Soil pH: A basic Idea

In some of my earlier articles I have mentioned about pH and the ideal pH for a particular plant. But many starters are not aware of this technicality. So I decided to demystify the jargon in this article.

Soil pH is the measure of how acidic or how alkaline your soil is. It is actually to measure the concentration Hydrogen ions in the solution. It is measured in a scale of 0 to 14. Where 0 being the most acidic and 14 is the most alkaline and 7 stands for neutral. To give you an example lemon juice can be of the range of 2 to 3 signifies very acidic where as baking soda can be of a pH of 8 to 9 which means it is very alkaline. The fresh clean drinking water is of pH 7.

This pH is calculated on the logarithm scale so a difference between one point is equal to 10 times acidity. i.e, the pH of 6 is 10 times more acidic than pH 7 and 10 times less acidic than pH 5.

Now you must be wandering about why pH is so important to your plant? Lets see why. The pH of the soil has a very big role in plant growth and its survival. Though it is not a nutrient, it controls the availability of the nutrients to the plant. So it does not matter how much nutrient you put into the soil, if it can not get absorbed by the plant it is of no use. For example a soil pH of 6 or more can inhibit the absorption of calcium, magnesium, phosphorus, potassium etc. where as a soil pH of 7.5 or more can reduce the amount of Iron, Zinc, Copper, Manganese. A soil pH of less than 4 can be full of toxic amount of Aluminum or Manganese.

Now the good news. The soil pH is not fixed. You can change it to your plant’s liking. The soil pH is dependent on your local climate. You can get the idea by looking at the plants in your locality. Generally it is found that in high rainfall areas the soil pH is acidic. Plant like blueberries flourish in these areas. Where as typically low rain fall areas in the world is generally contains alkaline soil. Plants like olive or pomegranate do well in those areas.

It is best to test your soil pH before you start planting. You can get the required instruments in your local garden shops. You can also contact any professional to do it for you.

If your soil is too acidic and you want to reduce the acidity and increase the pH, agricultural lime or dolomite can be a good option to be added with the soil. Generally agricultural lime is cheaper than dolomite. In case your soil is deprived of magnesium then add dolomite otherwise lime would be fine.

In case your soil is far more alkaline and you want to decrease the pH, add peat moss or compost. Adding these organic material can definitely beneficial than adding ammonium sulfate or other inorganic sulfates.

I hope this clears the doubts surrounding the pH and its effect. Do post your comments.