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3rd Edition, 2012Hank’s guide toStoring Wheat in CO2 Storing Grain For those who want to store wheat for several years thi...
Storing Wheat in CO2Preparation                                                                Get Dry IceYou will need:  ...
Storing Wheat in CO2Train your team                                  ·   The “Ice-Guy” shakes down the wheat to           ...
Storing Wheat in CO2Allow the wheat to bubble off CO2 asthe dry ice sublimates.                        Oxygen AbsorbersThe...
Storing Wheat in CO2                                               Drying wheat                                           ...
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How To Store Wheat


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How to store wheat for long-term food storage. Learn how you use dry ice to prevent weevil damage to your stored grain.
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How To Store Wheat

  1. 1. 3rd Edition, 2012Hank’s guide toStoring Wheat in CO2 Storing Grain For those who want to store wheat for several years this article provides some guidelines for successful wheat storage. The Big 3 Photo by HJE CC By-NC 2.0 However you store your wheat, you’ll need to do these three things: remove oxygen, maintain a low moisture level and protect it from insects and rodents. Low moisture level10% - Buy wheat with a low moisture level. i.e. 12.5%. Remove Oxygen Store it in dry containers the same day you receive it. Although removing oxygen is not essential, I recommend it. Here’s why. Check your containers to make sure they keep moisture out. Store in a dry cool place. Food deteriorates faster when oxygen is present. Without oxygen, food retains its flavour and tastes nicer, longer. Weevil eggs which are present in fresh wheat will hatch into an oxygenless Pest-Proof and weevil proof. Containers must be mice environment and die after hatching. Weevil Rats and mice gnaw through many containers will hatch then die. though plastic drums are a strong deterrent. Mice bite through vacuum-packed plastic with ease. Pack these into vermin-proof containers. Weevil photo by ken-ichi CC BY-NC-SA 2.0 Stored food is too expensive to feed to mice. Also, they might urinate, excrete or die on your Oxygen can be removed by vacuum food storage. Store it well. Get the containers packing. Alternatively, air can be replaced first, wheat second. with a harmless gas like nitrogen or CO2. Mouse photo by pshab Pshab CC BY-NC 2.0
  2. 2. Storing Wheat in CO2Preparation Get Dry IceYou will need: · Collect the Dry Ice within an hour of using it. Avoid keeping it for several hours before· Esky or polystyrene chilli-bin use.· 240 Space-Saver containers & lids · Get an Esky or polystyrene chilli-bin.· Plastic ladle of 1 table-spoon capacity · Go to your nearest BOC store. Buy one kg· Hammer to test wheat dry ice. It will cost about $15.· Labels for containers ( Lid Labels and Product Labels)Hammer TestTest a wheat sample for its moisturecontent. This will ensure it is dry enoughfor long-term storage.I recommend you use the "Hammer Test."Take a spoon of wheat from your wheat- · Drive back with the window partially opensack. About twenty grains. Place them so you have air flow in the car.on something made of solid metal. Apiece of railway line, a vice or steel anvil · You need to work quickly as a team beforewill do. Hit the wheat kernels once, hard, the CO2 evaporateswith a hammer. Assign Team Member Tasks You can do this all alone but its better to get Photo by HJE CC By-NC 2.0 helpers and work as a team. Mormons storing wheat together is similar to the old-fashioned ‘barn-raising’ of our early pioneers. We work together as a team. Assign people to the roles of a Sack-Man, Pourer, Bin-Man, and an Ice-Guy.If the wheat shatters into pieces it is dryenough to store long-term. If it mashesor does not shatter cleanly, then therestoo much moisture in your wheat forstorage.Longer seeds should snap smartly, cleanlyin half when bent if they are this dry.Wheat and corn seeds should shatter andpowder when hit with the head of ahammer. Photo by HJE CC By-NC 2.0Thats our Dry Seed Test. It is veryreliable. Beans, peas and other large seedswill shatter if sufficiently dry.
