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9.5 Choose the right statement:

1) The darker the soil, the less organic matter is present in it.

  1. Lack of moisture is the main limiting factor in crop growing.

  2. High wind speed is a concern in soil erosion.

  3. Dark colour of soil depends on the present oxidized iron.

  4. The abundance of vegetation adds more organic matter to the soil.

  5. Gray soils are less fertile than black soils.

  6. Forest soils are the best for the crop production.

9.6 Fill in the gaps using the words given below the text:

In practical farming, the two main types of … are light soils and heavy soils. … soils are easy to work, need less … to cultivate, can be worked at most times of the year, and do not hold water so much. Sands and gravels belong to this group. … soils are more difficult to work, need much more power … , can only be worked at certain times when they are in the proper condition, and hold water. They are usually more … and grow heavier crops. Heavy soils usually contain much … .

Heavy, soil, to cultivate, productive, light, clay, power.

Unit VI Soil chemistry Active vocabulary

acid

кислый, кислотный

alkaline

щелочной

artificial

искусственный

to avoid

избегать

to apply

вносить, применять

to contain

содержать

compounds

смесь, соединение

contaminant

загрязнитель

to decompose

разлагаться, гнить

deficiency

недостаток, нехватка

environment

окружающая среда

essential

существенный, необходимый

fertilizer

удобрение

harmful

вредный, опасный

to leach

выщелачивать, вымывать

to maintain

поддерживать, сохранять

nutrient

питательное вещество

nitrogen

азот

oxygen

кислород

potassium

калий

PH value

кислотно-щелочной баланс

soluble

растворимый

waste

отбросы, отходы

to weather

выветривать(ся), подвергать(ся) атмосферным влияниям

Text 1 Chemical Properties of Soil

1.1 Read the following international words and translate them: climate, elements, deficiency, critical, commercial, opposite, absorb, products, mineral, organic, cultivate, concentration, symbolically, potential, effective.

1.2 Read the following words: oxygen, silicon, aluminium, iron, nitrogen, phosphorus, potassium, acidity, alkalinity, carbon dioxide, hydrogen, hydroxyl, ion, ionization, water solution, neutral, molecules, trace elements.

1.3 Translate the following sentences; pay attention to grammar

  1. These have been referred to as trace elements, because the amount present in the soil can neither be estimated nor determined very accurately.

  2. Neutral soils are neither acid nor alkaline.

  3. Most plants, particularly most cultivated crops, will not tolerate a high degree of either acidity or alkalinity.

  4. The hydrogen molecules that have not yet ionized are held to the surfaces of the solid particles of clay and organic matter.