Fertilizer expert question and answer

1. Can sulfur-based or chlorine-based fertilizers be used for lotus roots? A: From a potassium nutrition perspective, both sulfur-based and chlorine-based compound fertilizers can be applied to lotus roots. However, lotus roots are typically grown in flooded conditions. Under such reducing environments, sulfur-based fertilizers may release hydrogen sulfide, which can negatively affect the root system. Therefore, it's advisable to avoid sulfur-based fertilizers in this context.

2. Is it necessary to use potassium sulfate compound fertilizer as a base fertilizer for cotton, or can urea be applied on the surface and rely on rain? A: Cotton has strong tolerance to chlorine, so potassium chloride-based compound fertilizers can be used instead of potassium sulfate, which is more expensive. If urea is applied on the surface and no rain follows, it may lead to ammonia volatilization after dissolving, reducing its effectiveness. It’s better to incorporate urea into the soil for better performance.

3. When applying basal fertilizer for cotton, can rapeseed cake be mixed with urea? A: After fermentation, rapeseed cake becomes a high-quality organic fertilizer rich in nitrogen and various nutrients. Urea is a neutral nitrogen fertilizer containing 46% nitrogen. Mixing them together is safe and will not cause any negative effects.

4. A fertilizer with 19-19-19 content is labeled for northern regions and intended for one-time application. Is it suitable for use? A: In principle, a 19-19-19 compound fertilizer can be used as a base fertilizer without top-dressing if the urea in it is controlled-release urea rather than regular urea. Otherwise, using it all at once might lead to nutrient imbalance or leaching issues.

5. Can chemical fertilizers be dissolved in water for longan and lychee trees? A: Fertilizers designed for vegetables are usually fully water-soluble and high in nitrogen and potassium. However, standard compound fertilizers like Sinofert may not dissolve completely in water, making them unsuitable for foliar or drip irrigation. It’s better to use specialized liquid fertilizers for fruit trees.

In summary, choosing the right fertilizer depends on the crop type, soil conditions, and application method. Always consider the specific needs of your plants and follow recommended practices to maximize efficiency and minimize environmental impact.

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