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University of Guelph paper- Flushing is a myth!

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    Originally posted by CrustyCruz View Post

    The labs this company used aren't even capable of testing for off flavors in Cannabis that come from excess fertilizers. The human body is very capable. I'm guessing their test subjects have never smoked anything but overfed chemical crap.

    I see it every day. They call it "gas" in my neighhood when the bud has been ruined by phosphorus OD. You simply can't discuss this with most pot growers for the same reason I suppose. It's not phosphorus causing the flavor, it's carbon attached to the phosphorus source, but pot growers refuse to accept that plants uptake carbon. (enjoy your cancer everyone, even all you pseudo hippy biochar bros out there)
    And you will have cancer just for smoking, so... Why bother, huh?

    Comment


      I don't even have to leave my house to know who grows unflushed weed. Just ask them what their cut smells like.

      Click image for larger version

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      Why does this guys cut of MAC smell like Botanicare instead of MAC?

      BECAUSE FL00SHING IS MYTH??

      Comment


        I've seen a few papers back this up but not everything is understood. I've grown since 1986. There is a difference if you flush or don't in the taste and harshness. At some point science and studies will find out why. Numerous times I've intentionally flushed and not flushed side by side plants of the same strain. There is an obvious difference to every tester when I've done this. There is a lot more to learn on this subject.
        Drug testing is proof employers can't tell the performance difference between an employee on drugs and one that is not.

        Comment


          What is run-off ec values for your control and your flushed pots before and after flush?
          "I have only read fragments of your posts. But I have read enough to know that you can grow some mean herb."
          --- CVH
          _____________________________
          "we growing.
          till the fucking zombies show."
          --- Useless.Gardens

          My current thread

          Comment


            Originally posted by Elmer Bud View Post
            Irrigation Management Strategies for Medical Cannabis in Controlled Environments
            By
            Jonathan Stemeroff
            A Thesis
            presented to
            The University of Guelph
            In partial fulfilment of requirements
            for the degree of
            Master of Science
            in
            Environmental Science
            Guelph, Ontario, Canada
            © Jonathan Stemeroff, November, 2017
            Irrigation Management Strategies for Medical Cannabis in Controlled Environments
            J. Stemeroff, MSc
            Erratum Document for Previously Approved E-Thesis Submission
            A post-approval (re)-examination of the raw data discovered unrecoverable errors in the
            handling and reporting of the water potential data, with further issues regarding the nature of
            the treatment differences. The general errors are:
            1) Upon further review of the raw data logs it was discovered that the Control and Mild
            Stress treatments were in fact the same (ref. page 38). Both treatments had the same
            number of irrigation events (i.e. total water applied was the same) in all three trials.
            The irrigation events were offset by 1-day but they both occurred at 2-day intervals.
            a. Resolution – Any observed differences between the control and mild stress
            treatment should be disregarded. Detected differences in agronomic and
            metabolite production between the Control and Mild Stress treatments can only
            be attributed to random chance and variation in the growth facility, not a
            response to distinct irrigation regimes. Affected Figures – Disregard Control and
            Mild Stress treatment effects in Figures 4.11 (page 54) and 4.13 (page 55)
            2) Raw data was not properly filtered to remove erroneous readings (e.g., positive values
            of plant water potential; non-sinusoidal or flat line response) resulting from instrument
            fouling and condensation within the sensing chamber. The inclusion of erroneous data
            resulted in skewed relationships between cumulative plant water potential and
            cumulative vapour pressure deficit.
            a. Resolution – Disregard the relationships depicted in Figures 4.1 (page 44), 4.2
            (page 45), 4.3 (page 46), 4.4 (page 47), 4.5 (page 48), 4.6 (page 49), 4.7 (page
            50), 4.8 (page 51), and 4.9 (page 52).
            3) The apparent two-phase relationship between CWP and CVP shown in Figure 4.1 (page
            44) and subsequently highlighted and independently analysed in Figures 4.2 (page 45)
            and 4.3 (page 46), is the result of missing data (logger failure) during the middle phase
            of the first growth cycle; the missing data was not properly accommodated resulting in
            an apparent separation of the response relationship between early and late growth
            periods. The subsequent analysis of flower cycles 2 and 3 included an analysis of this
            artifact-based separation; as such, Figures 4.5 (page 48), 4.6 (page 49), 4.8 (page 51),
            and 4.9 (page 52) are not meaningful as there is no data to suggest or support treating
            the data as two distinct groups.
            Based on the above errors, any conclusions outlined in section 6.1 (page 62-65) should also be
            disregarded.
            3
            ABSTRACT
            Irrigation Management Strategies for Medical Cannabis in Controlled Environments
            Jonathan Stemeroff Advisor:
            University of Guelph, 2017 Professor M.A. Dixon
            Medical cannabis production is a new industry in Canada and represents a challenge
            for the production of a repeatable and standardized product for medical use. A reliable and
            reproducible environmental control strategy can contribute significantly to meeting this
            challenge. Irrigation management and control of plant water status is one of the key
            environmental control elements. To assess the effects of various irrigation management
            strategies this study deployed in situ stem psychrometers to measure the water status of
            plants. As a routine feedback device for irrigation control these devices are not ideal for
            large-scale production so correlation with the key environment variable representing the
            aerial demand for moisture (vapour pressure deficit) was assessed. By establishing a
            relationship between cumulative water potential (cWP) and cumulative vapour pressure
            deficit (cVPD) an irrigation management strategy that predicted plant water status based on
            measurements of cVPD could be employed. Three treatments; control (irrigation events every
            1-2 days), mild-stress (irrigation events every 2 days), and moderate-stress (irrigation events
            every 3 days) were tested. The effects of flushing were also investigated to determine
            whether it had the intended effect of reducing nutrient concentrations within the dried bud.
            Through the use of psychrometers, water status (cWP) thresholds were correlated with
            humidity (cVPD) thresholds and reduced irrigation frequency resulting in water use
            reductions up to 45.7% which had negligible impacts on yield and cannabinoid profile.
            Flushing was found to be ineffective in removing any significant amount of nutrient from the
            bud.
            Breaking that Ctrl+P down into three chunks. We have the BOLD CLAIM. Then before that the students work. Before which the teachers response of teabagging them. In fact, the report on how much the pupil got wrong, is the longer part of this document. This pupil watered some plants on 'even' days of the month, and some on 'odd' days. Then called one room the control, and the other stressed. Reporting to us, the difference in water use. Then, If I remember rightly, they did some vpd work. Using the results from a datalogger they forgot to switch on.

