There is no one answer to this. Every location will have a different pH level. Indeed, different parts of the same field might have different pH levels.
The preferred soil pH level for strawberries is 5.8 to 6.2. If the soil is too acidic, add ground limestone to bring the pH level within that range.
Nutrients which are present in soil
pH is important aspect of soil fertility because the level of pH will will influence what kind of organisms that will live in the soil. These can affect how the plants grow since each plant has an optimum pH level in which it will flourish.
Lime does raise the pH level of your soil; however Sulphate is the one that lowers it.
most of the UK has limey soil which has a high pH
Add lime.
The pH leve of soil depends upon it's fertility. If the soil is used to fertilizers or pesticides, it becomes acidic, loses it's fertility and pH level goes down.
This is quite simple. Temperature affects the pH levels in soil because of the heat. Depending on the intensity, the pH level in the soil will either increase or decrease to balance.
The pH scale is used to measure how acidic or basic a soil ranges from 0 to 14. The midpoint which is 7, is neutral. Soil below the pH level 7 is acidic. Soil that is above 7 is basic.
While I cannot give you a properly researched answer, I just did an experiment on this exact same question, and founf that a pH of 6 was the best for bean seeds.
5.5 to 6.5
The optimum pH level for tomato plants is 6.0 - 6.8. You should use a soil tester to determine what the pH level of your soil. The proper pH level will grow much better tomatoes. Rapitest makes a specialized tester just for tomato plants.