[NAFEX] soil ph

Bob Kelly bkelly66 at bellsouth.net
Wed Oct 10 13:41:42 EDT 2007


I ran across this study on the effects of several types of mulch at the Univ. of Florida.

http://www.treelink.org/joa/1999/march/06_COMPARISON_OF_LANDSCAPE_MULCHES_duryea.pdf

Bob Kelly
Aberdeen, MS
  ----- Original Message ----- 
  From: Mark & Helen Angermayer 
  To: North American Fruit Explorers 
  Sent: Wednesday, October 10, 2007 11:50 AM
  Subject: Re: [NAFEX] soil ph


  Hi Jerry,

  There has been a lot of discussion on this forum about the effect of pine needles on pH.  The basic jist seems to be pine needles only lower pH if they are grown on acidic soil to start with.  Pine needles grown on alkaline soil will not lower pH.  Regarding sulfur to lower pH, I don't know if it's the best way, but it's probably the cheapest.  Whether or not you use it may depend on how much sulfur you have in your soil already (although I think it's pretty rare for fruit trees to develop sulfur toxicity).  7.5 pH is not bad out of line, although it's on the upper range for most fruit trees.  Ours was 6.9 last summer and I added a little sulfur to bring it down a bit, but also to counteract the very alkaline water I use to irrigate (9.4 pH).  

  Mark
  Kansas
    ----- Original Message ----- 
    From: Jerry 
    To: nafex at lists.ibiblio.org 
    Sent: Wednesday, October 10, 2007 8:19 AM
    Subject: [NAFEX] soil ph


    I posted a question yesterday about lowering ph in my soil which has a fair amount of clay, tho not tons. I had used horse manure, horse bedding actually, which contained manure and absorbed urine, in a sawdust base.  I do not know what the sawdust was from.  I had the soil tested at the local farm bureau, and it was quite fertile, but too basic.--ph of 7.5.  The person doing the testing said it was probably due to the horse urine, which would decompose to ammonium hydroxide, which, of course would be basic.

    I had read another post, which prompted my question, about adding gypsum to soil to loosen up clay (which is really not that necessary for me as it tills up quite nicely) but which also lowers ph.

    So here are my questions:
    1.  Does gypsum really lower ph?
    2.  Do pine needles lower ph?  I've heard they do,  but one person say no way.
    3.  Are compost and sulfur the best way to go?
    4.  Does horse urine really make soil acid, as several have said?  I'm surprised at that.

    Thanks for all your help!   Jerry in southern Indiana





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