Solving Citrus Problems
How to diagnose common citrus problems, with tips on how to resolve them.
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Some soils are better for growing plants than others. The terms rich and poor, good and bad, fertile and infertile are commonly used to describe these differences. The quality of the soil in your garden largely depends on the type of parent rock from which it is formed, on the influence of climate over hundreds of thousands of years and on what your house builder and previous owners have done to it. It is remarkable how much poor soils can be improved if you learn to manage them properly.
Soil is made up of mineral particles which vary in shape, size and chemical composition. Sand particles are quite large because they break down slowly. Other minerals break down more quickly into clay particles. These are extremely small – many thousands of times smaller than coarse sand – and they have an important effect on the physical and chemical properties of the soil. The size of the particles – coarse sand, fine sand, silt and clay – and the proportions in which they occur determine soil texture.
Sandy soils
Sandy soils have large particles with large spaces, called pore spaces, between them. They drain readily, have good aeration and are easy to cultivate. For this reason they are often called ‘light’ soils. However, very sandy soils are less effective at retaining water and nutrients than other soil types.
Clay soils
Clay soils have small particles and little pore space. They store water well, often too well for good drainage and aeration, and retain plant nutrients. Clay particles attract and hold nutrients on their surface. Clay soils can be difficult to cultivate and are often called ‘heavy’.
Loams
All soils between the extremes of sand and clay are referred to as loams. They are mixtures of coarse and fine particles. They are divided into such categories as sandy loam (more sand than clay) and clay loam (more clay than sand). You can identify the soil in your garden by the feel in your hand when the soil is slightly moist.
- Sandy soil does not stick together and is coarse and gritty.
- Sandy loam sticks together, is friable (easily crumbled) and slightly gritty.
- Loam sticks together, is friable and not gritty.
- Clay loam sticks together, is slightly friable but plastic.
- Clay soil sticks together, is not friable, but rather it is plastic and sticky.
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