  3. 3. Storing Wheat in CO2Train your team · The “Ice-Guy” shakes down the wheat to settle it so the container can be filled to near Teach your team the following: maximum capacity.· Warn team that dry-ice is very cold Fit the lid with one corner slightly raised so at minus 78 degrees. They must not the expanding gas can bubble-off. If you seal touch it, eat it, or play with it. Read it too soon the expanding gas might pop the aloud the Safety Data Sheet about lid of and spread wheat everywhere. it.Keep your hands dry when working with it. · The “Sack-Man” will remove the Space- Savers as they are filled with wheat and stack· Ensure the room is ventilated and has them at least 4 meters away so your work air flow. area is not crowded. Do not stack two layers high until after ‘Bubble-off’.· Keep the lid on the Dry-Ice Esky as much as possible. Avoid inspecting it unnecessarily. Some dry ice will sublimate every time you open the container. Use it within hours. The Afix Labels sooner the better. Place labels neatly and squarely on each Space- Saver bin with the date packed and contents.Learn Your Duty then begin· The “Sack-Man” will open all wheat sacks. They will also fold and stack empty sacks. Keep the area clear. The “Pourer” spours 4 cm wheat in Photo by HJE CC By-NC 2.0· the bottom of each Space-Saver in the room. This will cover the bottom of each Space-Saver. It prevents the base of the Space-Saver freezing.· The “Bin-Man” will inspect space- saver bins for contaminants during manufacturing process. Remove any loose pieces of plastic. Ensure each container is clean. They will supply new, empty Space-Saver Bins and to keep the “Ice-Guy” supplied with new Sublimation bins. Bubble-off for 60 minutes (Sublimation)· The “Ice-Guy” will use a long handled “Bubble-off” is the process where the dry-ice plastic ladle to deposit 10 grams (a sublimates (turns from a solid to a gas) in the heaped table-spoon) of dry ice into wheat and turns instantly from a solid to a gas. each Space-Saver on top of the small It expands to 500 times it’s size in this process. amount of wheat in the bottom centre Excess air will burp out of the partially closed of each 15 litre container. lid. The CO2 is colder than the air in the Note: 10 grams is about 3 pellets on a container so it will fill up from the bottom of heaped table-spoon. the container, pushing the air out. CO2 is also heavier than air.· The “Pourer” then immediately fills the remainder of the container with The lid should be fully covering the base yet wheat from the sack. able to allow gas under slight pressure to escape from the container so no pressure builds up. Air should not be able to get in during bubble- off.
  4. 4. Storing Wheat in CO2Allow the wheat to bubble off CO2 asthe dry ice sublimates. Oxygen AbsorbersThe containers will bubble out excess CO2 Do not use oxygen absorbers when storing wheatfor 40 minutes. in CO2. Its unneccessary.Vacate the room as the CO2 bubbles off. Only use oxygen absorbers when storing small quantities of wheat in vacuum packs.CO2 is not poisonous to inhale but peopleneed to breathe in some oxygen. You will not need them at all if using dry ice as the CO2 will drive out all air including theVentilate the room. Anticipate children, oxygen that is in the air.youth or visitors entering the roomovernight or in the morning. AboutThe room may be filled with CO2 if it If you have additional information or wish tothere is no air-flow. improve this document, please email Indemnity Clause No responsibility is taken by the author for theSecure Lids use of any information provided herein with regard to health and safety, food stored, loss ofSecure lids firmly 1 hour after filling the food, damage to food or flavour or any otherSpace-Savers. Ensure they are sealed aspect.perfectly. The dry ice will have sublimated.Excess CO2 and air will have ‘bubbled-off’.Where To Get ContainersSpace-Saver containers are good forstoring wheat. They have a 15 Litrecapacity with a lid that seals.Obtain them second hand for just a few Photo by HJE CC By-NC 2.0dollars each from fruit pie bakeries acrossNew Zealand. Barkers Orchards packagetheir processed fruit filling in Space-Savercontainers and send them full to fruit pieand cake bakeries all across NZ.They ship with two types of lids. One typeseals much better than the other. “I bought 12 empty containers, 2 sacksNew containers are made by Viscount of wheat and stored the wheat usingPlastics in Christchurch, Tel 64 09 276 dry ice all on my own. It took me two8679, sold in bulk. hours. I found it easy to store wheat alone.”Buying new is much more expensive,however, it ensures you get the lids that Hank Ensing has served as a ward welfare specialistseal best. in the Grandview Ward, Glenview New Zealand Stake and the Koromatua Ward, Temple View NZ Stake.
  5. 5. Storing Wheat in CO2 Drying wheat I dried wheat on a trampoline in the sun for several hours. You can dry it on a tarp on the floor in the sun. Another way to dry wheat in in buckets with sloping glass lids. Allow a gap for the air to circulate. Stir the grainCheck on your wheat after 1 year. regularly. Cover with a light mesh if you want to prevent weevil from landing on it.Is it dry enough?If it smells like mold then feed it to the Photo below is by Jacqui Vowles, drying herhens. family grain in New Zealand.If it is just damp you can dry it.