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    Eyre Peninsula, South Oz

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    Engineering, Ecology, living off the land
  1. Sorry Rav, I was using YOU as in " all the people involved in the conversation", I dont see glomalin as a product that can be added, it is grown in the soil as part of a process, the researchers describe its function as a sticky string bag that turns into a waxy bag over time, this makes soil very granular, so you have billions of tough little packages that resist things like nutrient leeching, water logging, etc . I have dug up an illustration of the process of getting an arbuscular fungi to join with a plants hair root. This is step one in forming Glomalin. And here is essentially the problem, the plant has got to want this to happen (as a seedling) and exude a compound that attracts the spores hyphae to it. The population of spores then multiply with the plants growth and trade nutrients for complex sugars through the plants life. Step two in forming glomalin. If we miss that window because the conditions are not right, perhaps we are overstimulating the seedlings with mineralised nutrients or we are killing the spores, we never start building the fungal population early enough in the plants life to reach a critical mass. Or perhaps the conditions mean that the soil is dominated by opportunist bacteria rather than fungi. it is all about creating the right environment to make it happen. I am finding it incredibly difficult to get it right. Unfortunately I have to sneak off and do some work, living in a communications black hole means i have to leave this there till I get back. cheers
  2. I think you are missing the context of this Ravnis. To get large amounts of Glomalin you need to cultivate the Arbuscular mycorrhizal fungi that makes it, on the roots of the plants, in the growing medium, in situ. That involves meeting a few (5) basic criteria in the growing system. I think its doable, but you need to be prepared for some rather large dents in your pride, going down this rabbit hole pretty much smashes every conventional preconception/idea on how soil works, and plants and nutrient cycling for that matter.
  3. you ask some hard questions Cecil. Have you got the gear to measure Delta P and O2 % ? Back in the old days when I was part of a research team out in the field we had machines that measured total gas pressure, but then we had to take a separate barometer pressure reading to calculate the differential pressure (delta P) . the barometers were fragile and unreliable and all the calculations were done with a pencil and paper. we were studying chronic disease in fish, our measurements were not always good enough to show a link with supersaturated water at lower gas pressure levels and diseased fish over time.. if the bore is not deep and there are no air leaks on the intake side it might or might not be supersaturated and the ratio of Nitrogen to Oxygen might be very similar to aerating it. water quality guidelines for dissolved gas supersaturation page 7 this is pretty old thinking but a good starting point, if you click on the table of contents (toc) and go back to the start it makes some sense. My guess is that injecting O2 into the water will have a different result depending on the conditions at the time. it might just increase the total gas pressure
  4. it looks like cross site scripting. they used to attack login panels that returned users data as part of the error message in the ol days. This one looks like it is trying to install some java once you press OK.
  5. you might have a colony of microbes that are removing an oxygen ion from the nitrate and forming nitrite. that is a more common path in nature, for example bacteria and e-coli do it in the mouth and gut of animals (including us) because it is a reduction reaction it requires very little energy. Maybe these microbes are killed from a ph swing or perhaps a metal in the fish food is reacting with any free nitric acid in the water when the fish are introduced back in the system. Reduction to nitrite also happens with the decay or burning of plant material or dead critters on its way to gassing off . in a stable and diverse (soil) ecosystem there will always be some nitrites continuously formed, although with plants scoffing nitrates and other nitrogen compounds keeping the levels low and storing it as amino acids, it takes something like a cold snap to throw things out of balance and spike nitrite levels. if your nitrates are up for an extended period it is a possibility for sure.
  6. I forgot to mention that the lactic acid producing bacteria lives on the skin of the vegetable, super cleaned veg is not going to ferment easily, the population will be to low to build up easily and out compete others microbes. I have been told it is best seen in the white powdery look that you can see on red cabbage. I am lazy, for vinegar pickling I run jars and lids through the dishwasher till my benches are full, then sanitize them in the oven while I bottle batches.
