Role of Foliar Sprays in Mulberry Growth
Foliar application of essential nutrients plays a significant role in improving vegetative growth parameters in mulberry. Nutrients such as nitrogen, potassium, zinc, iron, and boron, when applied as foliar sprays, promote cell division, elongation, and metabolic activities. This results in increased plant height, number of shoots, leaf area, and overall biomass production [2]. Nitrogen-based foliar sprays enhance vegetative growth by promoting protein synthesis and chlorophyll formation. Potassium contributes to enzyme activation and regulation of stomatal function, thereby improving photosynthesis efficiency. Micronutrients such as zinc and iron are essential for enzymatic activities and chlorophyll biosynthesis, which directly influence plant vigor.

Impact on Biochemical Parameters
Foliar nutrition significantly influences the biochemical composition of mulberry leaves, which is critical for silkworm nutrition. Application of nutrient sprays has been shown to increase chlorophyll content, thereby enhancing photosynthetic capacity. This leads to higher accumulation of carbohydrates and soluble sugars in the leaves. Protein content is another important parameter that improves with foliar feeding, as nitrogen and other nutrients facilitate amino acid synthesis [3]. Additionally, foliar sprays enhance the activity of antioxidant enzymes, which help in protecting plants from oxidative stress. Improved biochemical composition results in higher-quality leaves that support better silkworm growth and cocoon production.

Advantages of Foliar Nutrition
Foliar feeding offers several advantages over conventional soil fertilization:

• Rapid nutrient absorption and immediate response
• Reduced nutrient losses due to leaching and fixation
• Targeted nutrient application during critical growth stages
• Improved nutrient use efficiency
• Environmentally sustainable and cost-effective

These benefits make foliar nutrition a practical approach for enhancing mulberry cultivation, especially in regions with poor soil fertility.

Implications for Sericulture
Improved growth and biochemical quality of mulberry leaves have a direct positive impact on sericulture. High-quality leaves enhance silkworm feeding efficiency, growth rate, and cocoon quality [4-5]. This ultimately leads to increased silk yield and better economic returns for farmers.

Conclusion
The application of selected foliar sprays plays a vital role in improving the growth and biochemical parameters of mulberry. And ensuring efficient nutrient uptake and enhancing physiological processes, foliar nutrition contributes to better leaf yield and quality. Adoption of this technique can significantly support sustainable mulberry production and strengthen the sericulture industry. Future research should focus on optimizing spray formulations, concentrations, and application schedules for maximum benefit.

References

1. Li, J., Ackah, M., Amoako, F. K., Cui, Z., Sun, L., Li, H., … & Zhao, W. (2024). Metabolomics and physio-chemical analyses of mulberry plants leaves response to manganese deficiency and toxicity reveal key metabolites and their pathways in manganese tolerance. Frontiers in plant science, 15, 1349456.
2. Geng, B., Gao, J., Cheng, H., Guo, G., & Wang, Z. (2024). Effects of dietary mulberry leaves on growth, production performance, gut microbiota, and immunological parameters in poultry and livestock: a systematic review and meta-analysis. Animal Bioscience, 37(6), 1065.
3. Yan, Cheng‐Hai, Fang‐Hui Chen, Yu‐Lu Yang, Li‐Wei Shen, Xiao‐Meng Xun, Zhi‐Ang Zhang, Yu‐Fan Zhan, Shuai You, and Jun Wang. “Biochemical and protein nutritional potential of mulberry (Morus alba L.) leaf: partial substitution improves the nutrition of conventional protein.” Journal of the Science of Food and Agriculture 104, no. 4 (2024): 2204-2214.
4. Alfazairy, A. A., Elsakhawy, D. A., El-Meniawi, F. A., Hashem, M., & Rawash, I. A. (2024). Effects of mulberry leaf enrichment with Lepidium sativum L. seed powder suspension on the economic parameters of Bombyx mori L. Scientific Reports, 14(1), 19600.
5. Wang, X., Li, G., Liu, Y., Yang, Y., Wang, C., Gong, S., … & He, D. (2024). Optimization strategies for mulberry leaf powder supplementation in Zhedong White Geese diets: an analysis of growth performance and meat quality. Cogent Food & Agriculture, 10(1), 2366393.