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General discussion regarding the techniques and methods used to successfully grow tomato plants in containers.

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Old April 16, 2021   #37
Join Date: May 2019
Location: Seattle
Posts: 58

Originally Posted by zipcode View Post
Do overwatering not at every watering then, and dose the fertilizer according with the runoff EC when you do overwater. It's really the root zone EC that matters mostly, and runoff EC will be a good aproximation. More frequent flushing will give a more stable nutrient solution (especially in terms of nutrient balance), there's a reason they grow in rockwool in top greenhouses. Also, as long as aeration is high (coarse peat is especially important, not sure what promix has), you can have high water retention, the roots don't rot from water but from lack of oxygen.
I'll give it a try, I've never actually watered to waste and captured the runoff to measure the EC before. I use ProMix HP, and don't add any additional components. I find water retention is still extremely high, at least in the PNW.
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