Ramsey Nubani - Crop Steering 101 - Three phases of irrigation
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- Опубликовано: 10 фев 2025
- Explanation of the three phases of irrigation in crop steering.
Originally by Ramsay Nubani on: / ck9qb7bh9czrmufzivyhcw...
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This was the info I needed. This really important for weeks 4 and 5 of flowering I found they really need to be doing full dry back by then. I reduced pot size slightly for my setup give me the dry backs I needed.
I tried to watch other videos and couldn’t get through the first minute. Thank you for getting straight to the point.
Awesome job, that is the best explanation I have heard on the subject
Bruh, definitely the best explanation I found on this. Appreciate it!! Could we get a more in depth vid on what exactly is going on in each phase like how to figure out how much per shot??
Rule of thumb from rockwool is each irrigation volume, called a "shot", is 3% of substrate volume for vegetative & 6% for generative. For flowering, called "generative" double the time between shots and start the irrigation cycle 2-3 hours after lights on and stop 2-3 hours before lights off to promote greater dry back and drive EC up.
@@kurt5490 thanks for the info brother. what’s the best way to get the substrate volume? With a brand new cube should I just measure how much water(ml) it can hold or should I soak it first then let it dry due to salt channels before I measure to full to saturation?
@@Htown_Rocket90 For rockwool you're using the entire volume of the cube to determine shot size. Ramsey suggests using field capacity as a starting point for all other media.
A pdf that really helped me is found at www.netafimusa.com. Use their search for Precision Rockwool Applications.pdf. On the pdf's 2nd page. There is a list of most of grodan's rockwool sizes and lists their 3% shot volume in milliliters. There are also 3 short paragraphs that give general guidelines for using rockwool. They contradict some of Ramseys points he makes in other videos. Ramsey uses math to determine shot size to achieve a certain level of saturation during lights on. But increasing shot size during vegetative growth may nullify any crop steering thru precision irrigation. Increase the # of shots , not shot size. Increased shot size is for generative growth.
Until proven by experience, I'll use the pdf instead of Ramsey's suggestions. Perhaps I didn't hear him say one or the other. He's a smarter, more experienced man than I am, but I'll reserve final judgment for myself.
I hope this helps and answers your questions.
Kurt
Dude! You're doing God's work!!..do more!
Amazing info professor 👌
Please keep adding more to this page!
I can see this catching on. It's basically like teaching a computer what most experienced growers already do. They just don't know they've been doing it.
I feel like my input EC is lower than it could be given my environmental conditions, but my runoff EC is very high. Is that because I'm just doing P1 & P3? I'm getting at least 20% runoff 95% of the time when I'm watering, but my understanding of dry backs was wrong, so once a week I just didn't water them, thinking that it was like drought stress, but I think maybe not feeding them that one time per week might be increasing my medium's EC.
This was a really great introductory video on crop steering. Thank you!!!!!
I have some plants that overdry in 6x6 advanced grodans with drip feed. I have to give a 30 second shot every hour during lights off to slow the dryback so i dont over dry and wipe out the roots. Any ideas how i can fix that? plants are to big to be in the cubes for sure but theyre in week 3 so no choice at this point. im seeing about a 6 percent dryback per hour even at night. Field capacity in blocks is 52-55%. Theyll dry down to 10 overnight if i dont irrigate and all roots will tan out and air prune. Any fix other then slowing dryback with tiny nighttime shots. The 30 second shots dont even raise the sensor value at all. Is that safe to get thru the run like this? Thanks for any help
How long to wait from P1 to P2? For veg and gen? Thanks
I'm a newbie and i find it hard to understand. Can you please explain it in week 123456 and so on and what to do in that week.
In a previous video, you talked about shot size( maintenance shots) for a two gallon coco medium. I'm trying to get an idea of shot size for 6x6 Hugo blocks. Any info would help. Thanks for such informative videos!
The recommended shot size for Hugo blocks is 3% of its volume = 100 ml / shot. In case you want to lower the EC quickly you should raise the volume to 200 ml per shot.
@@benn1555 100 ml.. is that right? if my math is right then that would take about 33 irrigation to get to saturation point and i dont think anybody is feeding 33 times lol
@@tee228 The Hugo block is 3.2L (100% water content) 15cmx15cmx14.2 (6x6inch). When you initially saturate the block by submerging it has to weight around 2.7-2.8 kg which is around 80% of full capacity water content (80% of 3.2L). during cultivation you work between minimum water content 40% maximum 65-70%. Example in the morning water content 50% equal to 1.6kg (theory) in reality is 50%of 80% 1.4 kg, but Grodan make calculation based on 100%. so 50% WC equal 1.6L you want to increase to maximum capacity 70% (it will drain at this level or even before) than need to add 20% to reach this level . 20% of 3.2 L is 640 ml, so in order to get drain you need to give either 3 irrigation x 200 ml or 6 irrigation of 100 ml. Same result. Once again to reach drain level (no saturation), you need 3-6 irrigation in general. Hope is clear.
@@benn1555 thanks for the detailed reply 👍🏼 ill need to read it a few times to truly understand lol also what would be a reason to want to lower the EC as u mentioned before?
@@benn1555 hey man, usually what is the dry backs before the first irrigation? i watch that Ramsey said its half of the field capacity is that correct? I mean from the last irrigation to the first, my media weights should be in half?
NO IRRIGATION WITHOUT TRANSPIRATION
What is your shot size? We use the Floraflex micro drip with 4” rockwool stacked on a 1 gallon coco bag. How big should that p1 event be?
Shot size for Vegetative 1-3% and Generative 4-6%.
The dry-back between shots for P1 in Vegetative 1% and Generative 2-3%. In P2 Vegetative 1-3% and Generative 3-6% .
Thank you very much for explanation. What does dry back 2-4% mean exactly? 2-4% of what?
2-4% of the water volume content during the "dry back' of the substrate. This is best displayed using substrate sensors that deliver the info in a graph form on a phone/tablet/monitor.
thank you!!
What period do you want to achieve runoff? At the end of P1 or sometime in P2?
always at the end of P1
How do you calculate substrate E.C if you dont water enough to produce runoff ?
Soil sensor or a bit runoff just to measure. Runoff is not a problem. The main goal is target the dry-back.
legend
Sub#4🙌😎🥃
Why don’t you reference the creators of the video?
All references are in the description.
I assume this is hydro.
It works for any medium as long as you can tell the moisture content every hour to 30 minutes or so
He said pay me back for the free information I give you.so do they have to pay or is it free😂
Very nice content, if you want to go one step further of this contact Gremon Systems, you can ask for me (Miguel) and I will be very glad to explain you how do we help growers with their irrigation strategy