2. Can wheat be grown successfully on clay soil?
3. What seedbed is essential for wheat?
4. What do the time and method of seedbed preparation depend on?
5. What soil conserves moisture better?
6. Why is the rate of seeding wheat a very complicated, problem?
7. What is the relationship between the amount of rain-fall and the rate of seeding?
8. What are the advantages of drilling?
9. How is wheat harvested?
10. When is wheat ready for combine harvesting?
5. Read text B without a dictionary and paragraph it. Title each paragraph.
TEXT B
Man cannot influence climatic conditions. However, with new progress in science, crop production can be controlled by applying improved farming practices. So, the farmer cannot regulate the amount of rainfall, but he can prevent loss of moisture by proper cultivation and by incorporating into the soil large amounts of organic matter which helps conserve moisture. In some areas irregularities in rainfall and lack of moisture are compensated by irrigation. Proper temperature is also essential for successful plant growth. In addition it helps conserve water in the soil. So, some plants grow best in cool climates not only because of direct effect of temperature, but due to higher supply of water under such conditions. Wind is another climatic factor influencing crop production. The farmer cannot control the wind, but he can farm his land in such a way as to lose as little soil as possible due to wind erosion. He can plant winter crops in areas where they will mature before dry, hot windy weather becomes a problem the next summer. Sunlight is highly important for many processes taking place in the growing plant. There exists a relationship between length of day and the flowering and fruiting of plants. Some plants produce flowers only when days are long and nights are short. They are called long-day plants. Some plants produce flowers and fruit in autumn when days are short and nights are long. They are called short-day plants. Some plants are not likely to be affected by the length of the day. Crops vary in their climatic requirements. Corn can be grown under a variety of climatic conditions, the most favourable environment being the one where the average summer temperature is between 70° and 80° F. Wheat sown in the fall does best in regions where the climate is cool and moist during the fall, winter and early spring months followed by warm and dry harvest period. Low yields may often result from too low temperatures and abnormally dry weather. Like potatoes, oats and barley do best in cool, moist climate. Both quality and yield of potatoes are better in cool regions. Vegetables, because of their high adaptability, are grown under different soil and climatic conditions, soils of good physical properties being especially important. To obtain high yield of a good quality crop it is necessary to select a proper variety best adapted to the conditions of the region it is to be grown in.
UNIT 17. CORN
| In this unit you will learn: | Grammar focus : - Неполные придаточные предложения Vocabulary focus Reading and comprehension focus: - Text A. Corn. - Text B. Listening and speaking focus |
Grammar Focus