Healthy plants should be able to get all of the nutrients they need from the soil.
But if your soil is too acidic or too alkaline, those nutrients won’t be available, no matter how much fertiliser you add.
Acidity has a strong effect on the ability of plants to take up soil nutrients as well as upon the wellbeing of soil organisms.
pH is a measure of the acidity vs the alkalinity of the soil, and determines the capacity of that soil to exchange nutrients with plants growing in it.
pH is usually measured on a scale of 1-14:
– A pH of 7 indicates neutral soil
– A pH above 7 indicates alkaline soil
– A pH below 7 indicates acidic soil
So it depends what you’re growing as to what pH you want to nudge your soils towards. Keep in mind that most annual veggies prefer a bacterially dominated soil, which is leaning towards a pH of 7 – 7.5
How to test your soil with a simple soil ph test kit:
Firstly, get your hands on a soil pH test kit. These can be got from garden centres, or online.
– Take several measurements in different spots in the garden. A minimum of six samples from different parts of your garden is a safe amount.
– Test your soil annually to know exactly what your garden’s nutritional requirements are.
Read full instruction in this link.