Easy Oven Pasteurization


This is part of my Easy Series



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Here is an easy pasteurization method. This method is simple and works like a charm. The method is slightly different to a water bath pasteurization. You add water to field capacity, load it in the turkey tin and allow the oven to do all the work.

The method tried and tested. Personally, when I first logged into the OMC around 1996 this was a standard pasteurization method. Somehow it has been lost over the years.

I've used this method for 15 plus years with consistent grows all year round. If your talking about consistency, once you dial in your stove, this is by far the easiest pasteurization method out there. After initial stove dial in, you won't need to monitor anything. You set the temp on the stove and the timer and let it be. Let it cool then spawn. Easy as 123.

I feel this is a fail safe way to pasteurize for even the easiest beginner. This method works with coco fiber, vermiculite, strawnet, horse dung, compost, cow dung, donkey dung and pelleted straw.

Wives complain about odd smells in the oven. Don't worry, as long as your dung is dry and field aged. The smell will not be noticeable. The mess is also minimal bc your using a mixing box to mix your substrate. you just rinse out the box when your done.


Materials:

• a turkey tin from walmart or grocery store. they hold 11 quarts tightly packed into each tin.
  
  
  
  
  
• some medium grade foil
  
  
• your substrate and some water
  
  
• a sterilite plastic bin for mixing or anything you can use to mix in. a big bucket
  

These turkey tins can fit exactly 11 quarts volume of substrate packed in tight. Each tin is the perfect volume for one 56 or 66 quart tote or monotub. So you can actually fit 5 tins per oven pasteurization session. So in one day you can make enough substrate for 15 tubs if you do 3 rounds in one day.


Instructions



1) Preheat oven to 170.  Lowest setting on my oven is 170. Ovens may vary so you have to test the oven temps the first run to dial your oven in. This involves using a thermometer to gauge inner substrate temperature. You want to bring the inner core temperature to 170 for. You then cook the substrate at that temperature for 2 hours.

2)  Place a pot of water on high heat for 6-10 minutes to bring the temperature up to expand your coco fiber brick. Personally, I use 5 quarts of water to 1 small brick coir and 2 quarts vermiculite.(Substrate recipes and water volume may vary dependent upon which substrate recipe you use) I place the brick in the bottom of the bucket, pour the hot water over it, then place the lid on the bucket for about 10 minutes. When you come back, the bricks will be expanded.  take your big bucket and mix up your substrate to field capacity.


Expanding coir with hot water

Quote:

bricks of coir like this


mixing box is this exact sterilite.


my tubs are 66 quart like this.


I fill a big metal pot with water about half full. Put it on high heat for 6-10 minutes. I then pour it over the coir brick about halfway up the height of the brick. I put the lid on the box and let it sit 10 minutes to expand.

here is a picture sequence. this is coir with hot water. its expanded. then i put the strawnet in. add more warm water to expand that. then mix it all up.

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3) Once you achieve "field capacity" moisture content. stick your sub into the turkey tin. you can compress it as much as you like to fit more subs into the tin. each tin will fit 11 quarts substrate packed down. this is enough for 1 tub if your using 5 quarts of spawn per tub.  I actually use these turkey tins as my measuring volume for substrates. I know that one of them fill one tub to 2.5" substrate depth. Substrate depth may vary depending on the size or shape of your fruiting chamber. Now, the standard oven will fit 4-5 turkey tins stacked on top of each other. you may have to pull the metal racks out and leave the bottom rack in place to stack them that high. either way. you can do 5-15 tubs a day with this if you have 10 tins(5 cook while 5 are full, when you spawn you put the other 5 in the oven). if you want a rotation. get 10 turkey tins. when the first 5 are done. you can easily take those out to cool. then put in your 5 newly mixed subs into the oven for another pasteurization. then when you take those out, you spawn the 2nd batch and prepare your 3rd.  allowing you to total 15 bins per non work day at spawning.

For personal use this works well for 4-5 tubs spawned per session.  You can do 15 tubs in one day using this method.

4) Cover the turkey tin in foil. USING A TURKEY THERMOMETER MEASURE HOW LONG IT TAKES YOU OVEN TO BRING THE INNER CORE TEMP OF THE SUBSTRATE TO 140-170. MY OVEN TAKES 30 MINUTES TO GET TO THIS TEMP. YOURS MAY VARY. MAKE SURE TO RECORD THE INITIAL TIME IT TAKES YOUR OVEN TO GET YOUR INNER CORE SUBSTRATE TEMP TO 140-170.  RECORD THE TIME IT TAKES TO GET SUBSTRATE TEMPS AND REPEAT THIS OVER AND OVER. YOU WILL THEN COOK THE SUBSTRATE AT THIS TEMPERATURE FOR 1 HOUR. then keep your tin in the oven for 2 hours at that temp. the 30 mins extra is to account for allowing the substrate inner temp to get to pasteurization temps. once that happens. then you want to pasteurize for 2 hours.
You can take the route of getting a turkey thermometer and measuring the inner temperature to see how long it takes your oven to reach the 140-170 mark.

