Not yet. Let her dry back an extra day. If you're using your finger as a monitor it should feel slightly damp and your finger should come out clean. If this is the case then go ahead and water. These plants don't like the soil very wet as constantly wet soil tends to drown the roots or promote root rot. Dry back periods also promote root development as the drier soil pushes the plant to look for new water sources to draw from. I guess the best way to describe it is to measure the dampness and when you think it's dry enough wait an extra day or wait for the leaves to start wilting. I don't like to wait that long as I feel wilting leaves stresses the plant and stunts growth but that's just personal preference rather than scientific fact.
The fact that the plant has straightened up tells me it's already recovered and is now transitioning from stressed to normal feeding routine. Keep an eye on how fast it takes for the soil to dry back after your next feeding and the speed in which it dries should tell you what stage your plant is in.
For light meter you can download tent buddy. The app will measure your LUX and convert it to PPFD so that you can get an approximate reading on how much light is hitting the canopy. You can adjust your lighting intensity accordingly. The app also has a VPD and DLI conversion so that you can measure the daily light integral your plants are receiving along with VPD readings to make sure your environment is where you want it for that stage of growth.
From the last picture I saw, your plant is well beyond the cotyledon stage. It's root structure looks firmly on track and is taking up the naturally occurring nutrient ions that are currently in the soil. FFOF
is usually good for around 4 -6 weeks of water only nutrition then you're going to start running into deficiency issues due to low ion count in the soil. Do you have a preferred nutrient regime you want to follow? Liquid salt based? Powdered? I prefer liquid because I can steer the plant easier and resolve nutrient issues faster but many like the convenience of not having to mix up a solution for every feed and only have to clean water the plants. @Shaded_One
consistently grow beautiful plants using this method. Check out what they've done and decide the feed method you want to employ.
How do you know the pH of the water if you don't have a meter to measure it? I've used cheap Ebay and Amazon meters with ok results but they usually don't stay accurate for very long. I like to use a brand called Blue Lab for meters. I have a pH and EC/PPM meter. They're not cheap but they are very accurate and very reliable as long as you maintain them properly. If you decide to go this route I would go with the Growers Toolbox. It has pretty much everything you'll need to keep your meters in good shape. There are other good meters out there also, I just prefer Blue Lab since I've used them throughout much of my time working in the cannabis industry.
I would try and keep my pH a little higher than the usual 6.0 pH. 5.8 - 6.2 is usually reserved for hydroponic grows in synthetic media. Soil tends to like pH around 6.5 - 6.8. The beauty of soil is that even if the pH is a bit off it will compensate as much as the soil allows it to.
More charts to confuse you even further......
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