I normally make my potting soil as below and it has given good results throughout.
1/3 coir 1/3 yard compost and 1/3 garden soils or soil and sand mixed equally. I also heat soil to 60 deg C for about 20 minutes to kill unwanted Organics including seeds to sterilise. It is also advised to sterilise the vermicompost as above, if it is from unknown source. Also it is better to wash the coir 2 or 3 times to remove its acidic nature and dry it well. I also add a dash of oil cakes of neem, peanut and sesame seeds. Adding phospho-bacterium and Trichoderma viride helps in providing microbes and fungal resistance to saplings/seeds. Hope this helps.
I normally make my potting soil as below and it has given good results throughout.
1/3 coir 1/3 yard compost and 1/3 garden soils or soil and sand mixed equally. I also heat soil to 60 deg C for about 20 minutes to kill unwanted Organics including seeds to sterilise. It is also advised to sterilise the vermicompost as above, if it is from unknown source. Also it is better to wash the coir 2 or 3 times to remove its acidic nature and dry it well. I also add a dash of oil cakes of neem, peanut and sesame seeds. Adding phospho-bacterium and Trichoderma viride helps in providing microbes and fungal resistance to saplings/seeds. Hope this helps.