Sorry I made spelling mistake. I was going to say JHS (JADAM Herb Soultion). You can use it as same amount of ginkgo JHS. But if you think it is not working properly, you can increase the amount of bracken JHS.

If you click the link below, you can see tthe pictures of bracken.
https://www.google.co.kr/search?q=bracken&client=ms-android-lge&prmd=inv&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiUw5jfoufbAhUMerwKHeIdCncQ_AUIESgB&biw=412&bih=761  

Thank you, sir, for your answer, but what is bracken JLF ? (I assume we are talking about JNP N 8, not JNP N10)

1. JADAM Liquid Fertiliser JLF - is it the same as JADAM Microorganism Solution JMS?
2. And what is bracken? Is it a bracken fern, pteridium aquilinum?
3. If it is so, the proportion would be the same as for ginkgo -15L bracken per 500 L water?  

Hello, sorry for late reply. You can use bracken JLF instead of Ginkgo JLF. Thank you