2023
St. Louis SHS: 52 points
Ola Girls SHS, Kenyasi: 28 points
St. Joseph SHS: 18 points
QUESTION
What name is given to the ratio of the amount of water stored in the root zone of plants to the amount of irrigation water delivered to the field?
ANSWER: Water storage efficiency
EXPLANATION
Water storage efficiency measures how much of the irrigation water applied actually ends up retained in the root zone where plants can use it, versus water lost to runoff, deep percolation, or evaporation.
PRACTICE QUESTIONS
1. What is irrigation?
ANSWER: The artificial application of water to crops.
2. Name three methods of irrigation.
ANSWER: Surface, sprinkler and drip irrigation.
3. State one advantage of drip irrigation.
ANSWER: It uses water efficiently by delivering it near the roots.
4. What is the root zone?
ANSWER: The layer of soil in which most of the plant roots grow.
5. Name three ways in which irrigation water is lost.
ANSWER: Runoff, deep percolation and evaporation.
6. What is field capacity?
ANSWER: The amount of water a soil holds after excess water has drained away.
7. What is the permanent wilting point?
ANSWER: The soil water content at which plants cannot recover from wilting.
8. Name three kinds of soil water.
ANSWER: Gravitational, capillary and hygroscopic water.
9. What is percolation?
ANSWER: The downward movement of water through the soil.
10. What is waterlogging?
ANSWER: A condition in which the soil is saturated with water and lacks air.
11. How can irrigation lead to salinisation?
ANSWER: Water evaporates and leaves salts behind in the soil.
12. What is irrigation scheduling?
ANSWER: Deciding when and how much water to apply to a crop.