Группа 1714. Урок 16.

1. Think of the questions to which the following sentences are answers:

1. 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.

2. The purpose of tillage is to prepare the soil for growing crops.

3. Among the secondary but important benefits of tillage is the aeration resulting from pulverization.

4. Traditional tillage may harm the soil if used continuously over many years.

5. An acre of living topsoil contains approximately 900 pounds of earthworms.

6. Soil also contains dead organisms, plant matter.

7. Humus is only a small portion of the organic matter.

8. Rich organic matter and humus levels help to maintain favourable conditions of moisture, temperature, nutrients, pH, and aeration.

9. The nutrients most necessary for proper plant growth are nitrogen, potassium, phosphorus, iron, calcium, sulphur, and magnesium.

10. Trace elements include manganese, zinc, copper, and boron.

2. Ответьте на вопросы по содержанию текста “Soil Management”.

1. What practices does soil management include?

2. What is the purpose of tillage?

3. What are advantages and disadvantages of tillage?

4. What does living topsoil contain?

5. What is humus?

6. What role has the organic matter?

7. Why are nutrients necessary?