  7. you could try a salt fermented pickle. your gear needs to be clean for this but not airtight Beks Backyard cucumber glut the grape leaves give them crunch or bite. NOTE. there is a typo on the page the brine solution is not correct 8% brine is the full strength version (very salty) 80 grams per litre 4% is the half strength version (slower ferment) 40 grams per litre
  8. Modified after Powers, M . C., 1953, Journal of Sedimentary Petrology, v. 23, p. 118 Hi, Hope this helps get a picture in your mind the top row is cube shaped sand from quartz or granite. the bottom row is from rock that forms shards or slivers the three columns very angular, angular and sub angular are all sharp sand. very angular is so sharp it will draw blood or wear your fingerprints away. angular is what I use for potting mix if I can get it. Look at the two middle columns, sub angular is used for concrete, it needs to flow when it is poured and worked but only a little bit sub rounded is for mortar, it is more plastic, it can be shaped with a trowel. playground sand, landscaping sand, builders sand is most likely to be sub rounded. it is also likely to be unwashed. unwashed means means it could have some clay and dust in it. the clay is a problem, the thing that makes clay what it is, is Al2O3 aluminium oxide. it forms crystals that contain water as part of its structure and that in turn attracts and holds more water (in the same way that soap does) and because clay is so fine it coats everything in a film of water. notice I have used the word "likely" nothing is guaranteed in the world of retail, that's where your testing comes in. chow, Yahoo
  9. I wouldn't put the fish back in just yet. It's not going to be a case of rip the plants out and its gone. (assuming this is what it is, I still favor gary's theory of periods of low oxygen from sediment.) all of the products that are produced from these plants are listed as category 2 /chronic toxicity code H411 what that means is that they are listed as chronically toxic to fish in the 1ppm to 10 ppm range and they dont biodegrade easily over time, that means they can accumulate in the water. The only way to reduce the levels in the tank is with a series of water changes over time. perhaps the water changes could be a 50/50 mix of fresh water and water from the other tank.
  10. Hi neighbor, has your vendor got any sand that is sharper than that for comparison? Sand that is used for making concrete or potting mix or seed raising mix. if you rub it between your finger and thumb like a pinch of salt it feels "grippy" like rock salt or sugar crystals. I think playground sand is the same as builders sand. the sand particles have no edges or corners, they have been worn away. and it has a small amount of silt or clay in it. mortar sand is the same stuff as builders sand after the clay is washed out.
  11. fish out of water this is only a transcript of the original TV story, doesn't do it justice but I know the iView video is blocked to overseas interwebbers. there is a lot of potential for education and motivation and links with other resources community ed
  12. Apologies, i read this and must have skipped over your reply after this that mentioned the separator.
  13. in my experience it is more likely that this is a " the last straw that broke the camels back" situation. I am only saying that because where livestock is concerned it is rare for just one thing to kill something. They are usually already struggling from other issues. where are the fish waste solids? if you are not removing them and they are not in the bottom of the fish tank, they must be somewhere in the system. I guess it will be in the growbeds or the bottom of the raft tank and some of the churned up fines could be hanging in the water column. some sludge or a dead fish laying in a pipe wont do the fish any favours.
  14. I think this is close to the latest thinking on filtration here, it reduces the flow to the radial flow filter and keeps it small and compact as it is only removing solids from the fish tank. the rest of the flow goes to the moving bed or netting filter.
  15. What I am trying to say is high levels of soluble nitrogen will make the plants keep the fungal population low and the plant will only have access to the nutrients it can physically reach with its roots. That will work provided we are supplying a constantly increasing supply of balanced soluble nutrition as the plants grow. If on the other-hand we use a staggered planting the first crop will have low mycorrhizal fungi (MF) but the second crop of plants should be exposed to lower nitrate levels and start to breed up the colonies (provided we are not sowing brassica's) once it is functioning there are a lot of extra pathways to store, release and transfer nutrients and it becomes resilient. Once this point is reached it should easily buffer nitrates. I have got my doubts that hydroponic nutrients will let this process start happening. I have pondered the legume thing for many years, I think rhizobia get out-competed by an explosion of the most rapidly multiplying microbe colonies as a soil comes out of a dormant/inactive phase at that point it is just a numbers and distance from the host game. I used to grow a lot of peas once, using a herbicide post emergence or late in crop would abort the nodules almost every time.