1. Выучите значение опорных слов:

to assist – помогать; content – содержание, составляющая; desirable – желаемый; crop production – производство с/х культур; heat – жара; to rich in – обогащать, насыщать; artificial – (зд.) минеральный; to supplement – поставлять; available – доступный; capacity – способность; absorption – всасывание, поглощение; addition – добавка; tight soil – твердая почва; air circulation – аэрация; crust – корка; abundant – обильный; to contribute – вносить, вкладывать; tangled mass – почва, смешанная с органическими остатками растений; A-horizon – гумусовый горизонт А; to bind – связывать; to fluctuate – колебаться; application – применение; manure – навоз; excessive cultivation – чрезмерная обработка пашни.

2. Переведите следующие пары антонимов:

sufficient – insufficient, consider – reconsider, decomposed – undecomposed, agree – disagree, proper – improper, efficient – inefficient, definite – indefinite.

3. Составьте из приведенных слов пары синонимов.

limited, rotten, manure, strict, delay, decomposed, organic fertilizer, to be late.

4. Образуйте существительные от следующих глаголов:

to tangle, to contribute, to circulate, to reduce, to raise, to manure, to delay.

5. Определите, к какой части речи относятся следующие слова:

can, horizon, means, only, decomposed, exeptional, below, tillage.

6. Заполните пропуски в предложениях, используя следующие слова: decomposition, undecomposed, decomposing, decomposed.

1. … organic matter protects plants against cold and heat. 2. Proper ... of organic matter is essential for improving soil fertility. 3. Organic matter is of the greatest value in the period when it is ... 4. Poor soils show improvement when ... organic matter is added.

7. Заполните пропуски соответствующими предлогами.

1. The addition … organic matters is particularly important … the early stages … plant growth, … the time … seed germination.

2. Some … the essential nutrients … plant growth come directly … organic matter.

8. Заполните пропуски в предложениях, используя следующие слова: ease of cultivation, soil erosion, essential, abundant, break down, crusts, tillage, parental rock.

1. Organic matter reduces … .

2. Soil with … organic matter shows little tendency to form … when they dry out after rains.

3. Some of the … nutrients for plant growth come directly from organic matters.

4. Organic matter not only contribute to the … but it also reduces the delay of … after rains.

5. Chemicals perform several functions, the most important is to … some of the minerals of the … making them available to plants.

9. Ответьте на следующие вопросы:

1. What are the main functions in the soil?

2. How can droughty soils be improved?

3. How can decomposed organic matter be called?

4. How many percent of organic matter does a farmed soil contain?

5. Does the organic matter content fluctuate between relatively narrow limits?

Грамматические упражнения.

1. Образуйте 3 формы от следующих глаголов:

to have, to assist, to provide, to build, to reduce, to show, to fly.