Choosing Soil for Plants (III)
9. pH between 5.5 and 8
Fortunately 80% of soils are between these values, but if a pH above or below, you should fix it. The methods for measuring pH have them on this page.
a) If the soil was very acidic (pH <5.5) in short supply essential plant nutrients such as calcium, magnesium, phosphorus, boron and molybdenum and the structure is usually not good.
Improved: the pH is raised incorporating ground limestone.
Dose: 15-20 pounds per 100 square feet to bring in the autumn and is buried styling. b) If the soil is neutral (pH between 6.5 and 7), perfect, there is an optimal availability of all the plants normally required. While some called acidophilic, they prefer less than 6.5, and others (calcareous) are happy with a pH above 7. c) If the soil is basic or alkaline (pH> 
is likely a shortage of Iron, Manganese, Zinc, Copper and Boron, and Acidophilus and other plants susceptible to these shortcomings, such as orange, hibiscus, etc. , yellow and few flowers will unless you modify the pH. The most typical example is that of iron deficiency (iron chlorosis).
»Upgrade: to lower the pH and nutrients are released and can be insolubilized do the following (your choice):
Iron sulphate
Iron sulfate is a cheap and readily available. To give the floor buy it in granular form (brown) rather than fine particles such as glass (green apple).
Iron sulfate to acidify and additionally serves to provide some iron, but not much, and its main function is to lower the pH.