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RE: [compost_tea] Pressure & critters



I was just chatting with a friend who is a firefighter.  We were talking about AACT, the microbs and the sprayers.  We were just discussing this same subject of how spraying would probably kill the little guys worse so possibly than by hitting the leaf surface.

 

He was saying that for work he attended a clinic on handling mass crisis and weapons of mass destruction – the speaker was talking about how the fear of airborne bacteria sprayed from crop dusters was less of a concern than originally thought – because of the way they would be sprayed and how the mechanics of spraying would result in low survival numbers of the bacteria.  No idea if this is true as it seems that they could maybe just dump it out of an open hose just as well, but….

 

It seemed to fit into what we are discussing here with sprayers and how they affect microbes.

 

Would be interesting to get Doc E’s angle on this.  I remember talking to you about this at the ICTC meeting and you suggested someone should try testing before and then after spraying to show the effect sprayers have on a given tea sample.  I meant to ask you then, but has this not yet been tested in the scientific community?

 

Seems like a costly test for the individual user, but one that is important to all involved in AACT.  This may be another place for us to donate to the ICTC so that we could, as a group, accomplish such tests?  We could kick in some small monetary value each run such tests to find the best spray nozzles, spray methods, etc??

 

Mike

 

 

-----Original Message-----
From: Robert Norsen [mailto:bnbrew@yahoo.com]
Sent: Friday, July 25, 2003 4:50 PM
To: compost_tea@yahoogroups.com
Subject: RE: [compost_tea] Pressure & critters

 

Mike and All   I've been trying to say this for a while. Large cross section pipes allow the little ones to travel slowely even under high pressure.  Transition into a smooth small diameter hose.  1/'2" or 3/'8"   The 'gun should be selected to have largest possible innards so the velocity is low.  Finally the jet.  The jet can be a straight  ahead open hole.  cut accross the hole is a vee cut that allows the pressure to escape to form a flat fan shaped  spray. No sharp turns  except that last one.  Lower pressure will slow the impact during this last part of the trip.   

 

But the spray operator is going to want to have  choices of spray shape.  Dont know how to handle that.

 

I'm with you Mike  Hitting the leaf seems like the nost gentle part of the trip.  Bob 

 

 

Mike Bosko <mjbosko@jmtsystems.com> wrote:

Seems to me that theyre getting splatted against things immediately before leaving the sprayer thats how the sprayer works.  Pressure builds up in the tank, and then the water hits a fitting at the end of the hose connecter that in turn, makes the spray fan out and maintain pressure.  I cant imagine how that could be any better than flying through the air for a while and then hitting a plant  even if it were a jet stream, it seems better than what the sprayer nozzle does to them little critters.

 

Maybe Im thinking about this too much again, I dont know.

 

-m

 

-----Original Message-----
From: Jeff Lowenfels [mailto:jeff@gardener.com]
Sent: Friday, July 25, 2003 2:32 PM
To: compost_tea@yahoogroups.com
Subject: Re: [compost_tea] Pressure & critters

 

Pressures up to 70 PSI are what you can expect from a pump sprayer.  This is fine for the microbes. The problem is the velocity at which they hit things. That is where you need to be most careful. Splatted microbes are dead ones....Spraying is an art.

 

Cheers,

 

Jeff




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