chong

Okay, Benny - that's great. Unfortunately, your quoted excerpt does not show up on the actual post, but I was able to read it below the reply box while I was typing my reply and was verifying what you wrote. The first paragraph had some weird numbering system(from 5 to 19) at the beginning of each line, and they seemed unrelated to the paragraph. Anyway, I was able to read it. It appears that your meter has the feature to be calibrated. Does your meter require that you mix equal parts of water and soil in a bucket, or stick it directly into the soil?

I don't think it's wrong to assume that adding Iron and/or Nitrogen as a cure when your citrus leaves are yellowing because that's what most references will advocate. And in my experience, that appears to be so. Yes, adjustment of pH to an optimum level is important to the health of the plant. But from what I read, low pH affects the growth of the plant, but seldom is the result manifested by the yellowing of the leaves. Low soil pH often results in a plant that looks healthy and green but slow to grow and produce little fruit, if at all. I've haven't heard it resulting in yellowing of the leaves.

Now that you've gotten me to look at pH levels. It just occurred to me that my Philippine Magnolias are very slow growing and seldom bloom. Hmmmm, I have to check their soil pH. My Michelias (see avatar) are doing great, but one of the bigger plants' leaves were yellowing last month. I applied some Miracid and it is now on the green side. It looked like pale sunflower yellow before.

Out of curiosity, what is the pH of your tap water? In a lot of places in CA that I've stayed in, the water is so soft that it was difficult to get rid of soap suds/film when washing or taking a shower.