Do pine trees make alkaline soil more acidic, or is that a myth?
gruntle
16 years ago
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lou_spicewood_tx
16 years agoKimmsr
16 years agoRelated Discussions
how do i make my soil to acid?
Comments (9)Are the plants in the ground or in pots? Mixing peat moss into the soil will lower the pH pretty quickly. Adding garden sulfur is easier, but it takes several months for the pH to drop. I'd use sulfur, and make sure the plants are mulched with some kind of organic mulch, like compost or wood chips. As long as there is a lot of organic matter on top, the pH is not so critical to their survival, although they may not produce well until the pH is lower. You can find bags of sulfur at a lot of garden centers. I also see it at Home Depot and Lowes in the garden section with the garden fertilizers. Directions on the bag will tell you how much to use. Alex...See MoreDo Blueberries Still Need Acidic Soil If Soil Fertile?
Comments (56)I will answer the questions that were asked of me, above. The sulfur that goes into the bottom of the "V" shaped hole is not mixed in with the dirt because I want it to be assimilated slowly, over a period of years. The only purpose of this application of sulfur is to counteract the tendency of the surrounding alkaline soil to raise the pH of my blueberry shrub. I don't know how effective this method is, I have never tried to prove that it accomplishes what I expect. The typical hole dimensions are 24 inches diameter by 16 inches deep. The reason for putting down sulfur in a ring, on the surface, is essentially historical and idiosyncratic. When I started growing blueberries, back around 1993, I did not have a local source of sulfur, so I was using white vinegar, 5% acidity, mixed with our local tap water, to lower soil pH. This method works, but the vinegar disappears in about a month, so you have to keep repeating the application over the growing season. It is not a practical method for lowering soil pH. When I finally picked up a pH meter, and found a local source of agricultural sulfur in 50 lb bags, I had maybe 16 blueberry shrubs already well established, and I did not want to dig them up, apply sulfur, and replant. So, I applied sulfur to the surface, and that is how I have been doing it ever since....See MoreMaking soil more acidic
Comments (19)I think that the difference in buffering capacity of the soils in question is the reason that people see different results and disagree on this topic. Here is an example of how buffering capacity of the medium will affect pH changes. Assume we have two different 100 gallon tanks of water. Tank number one is pure distilled water. To this tank we add a few drops of sodium hydroxide to raise the pH to 8.5. Tank number two is water drawn from a well with very high levels of minerals primarily consisting of calcium (Ca2+), and magnesium (Mg2+) metal cations ("hard water"). This water measures a pH of 8.5. Now we have two tanks of water that both measure pH at exactly 8.5. But both tanks are not created equal! "Think; two different gardens, both with pH 8.5 soil" We want to lower the pH to neutral so we will need to add an acid to both tanks. Tank number one will only need a few drops of hydochloric acid to lower the pH to neutral, while tank number two may require 100x more acid to become neutral. The reason for this difference is the buffering capacity of tank number two due to the high levels of calcium and magnesium metal cations. This has been my hands on experience from hydroponic gardening and I believe that the same chemistry applies to acidic soil amendments such as peat moss. Therefore, depending on the specific soil buffering capacity, gardener number one may require only a small amount of peatmoss (by volume) to change the pH of his soil from 8.5 to neutral, while gardener number two may require vastly larger amounts. Here is a link that might be useful: My soil test, oh happy days..... not...See MoreAlkaline clay soil seeking acidic amendments
Comments (24)Chasing pH is a futile endeavor. Well, that depends on what your goals are, what your pH is and your access to resources. You're trying to push your pH from an 8+ in calcareous clay down to a 5.0 and you're on a budget? Yeah. That's pretty futile. Now let's say you've got a pH of 7.5 in a sandy soil with no lime and would like to shift it down to 7.0 or even a little acid so that your maple will stop showing symptoms of alkalinity induced chlorosis. Let's also say you have the means to buy some sulfur (and/or iron sulfate) pre-plant and use acidifying fertilizers to keep the pH down over time? Not futile at all. In fact, it's really common. As free hydrogen is replaced by anions (e.g. calcium, magnesium, sodium, potassium) the pH rises. Well, not really. pH is not a relationship of hydrogen to other cations. pH is an expression of the relationship between hydrogen and hydroxide (OH-). Note that hydroxide is an anion. That's why you can always calculate your pOH if you know your H+ concentration and vice-versa. You will never be able to calculate your pH from your concentration of other cations. At pH 7.0 and above there is no free hydrogen in the soil.Actually, if you have a pH of 7.0, that means that the concentration of hydrogen is exactly the same as the concentration of hydroxide in the soil solution. If you had no hydrogen your pH would be 14 and your pOH would be 0. I think you may be thinking of exchange sites on colloids. If you have a pH of 7.0 or above you may indeed have 0% hydrogen (or actually so close that it is reported as 0% on a base saturation analysis). Also, you can't raise your pH by just picking a cation and increasing it. That's why you won't get an increase in pH from adding gypsum (calcium sulfate) except under special circumstances....See Morereg_pnw7
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