Optimizing the application of potassium sulfate fertilizer based on the variation in soil mineral accumulation and tobacco growth: a 10-year field experiment
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View abstract on PubMed
Summary
This summary is machine-generated.The optimal application of potassium sulfate fertilizer (K<sub>2</sub>SO<sub>4</sub>) in Shandong improves tobacco yield and quality by increasing potassium content. The recommended rate of K<sub>165</sub> + S<sub>95.7</sub> enhances soil health and reduces fertilizer input without compromising crop yield.
Area Of Science
- Agricultural Science
- Soil Science
- Agronomy
Background
- Potassium (K) is crucial for tobacco production in Shandong, China, where soil K deficiency limits yield and quality.
- Potassium sulfate (K<sub>2</sub>SO<sub>4</sub>) is widely used by farmers, but its long-term effects on soil and tobacco are not fully understood.
- Understanding the optimal K<sub>2</sub>SO<sub>4</sub> application is vital for sustainable agriculture and maximizing crop potential.
Purpose Of The Study
- To determine the optimal application rate of K<sub>2</sub>SO<sub>4</sub> fertilizer for improving soil health.
- To enhance tobacco leaf potassium content without negatively impacting yield.
- To investigate the long-term effects of K<sub>2</sub>SO<sub>4</sub> on soil physicochemical properties and tobacco growth.
Main Methods
- Field experiment with four treatments: K<sub>82.5</sub> + S<sub>66</sub>, K<sub>165</sub> + S<sub>95.7</sub>, K<sub>247.5</sub> + S<sub>125.4</sub>, and a control (CK) over 10 years.
- Monitoring of soil physicochemical characteristics (pH, available potassium - AK, arylsulfatase activity).
- Analysis of potassium (K) content in tobacco plant tissues (roots, stems, leaves) and total dry matter.
Main Results
- Excessive K<sub>2</sub>SO<sub>4</sub> application led to soil acidification and decreased arylsulfatase activity.
- Soil AK and pH showed varied responses; AK increased, while pH decreased with higher K<sub>2</sub>SO<sub>4</sub> application.
- Tobacco K content significantly increased, especially in leaves, with positive correlations between soil AK and plant K content; soil pH was a pivotal factor.
Conclusions
- The application rate of K<sub>165</sub> + S<sub>95.7</sub> was identified as optimal, balancing soil health, tobacco K content, and economic efficiency.
- This rate improved soil health and tobacco leaf K content while reducing fertilizer input and avoiding yield loss.
- Soil pH significantly influences soil properties, dry matter accumulation, and tobacco K uptake, highlighting its importance in fertilizer management.
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