1、Effects of potassium fertilizer application rates on rapeseed yield and

Increasing potassium fertilizer application is an effective strategy to enhance stress resistance and mitigate yield losses caused by frost damage. This study aimed to evaluate the effects of different potassium fertilizer rates on rapeseed yield reduction following frost damage.

2、Effects of nitrogen, phosphorous, and potassium fertilization on

This study examined the impact of early 2024 freeze stress on rapeseed yields in the Yangtze River Basin, China, and assessed yield responses to nitrogen (N), phosphorus (P), and potassium (K) fertilizer rates.

3、Effect of potassium i

Commonly, K fertilizer was applied at one time before sowing in large field produce. Early application of K promoted the development of root system and ensured seedlings to survive safely during winter. It was suggested that K fertilizer should be split applied at several times on sandy soil.

4、Effects of nitrogen, phosphorous, and potassium fertilization on

These results suggested that the application of K fertilizer can mitigate the effect of freeze stress on rapeseed yield at both study sites. Temperature is one of the key factors in uencing biomass production

5、Effects of potassium fertilizer rates on biomass, yield and

Field experiments were conducted to investigate the effects of different application rates of potassium chloride （KCl） on biomass, seed yield, and nutrient accumulation and distribution in oilseed rape at both the seedling and maturity stages.

Characteristics of Potassium Utilization and Crop Yield

As the K fertilizer application rates increased, the proportion of K uptake in rapeseed within the annual system rose, with the average K uptake ratio between rice and rapeseed being 3:2.

Effects of potassium application rate on the yield and quality of

Here, we investigate the effect of different K fertilizer application rates on oilseed rape yield and seed quality to provide theoretical support for the rational application of K fertilizer in winter oilseed rape production for high yield and quality.

When and How to Apply Potassium Fertilizer for Rapeseed

In order to increase fertilizer efficiency, nitrogen and phosphorus should be mixed, deep ditch or acupuncture should be applied, and random application of fertilizers can result in loss of fertilizer.

论文_III农学

Phosphorus and potassium had great effect on rapeseed yield and nutrient use efficiency in the Yangtze River winter rapeseed cultivated area. Application of 135 kg P2O5/hm2 produced the highest yield increment of 1,460 kg/hm2, about 2.2 times higher than the zero P treatment.

Balanced Application of Nitrogen, Phosphorus and Potassium Fertilizer

Rice-rapeseed rotation is an important paddy-upland crop rotation in China, and the application of nitrogen (N), phosphorus (P) and potassium (K) fertilizer plays an important role in guaranteeing high and stable crop yields.

The impact of potassium fertilizer on the growth of rapeseed seedlings is complex, as it can either promote or inhibit their development. In agricultural production, rational application of potassium fertilizer is critical for improving the yield and quality of rapeseed. Below, we explore whether applying potassium fertilizer can kill rapeseed seedlings and the underlying reasons.

I. Positive Effects of Potassium Fertilizer on Rapeseed Seedlings

1. Promotes Root Development: Potassium fertilizer enhances the plant’s ability to absorb nutrients from the soil, particularly phosphorus and calcium. Potassium ions participate in various enzymatic reactions within plants, playing key roles in cell division, elongation, and maturation. Thus, appropriate application of potassium fertilizer stimulates root growth, enabling seedlings to absorb water and nutrients more efficiently.

2. Improves Stress Resistance: Potassium fertilizer strengthens a plant’s resistance to drought, cold, and other adversities. It increases the accumulation of osmoprotectants like proline, which help maintain water balance in cells and mitigate damage from stressful conditions.

3. Enhances Photosynthesis: Potassium improves photosynthetic efficiency by participating in critical processes such as the Calvin cycle and chlorophyll synthesis. This boosts growth rates and crop yields.

4. Improves Crop Quality: Potassium contributes to better fruit sweetness, vegetable color, and texture. It regulates metabolic pathways involved in sugar, protein, and fat synthesis, thereby enhancing product quality.

5. Reduces Disease Risk: Potassium strengthens plant immunity by promoting antimicrobial peptide synthesis and antioxidant enzyme activity, protecting crops from pathogens.

II. Potential Risks of Potassium Fertilizer on Rapeseed Seedlings

1. Scorching from Excessive Use: Overapplying potassium fertilizer can raise soil salinity, accelerating water evaporation and causing surface dryness or "scorching," especially during hot, rainy seasons when transpiration is intense.

2. Disrupts Nitrogen Uptake: When used with nitrogen fertilizers, potassium ions compete with ammonium ions for uptake, reducing nitrogen absorption. Excess potassium may lead to nitrogen deficiency, stunting seedling growth.

3. Interferes with Micronutrient Absorption: Overapplication may inhibit uptake of essential micronutrients (e.g., iron, zinc, copper). These elements are vital for processes like chlorophyll synthesis (iron) and protein formation (zinc), and imbalanced concentrations can disrupt plant physiology.

4. Alters Soil pH: High doses of potassium fertilizers (e.g., potassium sulfate) can neutralize alkaline soil components (e.g., calcium, magnesium), raising soil pH. This affects microbial activity and nutrient availability.

5. Soil Compaction: Long-term overuse of potassium fertilizers can lead to soil compaction. Acidic components in the fertilizer react with alkaline soil particles, forming hardened layers that restrict root growth and nutrient uptake.

While potassium fertilizer benefits rapeseed seedlings by promoting roots, photosynthesis, and stress resistance, excessive use poses risks such as scorching, nutrient imbalances, and soil degradation. Farmers should apply potassium rationally, considering soil conditions and crop needs, to ensure healthy growth.