(NOTE: Everyone's oven is different but any gas or electric oven will work. You will have to do a trial test run to see how long your oven takes to get the inner substrate temperature to 140-170 degrees. You can use a turkey thermometer to measure the temp. Record this time.  keep the inner core temperature of the substrate at this range for 1 hour) You can then repeat this time frame over and over again with consistent results. But if you happen to move to a new place with a new oven, you will then have to do a first trial test run on the new oven to find out how long it takes the inner substrate to reach optimal temperature. I am not going to debate whether 140-170 is the proper pasteurization temperature. this has been a hot topic longer than most of you have been on the OMC. If your comfortable with 140 for an hour. Adopt the 140 for an hour range to what i have listed in this thread.

After you find that time(my oven takes 30 minutes)you won't need to use the thermometer anymore. You can simply turn your oven on, put the tin with mixed subs in, then set the timer. For me this is 1.5 hours start to finish and I don't have to pay any attention or monitor the tins.

Then once inner temps are reached, keep the tins in for 2 hours at this temperature. I criss cross stack the tins on top of each other.



5) once the 2.5 hours is up. allow your subs to cool. You can leave the tins in the oven to cool and spawn in the morning. Or take your turkey tin out to your clean area for spawning for cooling.

6. take your cool tins to the spawning area.

when its all mixed in and in the tins and cooled.


mixed into my tubs after it has pasteurized and cooled.

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Haters gonna hate and talk shit. So let the results speak for themselves. Not word from people trying to get notoriety for their own shortcomings.

Over the years I've tested this method(so have many others) on 4 different ovens with consistent results, but if you need reassurance then please do more work and use a thermometer.

Some winy kids in this thread seem to want to argue about shenanigans. The results below speak for themselves. One guy mentioned it didn't work for him. Maybe he didn't do it properly. Below you will see 15 years of consistent results with year round grows including the hot summertime blues. A few failed tubs from amateur trash talkers prove absolutely nothing but heresay. I'll take my 15 years of documented consistent results over what "this guy says didn't work for him the one time he tried it" anyday.

And just to be clear here is a small sample of results. This pasteurization method has been used on every grow for the last 15 years. These grows shown are from 2001-current year. Substrates vary in range from worm castings/verm/straw, donkey poo, hpoo, strawnet, pelleted straw, cvg, cofee/verm/coir and many others. they all work just fine.

















This is a burma clone from the same 2009 genetics you see above. it was printed and grown out non cased. then cloned and fruited. all done with dung using oven pasteurization.


All AA+ Tubs below have dung in them. How can anyone argue that dung doesn't work using this method? AA+ says it does. Amateur futile attempts at bulk prove nothing, 15 years of documented bulk dung substrates do. When one learns to properly prepare substrates I think that issue will be clarified that its not the method but a user error.








WANT TO SEE MORE CONSISTENT RESULTS? HIGHROLLER FUNGAL ARTS METHOD


READ THE FIRST PARAGRAPH.

blindingleaf said:

nice eat!!  would u say there is any difference btw gas and electric stoves in terms of timing and/or temperature?

carcade, straw in stock pot is easy dude!!  chop straw, put in pot, bring to 150-160, maintain that for an hour, dump, steam off excess, spawn.  i don't even use a bag when i do it, just loose straw in the same pot i soak grains in.  the RR way is good too if u need a lot of straw.

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blindingleaf said:

carcade, straw in stock pot is easy dude!!  chop straw, put in pot, bring to 150-160, maintain that for an hour, dump, steam off excess, spawn.  i don't even use a bag when i do it, just loose straw in the same pot i soak grains in.  the RR way is good too if u need a lot of straw.

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cArcace-x said:

blindingleaf said:

carcade, straw in stock pot is easy dude!!  chop straw, put in pot, bring to 150-160, maintain that for an hour, dump, steam off excess, spawn.  i don't even use a bag when i do it, just loose straw in the same pot i soak grains in.  the RR way is good too if u need a lot of straw.

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yeah lol, my last 2 batch in a pillow case is good tho, its pinning in the greenhouse at the moment
tried some coffee once but it contaminate

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cArcace-x said:

i used maybe just like 1/4 of a qt jar for 3qt of staw/coir/gypsum
but it was before the 2 other batch of straw worked

the oven tek wont make me lazy, i'll work to learn the ways of proper pasteurisation in water and steam..
but i wanna try poo now and the oven seems an easy way

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eatyualive said:

straw + coffee isnt the best combo both are a little more prone to trich. i like my straw very fine textured no pieces bigger than 1/2 inch and almost pulverized. you really have to colonize this sub lightning fast. id stick with small amounts of coffee as an additive to a sub without any straw in it.

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ok got it!

eatyualive said:

i stopped using straw long ago bc i hate cutting it lol.. i used to have access to pelletized straw which is very helpful. ive heard southern states has it as horse bedding. ive broken numerous blenders, weed wackers and scissors trying to process bales. i made a promise to myself never to chop it again. you could mulch it in a wood mulcher but when i was working w straw i had no money or room for that. also being in college at the time, it was not an option.

http://www.southernstates.com/catalog/p-5840-streufex-horse-bedding-pellets-30lb.aspx

ill always pay extra so i dont have to process straw.

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cArcace-x said:

i love this idea...
http://www.shroomery.org/forums/showflat.php/Number/20567520#20567520

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