Test 2.4: Where can I get the sap pH Meter? And what do results mean?


#1

I have had a few people enquire about getting a sap pH Meter for doing test 2.4.
The one suggested on the website is this Horiba LAQUA Twin B-711: http://www.horiba.com/laquatwin/en/lineup/index.html#ph

One place you can buy it in the UK is here, for around £120 (+VAT). @nielscorfield can you confirm this is the correct one?

Does anyone have any experience of using it? When I saw Graeme Sait speak at Groundswell last year he talked a lot about using sap pH as an indicator of plant and soil health. I wonder as an organic farmer how helpful it is as a measure to inform management decisions. If the pH of a plant is too high or too low how would that inform our actions?

( Extra: It appears the B-712 is sold more widely (like here), it’s slightly more expensive, but it seems that the main difference is just that it can give readings to a higher resolution of 0.01, rather than the B-711 which just does up to 0.1 accuracy. )


#2

£120 is a bargain

It’s probably more applicable for perennial growers. And using a mineral balancing programme.
But in the same was as brix it can show a pos or neg trend. 6.4 Is the target.
Foliar applictions are the usual response.
Joel Williams also has experience of using this device.


#3

This webinar will prob have some related info