and nutrient transport within plants.

4. Microelements: Elements like calcium (Ca), magnesium (Mg), and sulfur (S) play less prominent but essential roles in physiological processes.

II. Fertilization Methods and Environmental Conditions

1. Fertilization Practices: Proper application is key. Avoid spraying fertilizers directly onto leaves to prevent foliar burn or phytotoxicity. Follow the "small doses, frequent applications" principle to minimize nutrient waste.

2. Environmental Factors:

   • Light: Insufficient light reduces photosynthesis and chlorophyll synthesis.
   • Temperature/Humidity: High temperatures and humidity accelerate fertilizer decomposition and loss.

3. Soil Conditions:

   • Soil pH, structure, and fertility affect nutrient availability. For example, acidic soils may bind iron to fertilizers, reducing efficacy, while alkaline soils inhibit microbial activity.

III. Biological Activity and Chemical Properties

1. Biological Activity: Some fertilizers contain microbial agents that produce bioactive substances (e.g., enzymes, antibiotics) under suitable conditions. These promote growth and improve crop quality.

2. Chemical Properties: Fertilizer composition (e.g., solubility, stability) and interactions with soil components influence effectiveness.

IV. Plant Physiological Responses

1. Root Absorption: Plants absorb water and dissolved nutrients (N, P, K) through roots. Efficiency depends on fertilizer concentration, soil pH, and root health.

2. Transport Mechanisms: Nutrients are distributed via internal transport systems, influenced by hormones and gene expression.

3. Metabolic Pathways: Plants convert absorbed nutrients into energy and organic compounds through metabolic pathways, regulated by enzymes and genes.

V. Recommendations and Precautions

1. Rational Fertilization: Tailor fertilizer type and dosage to rice growth stages and soil conditions to avoid over-fertilization.

2. Monitor Crop Response: Observe leaf changes when using new fertilizers to detect issues early.

3. Adjust Management: Modify irrigation, drainage, and pest control practices based on crop health and environmental conditions to optimize fertilizer use and stress resistance.

The rapid greening of rice leaves after foliar fertilization is a complex process influenced by nutrient composition, application methods, environmental factors, biological activity, and plant physiology. To maximize fertilizer efficiency, these elements must be carefully considered and managed.

This translation maintains the original structure, technical terminology, and detailed explanations while adapting them for clarity in English. Let me know if further refinements are needed!