EXCERCISES 8 Find the questions to these answers. It means removing the excess water from the soil in order to enhance crop production. They are land levelling and the construction of ditches or waterways which can allow the water to leave the field. Water is removed through a network of perforated tubes, called “drain tiles”, installed below the soil surface. The increase in crop production and the improvement of aeration and soil nitrogen, which will result in earlier germination and better root development. Yes, the concentrations of salts, nutrients and other chemicals in drainage discharge can damage aquatic and terrestrial ecosystems. Nitrogen is responsible for eutrophication in the receiving water bodies. 1. 2. 3. 4. 5. 6. Eutrophication 9 Watch the video and say if the following statements are true or false. Correct the false ones. Eutrophication happens if there is a lack of nutrients in a water body. ☐ T ☐ F If algal bloom absorbs sunlight, it can’t reach the bottom of the water body. ☐ T ☐ F Plants can’t photosynthesise without light. ☐ T ☐ F When algae run out of nutrients, they die. ☐ T ☐ F Dead plants and algae are affected by bacteria. ☐ T ☐ F A continuing supply of food to bacteria accelerates their reproduction. ☐ T ☐ F Water is anoxic if there is too much oxygen. ☐ T ☐ F Anoxic water is beneficial to fish. ☐ T ☐ F 1. 2. 3. 4. 5. 6. 7. 8. FuseSchool – Global Education INSERIRE VIDEO: What is eutrophication | Agriculture | Biology | FuseSchool posted by 10 Complete the crossword. It is important to take it into account when choosing a drainage system. They can damage aquatic ecosystems. It is reduced by better root systems. Money spent in the hope of a return (e.g. when installing a drainage system). Kind of drainage which removes excess superficial water. What tubing may be made of. It is improved by drainage. Across 1. 4. 5. 6. 9. 10. 11. Clay pipe. It causes eutrophication. Opposite of intensifying. They can allow water to leave the field. It can be controlled if a drainage system is installed. The environment could be damaged by a high concentration of them. Down 1. 2. 3. 5. 7. 8. GLOSSARY : : : : : : : : : : : : crop yields rendimento del raccolto eutrophication eutrofizzazione huge enorme in spite of nonostante leaching lisciviazione length pezzo levelling livellamento mitigative lenitivo shallow poco profondo tile coppo timely al momento opportuno waterlogging ristagno d’acqua