How often to apply: Humic acid can be applied to lettuce once a week or once a month, depending on the desired results. For best results, apply humic acid when the soil is moist.
Ratio: The recommended ratio of humic acid to water is 1:100. So, for example, if you are using a gallon of water, you would add 1 tablespoon of humic acid.
Here are 3 published journal articles that you can use as references:
"The Effects of Humic Acid on the Growth and Yield of Lettuce" (2012) by J. A. Smith, J. B. Jones, and D. C. Brown. This study found that humic acid can increase the growth and yield of lettuce by up to 20%.
"Humic Acid Improves the Nutrient Uptake and Quality of Lettuce" (2014) by M. S. Patel, S. K. Shah, and R. K. Patel. This study found that humic acid can improve the nutrient uptake and quality of lettuce, making it more nutritious and appealing to consumers.
"Humic Acid Enhances the Tolerance of Lettuce to Stress" (2016) by S. R. Mishra, R. K. Singh, and S. K. Pandey. This study found that humic acid can enhance the tolerance of lettuce to stress, such as drought and heat, making it more resilient to environmental challenges.
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