Friends, we are doing pepper cultivation. we are getting good profit when three years back in that pepper making process.

this is one kind of disease we are facing in its leaves

enter image description here The problem is nowadays our climate changed, there is no usual rainfall. don't know the reason some of my peppers plants are dead. later, after find its roots are dead. I got some information from agricultural farms. but the problem still exists.

some other trees also going to dead. how to avoid that. I heard in website, if we want to cultivate we need to maintain pH level 4.0-6.0. how to maintain it and how to avoid root dead?

  • Do you want to increase or decrease the ph? In your other question you mentioned lots of rain, which led me to believe you had an acid soil, which should be in the range of 4-6 ph already.
    – Randy
    Aug 5, 2013 at 3:46
  • yeah, its right. Randy. I told you its hill area.so, there is rainfall already. but these days the rainfall went low compare to five years back. so, I thought this could be a reason the plant couldn't maintain its PH level. that why asked how to maintain PH if there no usual rainfall. ?
    – Dineshcool
    Aug 5, 2013 at 3:51

1 Answer 1


Watch this video to understand what ph is http://www.youtube.com/watch?v=1YOeqRiG-3Y

Ph is simply a measure of H+ ions in the soil solution. If you have a lot of H+ ions, then you have an acid soil. If you have a lot of H+ ions, then you have little Ca++, Mg++, K+, NH4+, etc, etc because H+ has displaced them. So, acid soil really means deficient soil.

It is true that having a low ph in the soil can discourage some root diseases (particularly in potatoes), but also having low ph means you have little nutrients for plant growth unless the plant has evolved in an acid soil (blueberries, azaleas, etc).

If you have the proper amounts of Ca++, Mg++, K+, etc in the soil, then ph is not something you'd ever have to worry about. Ph is the effect of cation combinations in the soil, not the cause.

Here are a couple good articles explaining why the ideal soil should be around 70% Ca, 10% Mg, 5% K

http://www.soilminerals.com/Cation_Exchange_Simplified.htm http://www.acresusa.com/toolbox/reprints/Feb07_CationAnionConnection.pdf

As to how to maintain the ph at a certain level... if you wish to lower ph, you would add H+ ions. Organic matter does this, as does many fertilizer salts. If you wish to raise ph, then you use lime or simply add the Ca++, Mg++, and K+ back to the soil that the H+ ions displaced.

Calcium is used by plants to build cell walls. Potassium is associated with disease resistance. Having leaves which look as those do, one may question the availability of calcium and potassium in the soil.

That disease on your leaves looks similar to the fire blight disease on my pear trees which I've successfully used calcium to treat. I am of the opinion that most diseases are caused by nutritional deficiencies in the soil, though the mechanism for decay may be bacterial or fungal, the cause is actually something missing from the soil.

  • Nice Randy. much appreciated explanation
    – Dineshcool
    Aug 5, 2013 at 4:56
  • Very glad to help. I hope things improve for you with your pepper crops.
    – Randy
    Aug 5, 2013 at 5:00
  • nice to hear from you. I will do it..
    – Dineshcool
    Aug 5, 2013 at 6:09

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