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SOIL MANAGEMENT
Soil management involves six essential practices: proper tillage; maintenance of a proper supply of organic matter in the soil; maintenance of a proper nutrient supply; control of soil pollution; maintenance of the correct soil acidity; and control of erosion.
Tillage
The purpose of tillage is to prepare the soil for growing crops. This preparation is traditionally accomplished by using a plough that cuts into the ground and turns over the soil. This removes or kills any weeds growing in the area, loosens and breaks up the surface layers of the soil, and provides a bed of soil that holds sufficient moisture to permit the planted seeds to germinate. Traditional tillage may harm the soil if used continuously over many years, especially if the fertile topsoil layer is thin. Today, many farmers use a program of minimum or reduced tillage to conserve the soil.
Among the secondary but important benefits of tillage is the aeration resulting from pulverization. This aeration not only provides a freer circulation of oxygen and water but also results in increased biological activity in the soil, including that of organisms that fix atmospheric nitrogen. Tillage contributes to the health of plants by inhibiting plant diseases and by discouraging the development of various types of insects that harm plants.
Supply of organic matter
An acre of living topsoil contains approximately 900 pounds of earthworms, 2,400 pounds of fungi, 1,500 pounds of bacteria, 133 pounds of protozoa, 890 pounds of arthropods and algae, and even small mammals in some cases. Soil also contains dead organisms, plant matter, and other organic materials in various phases of decomposition. Humus, the dark-coloured organic material in the final stages of decomposition, is relatively stable. Both organic matter and humus serve as reservoirs of plant nutrients; they also help to build soil structure and provide other benefits.
Organic matter and humus are terms that describe different but related things. Organic matter refers to the fraction of the soil that is composed of both living organisms and once-living residues in various stages of decomposition. Humus is only a small portion of the organic matter. It is the end product of organic matter decomposition and is relatively stable. Humus contributes
to well-structured soil that, in turn, produces high-quality plants.
Practically all the soil organisms depend on organic matter as their food source. Therefore, to maintain their populations, organic matter must be renewed from plants growing on the soil, or from compost. When soil livestock are fed, fertility is built up in the soil, and the soil will feed the plants. Rich organic matter and humus levels help to maintain favourable conditions of moisture, temperature, nutrients, pH, and aeration.
Nutrient supply
The nutrients most necessary for proper plant growth are nitrogen, potassium, phosphorus, iron, calcium, sulphur, and magnesium, all of which usually exist in most soils in varying quantities.
In addition, most plants require minute amounts of substances known as trace elements, which are present in the soil in very small quantities and include manganese, zinc, copper, and boron. Nutrients often occur in the soil in compounds that cannot be readily utilized by plants.
Match the sentences to make the summary of the text.
1. Soil management includes some practices:
2. Humus is the result of organic matter decomposition
3. Organic matter and humus also help
4. To maintain the populations of soil organisms, organic matter must be
5. Traditional tillage may damage the soil,
6. Secondary benefits of tillage is
7. Practically all the soil organisms depend on
8. Both organic matter and humus serve as
9. The nutrients necessary for proper plant growth are
10. Today, many farmers use a program of minimum
11. Organic matter is composed of both
12. Rich organic matter and humus levels help
a) especially if the fertile topsoil layer is poor.
b) reservoirs of plant nutrients.
c) or reduced tillage to save the soil.
d) aeration which provides a circulation of oxygen and water.
e) living organisms and once-living residues in various stages of decomposition.
f) to provide favourable conditions of moisture, nutrients, pH, and aeration.
g) proper tillage, supply of organic matter and nutrient, control of soil pollution and erosion.
h) renewed from plants growing on the soil, or from compost.
i) organic matter as their food source.
j) to build soil structure and provide other benefits.
k) and is relatively stable.
l) nitrogen, potassium, phosphorus, iron, calcium, sulphur, and magnesium.
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SOIL MANAGEMENT
Soil management involves six essential practices: proper tillage; maintenance of a proper supply of organic matter in the soil; maintenance of a proper nutrient supply; control of soil pollution; maintenance of the correct soil acidity; and control of erosion.
Tillage
The purpose of tillage is to prepare the soil for growing crops. This preparation is traditionally accomplished by using a plough that cuts into the ground and turns over the soil. This removes or kills any weeds growing in the area, loosens and breaks up the surface layers of the soil, and provides a bed of soil that holds sufficient moisture to permit the planted seeds to germinate. Traditional tillage may harm the soil if used continuously over many years, especially if the fertile topsoil layer is thin. Today, many farmers use a program of minimum or reduced tillage to conserve the soil.
Among the secondary but important benefits of tillage is the aeration resulting from pulverization. This aeration not only provides a freer circulation of oxygen and water but also results in increased biological activity in the soil, including that of organisms that fix atmospheric nitrogen. Tillage contributes to the health of plants by inhibiting plant diseases and by discouraging the development of various types of insects that harm plants.
Supply of organic matter
An acre of living topsoil contains approximately 900 pounds of earthworms, 2,400 pounds of fungi, 1,500 pounds of bacteria, 133 pounds of protozoa, 890 pounds of arthropods and algae, and even small mammals in some cases. Soil also contains dead organisms, plant matter, and other organic materials in various phases of decomposition. Humus, the dark-coloured organic material in the final stages of decomposition, is relatively stable. Both organic matter and humus serve as reservoirs of plant nutrients; they also help to build soil structure and provide other benefits.
Organic matter and humus are terms that describe different but related things. Organic matter refers to the fraction of the soil that is composed of both living organisms and once-living residues in various stages of decomposition. Humus is only a small portion of the organic matter. It is the end product of organic matter decomposition and is relatively stable. Humus contributes
to well-structured soil that, in turn, produces high-quality plants.
Practically all the soil organisms depend on organic matter as their food source. Therefore, to maintain their populations, organic matter must be renewed from plants growing on the soil, or from compost. When soil livestock are fed, fertility is built up in the soil, and the soil will feed the plants. Rich organic matter and humus levels help to maintain favourable conditions of moisture, temperature, nutrients, pH, and aeration.
Nutrient supply
The nutrients most necessary for proper plant growth are nitrogen, potassium, phosphorus, iron, calcium, sulphur, and magnesium, all of which usually exist in most soils in varying quantities.
In addition, most plants require minute amounts of substances known as trace elements, which are present in the soil in very small quantities and include manganese, zinc, copper, and boron. Nutrients often occur in the soil in compounds that cannot be readily utilized by plants.
Match the sentences to make the summary of the text.
1. Soil management includes some practices:
2. Humus is the result of organic matter decomposition
3. Organic matter and humus also help
4. To maintain the populations of soil organisms, organic matter must be
5. Traditional tillage may damage the soil,
6. Secondary benefits of tillage is
7. Practically all the soil organisms depend on
8. Both organic matter and humus serve as
9. The nutrients necessary for proper plant growth are
10. Today, many farmers use a program of minimum
11. Organic matter is composed of both
12. Rich organic matter and humus levels help
a) especially if the fertile topsoil layer is poor.
b) reservoirs of plant nutrients.
c) or reduced tillage to save the soil.
d) aeration which provides a circulation of oxygen and water.
e) living organisms and once-living residues in various stages of decomposition.
f) to provide favourable conditions of moisture, nutrients, pH, and aeration.
g) proper tillage, supply of organic matter and nutrient, control of soil pollution and erosion.
h) renewed from plants growing on the soil, or from compost.
i) organic matter as their food source.
j) to build soil structure and provide other benefits.
k) and is relatively stable.
l) nitrogen, potassium, phosphorus, iron, calcium, sulphur, and magnesium.
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