Foliar fertilization is a popular technique used in the cultivation of Chinese herbal medicines, where nutrients are dissolved in water and sprayed directly onto the plant's leaves. This method is favored for its simplicity, cost-effectiveness, and rapid absorption, which can significantly enhance both the yield and quality of medicinal crops. However, given that these plants directly affect human health, it's crucial to choose fertilizers carefully. Organic and bio-fertilizers are generally preferred, as they are safer and more sustainable.
Among the best options is algae-based biological fertilizer. Seaweed-based fertilizers are considered some of the most advanced in the world today. They offer unique advantages over chemical fertilizers, such as improved stress resistance, natural activity, non-toxicity, and no environmental pollution. Jinbao algae biological bacteria fertilizer, for example, is imported from Australia and produced using cutting-edge microbiological engineering technology. It contains a high concentration of beneficial microorganisms that help decompose organic matter, activate soil, fix nitrogen, and release phosphorus and potassium. This makes it an ideal choice for producing high-quality Chinese medicinal herbs.
When it comes to selecting the right type of foliar fertilizer, different herbal plants require different formulations. For root and rhizome crops like Salvia miltiorrhiza, Atractylodes macrocephala, Fuzi, and Pinellia, foliar sprays rich in phosphorus and potassium are most effective. Solutions such as 0.4% potassium dihydrogen phosphate or 2% superphosphate calcium leaching solution mixed with 4% turfgrass leaching solution are commonly used. These should be applied during the late growth stage for optimal results.
For fruit and seed crops like burdock and barley, a balanced mix of nitrogen, phosphorus, and potassium is recommended. A common formula includes 1% urea combined with 2% superphosphate leaching solution and 1% potassium sulfate. Alternatively, 0.2% to 0.3% potassium dihydrogen phosphate can be used. Spraying once or twice during the later growth stages usually yields good results.
For whole-plant and flowering herbs like mint, chrysanthemum, safflower, and saffron, foliar sprays of 1% to 2% urea are typically used. The application rate is around 50–60 kg per acre, and spraying should occur 1 to 3 times throughout the growing season.
When applying foliar fertilizers, several key considerations should be taken into account. First, the timing of application is important—fertilizer should be sprayed on sunny mornings, not on rainy days. If rain occurs within three hours of spraying, it’s best to reapply after a dry day but reduce the concentration slightly. Second, the fertilizer concentration must be appropriate; overly concentrated solutions can damage the plants and increase costs unnecessarily. Special attention should be given when using trace elements. Lastly, proper preparation is essential. For instance, when using phosphorus-containing fertilizers like superphosphate, it’s advisable to use only the supernatant after soaking for 24 hours to avoid clogging nozzles and ensure even distribution.
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