Lesson 19

Грамматика: 1. Сложноподчиненные предло-

жения (повторение).

2.Парные союзы (повторение).

3.Союзы (союзные слова) и их омонимы.

Задание на дом У I

I. Проработайте в разделе "Грамматика и словообразование" 31 стр. 41.

II. В следующих предложениях выделите условные придаточные; переведите предложения (устно).

1.If the soil contained more organic matter the yield of corn would be much higher. 2. The rate of sowing may be increased, provided the soil is rich in nutrients. 3. The seeds will not germinate unless the soil temperature is proper. 4. If grown for grain on fertile soil rye is usually less profitable than other cereals.

III.Переведите следующие предложения, обращая внимание на бессоюзное присоединение определительных придаточных предложений (устно).

1. The yield the new potato variety produces on our poor soil is rather high. 2.Soils potatoes prefer are well-drained sandy loams supplied with enough nutrients end water. 3. Tubers we use for planting are usually cut into pieces. 4. The depth the tubers are planted at varies with the soil type and the equipment used. 5. It is well known that the soil the root crops require should be fertile and deep.

IV. Определите значение слова as в следующих предложениях.

Переведите предложения (устно).

1.As root crops are ligh in sugar and low in protein they do

not supply a balanced diet. 2. As plants grow they require more nutrients and water. 3 In order to grow normally crops should absorb such minerals as calcium, magnesium and sulphur. 4. We have to apply much manure as this soil is too low in organic matter. 5. The nature of the soil

changes as the proportion of clay particles increases.

V. Выделите парные союзы в следующих предложениях. Переведите предложения (устно).

1. Potatoes are mostly grown in areas where the climate is neither too hot nor too dry. 2. Both cut tubers and whole ones can be used for planting. 3«The yield of corn grain is not so high in our region as it is in the South. 4. Spring wheat removes nitrogen in greater amounts than either potassium or phosphorus. 5.The coarser is the seed the deeper it 3hould be sown. 6. Microelements are as important as primary elements.

VI. В последнем абзаце текста А выделите сложноподчинекыые
предложения. Укажите союзы, которые вводят придаточные
предложения.

УП. Переведите текст А (устно). Отработайте чтение текста в лаборатории (лабораторная работа № I).

Text А

ROOT GSOPS

The common feature of root crops is their fleshy underground storage organ. It is the root that these crops are widely grown for throughout the world both in' home

gardans and commercially. Compared to cereal and legume
seeds, food stared in fleshy roots is watery and less concentrated. That is why root crops are not generally easily stored and transported. Most are abundant in carbohydrates and low in protein and oil and hence are useful "energy foods" but do not by themselves supply a balanced diet.Some root crops consumed as fresh vegetables such as car­rots, radishes, onions, etc. are valued both for their flavour and as sources of energy. Sugar beets have been developed for the extraction of sugar while their by-pro­ducts are a valuable food for livestock.

Main factors affecting the growth and best develop­ment of roots are growing-season temperatures, type of soil with a particular reference to its water content, draina­ge, acidity and the available nitrogen supply. As far as temperatura is concerned it should be different stages of growth. Since the size and quality of the root depend on the development of the foliage, comparati­vely high temperatures during the seedling stage permit the development of a large top. Somewhat lower temperatu­res after the tops are fully grown will result in the de­velopment of large, high-quality roots.

As a rule, the best yields of roots are obtained on sandy loams which are not acid and in which the moisture content can be maintained at a reasonable level. With the roots growing underground, a deep seedbed is necessary. When practicable, the land should be plowed in the fall so that it may be worked early in spring. In general the

soil recommended is tho one that is fertile, de<.p and of a texture which 1з easy to work.

In recent years root crop growing has been changed by several new developments. One of them is mechanization which facilitates growing and harvesting roots. Special root drills and mechanical thinners make it possible to eliminate most of hand labour formerly required for root crop production. Weedkillers or herbicides are known to have been developed for controlling weeds in most of the root crops. They can be applied either before plants emer­ge or after they appear. The former method is known as pre—emergence while the later as post-emergence applicati­on. If used with care,the weedkillers are highly effective in maintaining the soil free of weeds and hence in increas­ing root crop yields.

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