The pH scale is a scale of value for the itogree of acidity or alkalinity of a soil. Soils below 7 are regarded as being acid, those above 7 as alkaline. A pH value of 7 indicates a neutral soil and an ideal garden reading is 6.5. Below 6 on the agile the extreme acidity of the soil makes it sai:able only for acid-loving plants such as lithers and rhododendrons. A reading above 8 means that the soil is so alkaline that it will support few plants, due to essential foods being 'locked up' in the soil. However certain plants, such as carnations, sweet peas and onions, do prefer alkaline conditions.
The topsoil is the essential layer for plant growth. Its texture and composition generally depend upon the parent rock from which it has very gradually been formed, by the interaction of water, climate and vegetation. Weathering agents such as frost, rain and sun break the rock down over thousands of years to form the basic mineral structure of the soil. Plants grow on the rock debris and myriads of microorganisms work on the dead roots and fallen leaves to decay them, producing the essential organic constituent of the topsoil, known as humus.
As children leave home the garden area should become quieter and parents should have more time to spend in it. They may concentrate more on the plants themselves, possibly with special interests developing such as roses or a greenhouse. However, what can be looked after with ease at fifty becomes something of a chore at seventy.
The depth of topsoil varies. A site recently left by a builder may have no topsoil at all (or it may be covered by the subsoil layer), while in parts of the Mississippi Basin the rich alluvial deposits are 6 m (about 20 ft) deep. The average garden has between 300 mm and 600 mm (1 ft and 2 ft) of topsoil, but a depth of as little as 150 mm (6 in) is sufficient for growing a large number of plants. You can test the depth of topsoil by the use of a soil auger, a tool like a giant corkscrew, which will bring up a sample of the soil profile, the several layers from which it is formed. A simpler test is to dig a hole with steep sides and so make the soil profile visible in that way. The hole will also show you how quickly the top- or subsoil drains after rain.
In the family life cycle of a garden use can grow and expand and then sl reduce its scope again. The demands may vary from, at one extreme, provide a tranquil retreat after a noisy day wor in town to creating the need for phys exercise in otherwise sedentary lives.
Between topsoil and parent bed rock there may be many layers of stone and gravel, but the layer immediately beneath the topsoil is generally the subsoil. Its depth varies according to the hardness of the underlying rock and the amount of erosion it has suffered. The colour and texture of subsoil are usually different from those of the topsoil because it is in a transitional stage, without humus or organic material. For this reason, it is not a growing medium.
The topsoil is the essential layer for plant growth. Its texture and composition generally depend upon the parent rock from which it has very gradually been formed, by the interaction of water, climate and vegetation. Weathering agents such as frost, rain and sun break the rock down over thousands of years to form the basic mineral structure of the soil. Plants grow on the rock debris and myriads of microorganisms work on the dead roots and fallen leaves to decay them, producing the essential organic constituent of the topsoil, known as humus.
As children leave home the garden area should become quieter and parents should have more time to spend in it. They may concentrate more on the plants themselves, possibly with special interests developing such as roses or a greenhouse. However, what can be looked after with ease at fifty becomes something of a chore at seventy.
The depth of topsoil varies. A site recently left by a builder may have no topsoil at all (or it may be covered by the subsoil layer), while in parts of the Mississippi Basin the rich alluvial deposits are 6 m (about 20 ft) deep. The average garden has between 300 mm and 600 mm (1 ft and 2 ft) of topsoil, but a depth of as little as 150 mm (6 in) is sufficient for growing a large number of plants. You can test the depth of topsoil by the use of a soil auger, a tool like a giant corkscrew, which will bring up a sample of the soil profile, the several layers from which it is formed. A simpler test is to dig a hole with steep sides and so make the soil profile visible in that way. The hole will also show you how quickly the top- or subsoil drains after rain.
In the family life cycle of a garden use can grow and expand and then sl reduce its scope again. The demands may vary from, at one extreme, provide a tranquil retreat after a noisy day wor in town to creating the need for phys exercise in otherwise sedentary lives.
Between topsoil and parent bed rock there may be many layers of stone and gravel, but the layer immediately beneath the topsoil is generally the subsoil. Its depth varies according to the hardness of the underlying rock and the amount of erosion it has suffered. The colour and texture of subsoil are usually different from those of the topsoil because it is in a transitional stage, without humus or organic material. For this reason, it is not a growing medium.
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