Muhammad Arif Khan wrote:LOWERING PH OF SOIL
Two materials commonly used for lowering the soil pH are aluminium sulphate and sulphur. These can be found at a garden supply centre.
I have had problem finding various chemicals/fertilizer formulations/nutrients often mentioned in our discussions, in the garden supply stores in Rawalpindi/Islamabad ( main & oldest being Awan Seeds Store),other than common ones,ie. Urea, DAP, NPK(only 1-3 ratios)& Potash-that too in their own unlabeled packets. May be those used for agriculture( crops/orchards)also are sold at Agriculture Stores, but I am not sure about what all they sell. Therefore, these questions:
. Where to find these,including Ammonium (?) Sulphate & Sulphur,mentioned above ? At some chemicals/scientific stores?
. What are the various common fertilizers,besides Urea,DAP & NAP(20-20-20) sold in other main markets,eg Lahore; any off hand listing?
. Is it possible to prepare some of the formulations as DIY, eg various NPK ratios etc ?
. You had probably mentioned in the past about preparing own fertilizer formulations.Kindly mention its link,if you can remember.
You can use the following tables to calculate the application rates for both the aluminium/Iron sulphate and the sulphur. The rates are in pounds per 10 square feet for a loamy soil. Reduce the rate by one-third for sandy soils and increase by one-half for clays.
Pounds of Aluminium/Iron Sulphate to Lower the pH
Present pH Desired pH
XXX6.5 6.0 5.5 5.0 4.5
8.0 1.8 2.4 3.3 4.2 4.8 Pounds/10 square feet
7.5 1.2 2.1 2.7 3.6 4.2
7.0 0.6 1.2 2.1 3.0 3.6
6.5 - 0.6 1.5 2.4 2.7
6.0 - - 0.6 1.5 2.1
6.5 - 0.1 0.2 0.3 0.4
6.0 - - 0.1 0.2 0.3
Difficult to understand so many figures in one line; could they be labelled/explained please?