염분이 있는 토양과 염분이 없는 토양에서 자란 씨앗을 비교해 보고 어떤 곳에서 씨앗이 잘 자라는지 알아본다.
2 plastic cups, Cotton wool, 10 bean seeds, Salt
1. Cover the bottom of two cups with cotton wool.
2. Sprinkle some salt over the bottom of one cup. Label this cup 'salt added'.
3. Place five seeds in each cup. It helps if you place the seeds with their grooved side upwards.
4. Wet the cotton wool in both cups and put in a light place.
5. Keep the seeds moist - you can cover the cups with clear plastic wrap to prevent the seeds from drying out.
6. Observe the seeds growing for a few more days. What difference do you see?
Within four or five days, the seeds should begin to grow. Which seeds begin to grow first - the seeds with or without salt? As you can see the seeds without salt grow well. The increasing amount of salt in the soil (salination) is one of Australia's biggest environmental problems. In 1990, 50 000 square kilometres of land were affected by salinity. This area is almost the same as the whole state of Tasmania! Salts occur naturally in the soil and are carried by water. If the underground water level is close to the surface, the soil becomes too salty for many plants to grow. Tree planting programs can help reduce this problem. So too can the planting of crops which grow well in salty soils (salt tolerant).
- 소금이 없는 토양에서 씨앗이 잘 자라는 것을 볼 수 있게 된다. 호주의 타즈마니아는 전 지역이 염분에 영향을 받아 토양에 염분이 증가하고 있어 식물이 자랄 수가 없다고 한다.