            They seem well qualified to me. There can't be a difference

            Comment


              Originally posted by f-e View Post

              Breaking that Ctrl+P down into three chunks. We have the BOLD CLAIM. Then before that the students work. Before which the teachers response of teabagging them. In fact, the report on how much the pupil got wrong, is the longer part of this document. This pupil watered some plants on 'even' days of the month, and some on 'odd' days. Then called one room the control, and the other stressed. Reporting to us, the difference in water use. Then, If I remember rightly, they did some vpd work. Using the results from a datalogger they forgot to switch on.

              They seem well qualified to me. There can't be a difference
              Musta been smoking some good shit...
              "No Nation has ever benefited
              From a protracted war"
              -Sun Tzu

              Comment


                Many people's growing styles is strongly defended with ignorance and pride. Especially indoor growers that have limitations to the environmental conditions. Often short cuts, gimmicks and baseless claims of potency, quantity and improved quality are sold/promised.
                . Thinking that research and knowledge is being gained. Unsuspecting growers by into the hype and accept it as true. Compounded by numerous growing sites that actually have very few people with real knowledge. This information is passed along, including techniques that aren't actually tested in side by side grows.

                Here is some simple truths, super cropping doesn't give you more and bigger buds.
                Nobody goes to the doctor for a second circumcision, it's not making your dick bigger !

                Flushing only changes the Ph of your growing medium. You don't flush chemotherapy from a cancer patient.

                Plant seeds directly into the final growing container, never transplant.

                If you have a 4' x 4' tent, find a single container the same size or build one. Calving sleds or ice fishing sleds work great for this. Your plants will respond in ways you won't believe.

                Make thumb size holes in your soil going to the bottom. Rotate blending potatoes, bananas and water melons topping off the blender with water. Purree until there's no noticeable pulp. Fill all holes with the sugary mixture. This will supply everything your roots need all the way through harvest.

                I have done this for five years and my plants have never been bigger or stronger. I don't have insects in my greenhouse that ever get out of balance. Healthy plants don't get infestations. You don't have to replace your soil it only gets better with each grow. You will see the best phenotypic expressions you have ever had.

                Enjoy your next grow!
                Peace farmerlion
                MedDakotabis

                Comment

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