Ramsey Nubani - Crop Steering 101 - Three phases of irrigation

Explanation of the three phases of irrigation in crop steering.
Originally by Ramsay Nubani on: / ck9qb7bh9czrmufzivyhcw...
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[@robertdiaz1248]

I tried to watch other videos and couldn’t get through the first minute. Thank you for getting straight to the point.

[@patrey6797]

Awesome job, that is the best explanation I have heard on the subject

[@adida.sativa-dv2el]

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.

[@icculus7989]

Dude! You're doing God's work!!..do more!

[@Htown_Rocket90]

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??

[@kurt5490]

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.

[@Htown_Rocket90]

@@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?

[@kurt5490]

@@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

[@jasontran4525]

Amazing info professor 👌 Please keep adding more to this page!

[@t.properties6878]

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.

[@everennui1]

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!!!!!

[@LarsLarsen77]

NO IRRIGATION WITHOUT TRANSPIRATION

[@ameerulaqmalmalek9470]

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.

[@jimd1617]

thank you!!

[@itswayne419]

legend

[@toki8199]

Sub#4🙌😎🥃

[@patrey6797]

What period do you want to achieve runoff? At the end of P1 or sometime in P2?

[@benn1555]

always at the end of P1

[@bbnn7271]

Thank you very much for explanation. What does dry back 2-4% mean exactly? 2-4% of what?

[@jaradratcliff8652]

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.

[@grateful1185]

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!

[@benn1555]

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.

[@tee228]

@@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

[@benn1555]

@@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.

[@tee228]

@@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?

[@batabaka]

@@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?

[@bobgrowsbud2003]

How do you calculate substrate E.C if you dont water enough to produce runoff ?

[@philsmith6784]

Soil sensor or a bit runoff just to measure. Runoff is not a problem. The main goal is target the dry-back.

[@derekesposito6586]

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?

[@kromalabs]

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% .

[@fragelicious]

I assume this is hydro.

[@EAster33]

It works for any medium as long as you can tell the moisture content every hour to 30 minutes or so

[@christianhertel2799]

Why don’t you reference the creators of the video?

[@kromalabs]

All references are in the description.

[@420.teatime3]

He said pay me back for the free information I give you.so do they have to pay or is it free😂

[@miguelangelcuevasrodriguez1531]

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