Effects of too much Potassium?
paulinct
16 years ago
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paulinct
16 years agolast modified: 9 years agoRelated Discussions
Determining if adding too much secondary elements?
Comments (20)I completely disgree with the disagreement ;) Basing nutrient availability primarily on base cation ratios is out dated and poorly supported by research. There is something to competition of nutrients, but it's not nearly as important as making sure that you have sufficient amounts of each nutrient. That (and the fact that the BCR method results in over application much of the time) is why most labs have gone to a sufficiency factor system in favor of base cation ratios. Boat loads of studies have been done to support this. Here is a discussion which sites a good amount of support from a University of Wisconsin study: Oh look. Here it is. Note that the highest corn and soy bean yields were in soils with Ca:Mg ratios which showed magnesium at approximately 3 times higher than calcium (Holy cow! Can that be?!?) and potassium as much as five times higher than magnesium. (Whaaaa..?!?!) And there is plenty more out there showing the same stuff. The BCR stuff was championed by Bear et. al. (read: quacks) and their ideas have been all but dismissed except in myth, lore, and comedy skits. Oh yeah, all I said was not to sweat the sulfur in potassium sulfate in regards to pH. That sulfate is not going to have a huge effect on pH (if any) I say again, don't sweat the sulfur in potassium sulfate if that's they way you want to go. You may note that I recommended the greenwaste compost to bump up primarily potassium. I think that would be prudent for this year, based on the test. Actually, I never said don't sweat the soil test before, but you know what? I'm gonna say it now. Take note of the fact that you could use some potassium. Put in the compost, plant some plants and test again next year. Use this year's test as a base line and adjust from there. Yes, use the tests as a guide but don't freak yourself out over trying to get everything perfect in one shot. Although some adjustment certainly may be warranted after you've gone through a crop or two, plants tolerate very wide ranges of nutrient and chemical conditions and they might do just fine. By the way, if you depend on potassium and magnesium to increase your pH, you're gonna wait an awfully long time for very little change....See MoreToo much wood ash...Now what?
Comments (20)I live in slc, utah. My recommendation is to get a good weed free source of horse (or cow) manure that has been composted for a year or more (fresh will work best in the fall). Horse stables and dairies often feed alfalfa hay primarily; if the animals do not graze on weedy pasture, their manure should be excellent. Fresher manures release ammonia; it will damage tender plants if used as mulch. Manure that is tilled in and watered keeps plants safer. Remember, ashes contain about 30% calcium carbonate (lime). The object is to buffer its effects. First, till your entire garden area down to a depth of at least 8". Then spread a 6" layer of manure over your entire garden and till it in. Finsh with a 2" mulching layer, each spring and fall, turning the previous layer in spring and fall. This mulch will keep your shoes and knees clean and add everything the garden needs for nutrients. Your soil ph will buffer down below 7.5 (culinary water ph) and you will have the best loamy clay garden soil of the neighborhood in the spring of the second year!...See MoreDahlia plants too tall & too much foliage
Comments (7)Dahlias grow taller in part shade. People who grow them under shade cloth report that a variety that may reach 5 feet in full sun will grow to about 8 or 9 feet tall under shade cloth. Many people have dahlias reach to 10 feet under shade cloth. So, I am assuming that you have a bit of shade in your garden and dahlias are reaching for the sun. Fertilizer in so far as what the ratios of N-P-K are used has little to do with plant height. Dahlias need fertilizer that is balanced, meaning that some of each number is present. Since phosphorus, the middle number is being banned in some states, it may be difficult to find a balanced fertilizer. However, most gardens accumulate phosphorus and if you fertilized in past years, there will be enough in the soil. I use fertilizer that is high in both Nitrogen and Potassium. The ratio is 4-1-4 and the actual numbers are 20-5-21. I mix my own fertilizer and buy three fertilizers to achieve that number. This is very concentrated fertilizer and a little goes a long way. Whatever fertilizer you use, apply in small amounts very frequently and the plants will do better. People tend to over fertilize and that is not good for the environment....See MoreToo much potassium in maritime NW soils?
Comments (15)Comments appreciated. I know of no place other than Garden Web where a discussion like this can occur. Here are some of Solomon's comments, which prompted this posting (I'm quoting him not because I know enough to agree or disagree, but so that the information is available for discussion): First, he generalizes that the Maritime Northwest has a fairly uniform geologic history, and that the soils throughout this region are generally similar in mineral content. So he doesn't encourage testing. Then, on page 27: "the essence of our region's soil imbalance hinges on an overly high level of an otherwise useful mineral, potassium. Our soils usually have lot of potassium - maybe too much. I've studied the results of hundreds of soil tests performed by OSU and I have never seen a test showing a marked potassium deficiency - lots of other deficiencies, yes, but not of K" Also on page 27: "the nutrients that provoke plants to become highly nutritious - calcium, magnesium, and phosphorus - are the ones most readily lost. I view this as a widespread regional mineral imbalance." He goes on to say that because plants concentrate the potassium in the fiber and woody parts, and those are the main parts that are used in a lot of animal feeds (and therefore enter into manures) and composting, while other minerals are leached out in rain or removed in farm products, that we are artificially increasing the potassium in our soil while other components decline. So, he offers that the more compost we add to our gardens, the more we bulid up potassium relative to other elements. The Clemson link above was really intereesting. In a way, it could be taken to support a contention that using a lot of plant stems in compost would increase the soil level of potassium where that compost is used. "Luxury consumption and leaching loss make it undesirable to try to build the potassium level above medium." It does state that potassium will leach into the clay layer - although, my soil is all basically clay layer... now amended with lots of compost. Anyway, I'll keep watching for comments. For now, the fruit peels will still go into the compost....See Morelou_spicewood_tx
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