Note: This is the second part of the blog series, which outlines the practical experience of cannabis cultivation. Read Part 1 (BEST PRACTICES FOR MONITORING PH FOR CANNABIS) here to learn more about pH testing and fertilization strategies.
After prolonged fertilization or over-feeding at too high a concentration, too high a concentration of nutrients can cause dehydration of plant cells, because the liquid will be transferred from a place with a low concentration to a place with a high concentration.
Electrical conductivity (EC) is an important concept that needs to be remembered. The electrical conductivity of a nutrient solution is related to the concentration of its solute salt. Generally, the back irrigation method (described below) is used to regularly measure the EC and PH values of the root zone of the plant, which will help you improve your fertilization strategy.
Steps 1-5 of the backflow method
- Randomly pick a few plants from the growing area, add irrigation, and then wait for 30-45 so that the solution can be homogenized throughout the process.
- Add water to the soil, put a collection dish in the bottom of the pot, add 200ML-500ML of distilled water according to the size of the flower pot to soak the entire soil
- Collect the leachate in the dish at the bottom of the basin. Normally, transfer the collected liquid of 50ML-100ML into a cup deep enough to submerge the probe of the PH/EC instrument
- Measure the collected liquid with a calibrated PH/EC instrument, which can improve the fertilization strategy based on the measurement results
- Record: Make sure to record the seepage test and fertilizer EC. Entering data into a spreadsheet can keep generating graphs of results. This information can help to better understand your plant needs, the results of your experiments that you choose, and how to compare them to each other.
Read Part 3:The best spectrum for cannabis