По тексту найти слова Crop production depends on land and its productivity. The cropland varies both from one region to another and within each region. Soils are the most important natural resources. Farming destroys them to some extent, removing the essential plant-food elements and exposing soils to the effects of erosion. The latter is the result of wind and water. Erosion lowers productive value through the loss of the soil itself and removal of nutrients and organic material. Better land use means first of all soil conservation. It includes measures for controlling erosion, proper rotations to increase the organic matter, the application of fertilizers and manure, proper tillage methods as well as drainage and irrigation practices. The better the soil, the higher the yield. But yields are affected by many other factors as well. Among them are high-quality seeds of the crops adapted to the climatic and soil conditions, application of fertilizers, good preparation of the land, proper rotations, drainage and irrigation, timely planting, cultivating and harvesting. Of all agricultural practices affecting yields seedbed preparation is the most important. Plowing is the first step in seedbed preparation. The right kind of preparing a seedbed is to get a fine moist and mellow soil. Good crop rotations keep up the productivity of the soil. A rotation usually includes a grass-farming crop, especially one that includes legumes to add nitrogen and increase the organic matter of the soil, a cereal and a cultivated crop, at which time manure and fertilizers can be applied. Well-planned rotations increase the supply of organic matter, which has such a good effect on the physical condition of the soil. Find the words, denoting the following. 1. An action that destroys the soil. 2. Agricultural plants in the fields. 3. Components of food. 4. Something that is applied for soil improvement. 5. Growing different crops in a definite order on the same land. 6. Soil prepared for seeding. 7. Plants growing where they are not wanted. 8. The method of sowing with a drill.