first things first, as i like some order in my head :)
i’ve had both ph test kits…and both indicate the ph range sufficiently accurately for gardening purposes, when used properly. i am by no means an authority on ph test meters. here’s my account:
the probe type meter is not bad but has a major fault in construction. the instructions state that you should twist the probe into the soil BUT doing so ends up breaking off the wires attached inside the probe. the reason being that a very small section of the aluminium probe/pipe has been flattened (with pliers or such) which is not sufficient to stop it twisting around in the flimsy plastic casing. several twists and the wires twist off….and you always get a perfect 7.0 reading. you could easily remedy this problem by unscrewing the casing when the meter is still new/working, and secure the rod with suitable device/adhesive to prevent it from movement. the one thing that’s needed for using this test kit is adequate moisture, as it will not give a good/any reading in dry(ish) soil.
the chemical reaction kit is a little messy and cumbersome to use, and you should follow the instructions precisely. Someone mentioned mixing soil samples to get an average reading. i think it’s better to test each sample separately, to make accurate assessment of soil acidity/alkalinity, especially if different types of soil are involved. mixing up soil samples for a test produces an average reading…whereas the plants aren’t growing in the average ph soil; instead they’re growing in the soils with the specific ph readings of individual sites. to better illustrate my ramblings an extreme example can be considered where, one side of the yard sits in always moist conditions producing a very low ph. on the other side of the yard a raised bed with bought soil mixed with some beach sand may have a high ph reading. mixing the samples will produce a false indication that the site has a balanced ph of about 7.0. The disadvantage of the chemical reaction test kit is its useful lifetime, with the chemical agents going stale in about 2 years. However this isn’t likely to be a concern with either test kit unless the soil needs regular long term ph regulation, which most soils don’t. in the case of extremely acidic or highly alkaline soil, initial large scale soil replacement or amelioration is undertaken, and regular additions of compost and (irregular additions of) dolomite help to balance the ph towards neutral. Alternative being to use existing soil conditions with plants that will manage in those conditions. What i’m trying to say is that it’s a good idea to test soil ph when finding out about the soil you have but, most ph test kits gather dust thereafter.
there is a third alternative, being many times the expense of a ph meter though. if you’re serious about growing own food on soil unknown/suspected of pollution, then a professional soil test will give ph readings, TOC (Total Organic Content – how much organic matter in soil) readings, and readings for all the major minerals including heavy metals. Such extensive tests tell you exactly what’s in the soil, and what’s needed. i haven’t used such a service yet. I think a residential backyard (size) test of this nature would cost approx $150. You get some vials to fill with soil samples and send in to the lab. someone correct me if i’m wrong on pricing etc. It may seem overkill. But you probably save quite a lot of money by buying exactly what the soil needs (in terms of fertilizers/minerals) instead of continually guessing and overdoing fertilizers just to be sure.
sorry about my writing style (or lack thereof) as i try to lay out things as clearly as i can. i know it usually comes across as “speaking from the altar.” take from it what you will.
night all
Yeehah said:
veg gardener said:
Hey guys,
i have been thinking about getting a Ph Test Kit for my garden to find ph of the garden beds etc game across these two on the seed company i buy from over the internet.
Link 1:http://cornucopiaseeds.com.au/zencart/index.php?main_page=product_info&cPath=13_49&products_id=484
Link 2:http://cornucopiaseeds.com.au/zencart/index.php?main_page=product_info&cPath=13_49&products_id=253
Please tell me the differnce they both about the same price i just need some help. p.s i already have termometer.
I’ve only ever used the second one, or one a bit like it. You take some soil samples from different spots in the garden, mix them together in a bucket, then get about a teaspoon full out, put it on a flat thingy, drip the pH test solution onto it, then squirt the pH test powder onto it, and compare the colour that you get with a card, the colour tells you the pH of the soil.
Has anyone here ever used the meter type that you stick in the soil? How accurate is it?