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[compost_tea] Re: drip irrigation



--- Thanks Mike and Michael. Great questions and answers. I was 
wanting those answers yesterday and didn't have time to ask. I am 
plugging tips and wondering how fine a filter is acceptable. My tips 
are nearly 1/16 inch dia. Keep that lab open 7X24!!!!!HAHAHAAAAGH
Dennis

In compost_tea@yahoogroups.com, "Mike Harvey" <mharvey@w...> wrote:
> Mike Daniels,
> Correction to last post 100 mesh equals 141 micron.
> 
> According to "Drip Irrigation" by Netafim Australia following is 
what to do.
> 1. Flush all mains and submains and divide irrigated are into 
smallest plots and treat individually
> 2 Check pumping rate. required dose of 30% phos acid is 1 litre per 
cubic metre of discharge.
> 3 Test max discharge of inject pump (or venturi) use only injectors 
etc that are acid resistant.
> 4 Prepare volume of solution equal to one tenth the hourly 
discharge rate of the injector pump ( or venturi etc).
> CAUTION  add acid to water never  water to acid.
> 5 Start injector with irrigation system operating.
> 6  Check pH at the furthermost lateral with meter or litmus paper. 
The required pH is 4.0.
> 7Continue irrigation for 30 to 60 mins. The irrigation should then 
stop and water left in the lines for about one hour.
> 8Flush the whole system.
> Example of calculation required.
> Pump discharge    20m3per hour
> Injector pump rate   250 litre per hour
> Acid required (1Lper m3)    20 litres
> total solution required 250 + 10 =25 litres 
> Therefore add 20 litres of acid to 5 litres of water  to make up to 
the 25 litres.
> 
> The phos acid is Tech grade 95% (or is it 85%) phos acid available 
in 200 litre drums. Cost around $1.20 a litre?? 
> Regards Mike Harvey
> New Life Soils www.composttea.com.au
> 
>   ----- Original Message ----- 
>   From: Michael Daniels 
>   To: compost_tea@yahoogroups.com 
>   Sent: Thursday, September 18, 2003 5:30 AM
>   Subject: Re: [compost_tea] drip irrigation
> 
> 
>   Mike,
>   Is the phosphoric acid dosed or added using a venturi system?
>   What concentration of phos acid and is it foodgrade?
>   Regards,
>   Mike Daniels (Vineyard Organics)  
> 
>   Mike Harvey <mharvey@w...> wrote:
>     Ron,
>     Great question Ron, this is something that has huge potential.
>     Some points for consideration, based on Australian drip 
irrigation systems.
>     Filtration sytems are usually 100 mesh (100 micron) this is 
very fine and
>     will filter out Fungi that has been allowed to grow out to 
reasonable size.
>     That is for our brew 24 hours at 28deg C down to 22dec C, this 
is too long
>     as the fungi grow out to a size that will be filtered out. (You 
may be able
>     to use a coarser filtration system more suited to larger 
openings in the
>     water sprayers you use)
>     I spoke to the folks at SFI Australia and they advised me to 
use a short
>     brew time, more like 10 hours, long enough to activate and 
begin growing the
>     fungi etc but not so long that the fungi will block filters. I 
have been
>     doing this since and have had no trouble with it going through 
systems.
>     Phosphori c acid can be used to clean irrigation systems, the 
acid will
>     disolve organic matter in the lines and the phos acid will 
supply some
>     phosphorus to the plants (it will of course kill MO where it 
drips) ask your
>     irrigation supplier for more details.This is usually done once 
a year if
>     required.
>     As with other fertigation systems always pressurise the system 
fully before
>     injecting and then ensure enough water passes through the 
system to flush
>     all material out.
>     My experience is that liquid fish should not be used in an 
irrigation system
>     as it will tend to block things. Molasses, Humic acid, and  
AACT are more
>     suited.
>     Regards Mike Harvey
>     New Life Soils, www.composttea.com.au
> 
> 
>     ----- Original Message ----- 
>     From: "nehemiahlev" <nehemiah@t...>
>     To: <compost_tea@yahoogroups.com>
>     Sent: Wednesday, September 17, 2003 1:37 AM
>     Subject: [compost_tea] drip irrigation
> 
> 
>     > Hi,
>     > I think this subjec t might have been addressed before but I 
can't
>     > find anything in the archives. I am setting up an irrigation 
system
>     > for a small nursery that will be using compost tea. Does 
anybody have
>     > any input on keeping drip irrigation lines clean. What 
products can
>     > be used that won't effect the organisms? There is also have a 
fairly
>     > high sulfur content in the water. Will this affect the 
microbes and,
>     > if so, is there a way to deal with it? I am also needing info 
on
>     > pumps that would be appropriate, for this type of 
application, that
>     > would handle, the tea and other organic fertilizers. Thanks
>     > Ron
>     >
>     >
>     >
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