Hello,
This year we tested a growing method directly from a bag of potting soil, and the results are excellent. The application of fertilizer urine is 100% concentrated in the soil, eliminating the risk of foliar residue. According to the WHO, this method is 100 to 1 million times safer.

In addition, this method is very fast, clean, and inexpensive for demonstrations or comparative trials.

For our tests, we apply 40 ml of urine twice a month, diluted in the bottles or applied in the cone. The lettuces are delicious and risk-free.

Cuttings are quite easy to grow in the bag with controled moisture. 

The Solar-Dripper is available on solar-dripper.com, and you can contact me if you are working with bio-fertilizers or uro-fertilizers.

Robert Cossette

solar-dripper.com/en/how-to-use-urine-fertilizer/
solar-dripper.com/en/drip-irrigation-efficiency/