1. Can sulfur-based or chlorine-based fertilizers be used for lotus root cultivation?
2. Is it necessary to use potassium sulfate compound fertilizer as a base fertilizer for cotton? Can urea be applied on the surface and rely on rain?
3. When applying basal fertilizer for cotton, can rapeseed cake be mixed with urea?
4. A fertilizer bag labeled for the northern region with a 19-19-19 formula is available. Can it be used as a one-time application?
5. Can chemical fertilizers be dissolved in water for longan and lychee trees? Mix Bed Resin,Mixed Bed Ion Exchange Resin,Edm Resin,Mixed Bed Resin,Wire Edm Resin Henan Comcess Industry Co., Ltd. , https://www.comcessresins.com
A: From a potassium nutrition perspective, both sulfur-based and chlorine-based compound fertilizers can technically be used for lotus roots. However, lotus roots are typically grown in flooded conditions. Under these reducing conditions, sulfur-based fertilizers may release hydrogen sulfide, which can negatively affect the root system. Therefore, it is generally recommended to avoid sulfur-based fertilizers for lotus root crops.
A: Cotton has strong tolerance to chloride, 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 occurs, it may lead to ammonia volatilization after dissolving, reducing its effectiveness. It's better to incorporate urea into the soil for better nutrient retention.
A: After fermentation, rapeseed cake becomes a high-quality organic fertilizer with a high nitrogen content and rich nutrients. Urea is a neutral nitrogen fertilizer containing 46% nitrogen. Mixing them together will not cause any negative effects and can even enhance soil fertility.
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 type rather than ordinary urea. Otherwise, using it as a single application may lead to nutrient leaching or insufficient supply during the growing season.
A: Fertilizers designed for vegetables are usually fully water-soluble, high in nitrogen and potassium. However, standard compound fertilizers like Sinofert are not necessarily fully soluble in water. Using them for irrigation (flushing) may not be effective and could potentially harm the tree roots. It's better to apply them directly to the soil or mix with water carefully.
Fertilizer expert question and answer
Fertilizer Expert Q&A