4 Chapter 7 Land Supply

6,993 views

Published on

Group 4's Presentation - Empoldering

Published in: Business, Technology
2 Comments
0 Likes
Statistics
Notes
  • Be the first to like this

No Downloads
Views
Total views
6,993
On SlideShare
0
From Embeds
0
Number of Embeds
166
Actions
Shares
0
Downloads
0
Comments
2
Likes
0
Embeds 0
No embeds

No notes for slide

4 Chapter 7 Land Supply

  1. 1. Chapter 7- Land Supply Maximizing the land use for agriculture
  2. 2. Irrigation <ul><li>It means the watering of crops through artificial means. This allows farmers to grow crops in areas that experience water shortage. It also ensures crops receives the right amount of water. </li></ul><ul><li>Water is channeled through irrigation pipes from water sources such as river or lake to places where water is scarce. </li></ul>
  3. 3. Advantages & disadvantages <ul><li>Advantages </li></ul><ul><ul><ul><li>It ensures a steady supply of water, which allows farmers to grow greater amounts and wider varieties of crops. </li></ul></ul></ul><ul><ul><ul><li>Land previously unsuitable are made arable through irrigation. </li></ul></ul></ul><ul><ul><ul><li>It reduces the need of human labours by using computers. </li></ul></ul></ul>
  4. 4. <ul><li>Disadvantages </li></ul><ul><ul><ul><li>Irrigation canals can hold stagnant waters and breed mosquitoes if not properly maintained. </li></ul></ul></ul><ul><ul><ul><li>Land may become waterlogged with poor drainage and crops will be damaged. </li></ul></ul></ul><ul><ul><ul><li>High amounts of dissolved mineral salts from the water of the river used can cause damage to crops. </li></ul></ul></ul><ul><ul><ul><li>Certain irrigation systems are expensive to construct, especially when a dam needs to build across a waterway to create a reservoir. </li></ul></ul></ul>
  5. 5. Terracing <ul><li>In countries where flat arable land is limited, hilly land are used for agriculture. However, steep slopes cause water to run off the slopes and very little water is retained. Also, modern farm machinery is difficult to operate on steep slopes. </li></ul><ul><li>Terracing involves cutting slopes into steps. Low walls called bunds are built at the end of each step. These walls help to slow down the runoff so that it can seep into the soil and be absorbed by plant roots. They also hold water and create the flooded conditions needed for growing crops like padi. </li></ul>
  6. 6. Advantages & disadvantages <ul><li>Advantages </li></ul><ul><ul><ul><li>It is an inexpensive method of increasing the area of arable land. </li></ul></ul></ul><ul><ul><ul><li>Bunds used in terracing prevent soil from being washed away. </li></ul></ul></ul><ul><ul><ul><li>The flat land makes it possible for modern machinery to be used, thus making farming a lot more efficient. </li></ul></ul></ul>
  7. 7. <ul><li>Disadvantages </li></ul><ul><ul><ul><li>Terraces involve a lot of human energy and time, and it is difficult to construct. </li></ul></ul></ul><ul><ul><ul><li>A lot of effort is needed to maintain the terraces after they are constructed. If the bunds are damaged, they may not be able to hold back and cause soil erosion </li></ul></ul></ul>
  8. 8. Soil-less farming <ul><li>Hydroponics and aeroponics are examples of soil-less farming. </li></ul><ul><li>Soil-less farming enables crops to be grown closer together, which maximises land use. </li></ul>
  9. 9. Advantages & disadvantages <ul><li>Advantages </li></ul><ul><ul><ul><li>Plants grown by soil-less farming methods can be grown closer together and hence more crops can be grown on a single area of land at the same time. </li></ul></ul></ul><ul><ul><ul><li>Soil-less farming is found to be effective in increasing the output of crops. This is because sufficient amounts of nutrients can be delivered and distributed evenly to crops at regular intervals. The controlled conditions help to prevent the growth of weeds or insects. </li></ul></ul></ul>
  10. 10. <ul><li>Disadvantages </li></ul><ul><ul><ul><li>Farmers must invest in high technology equipment and specially prepared nutrient solutions for plants, which can be too costly for farmers who do not have enough funds. </li></ul></ul></ul><ul><ul><ul><li>Soil-less farming may not be practical in countries where farmers do not receive enough training to operate the high technology equipment. </li></ul></ul></ul>
  11. 11. THANK YOU dONE BY: ANGELA JACINTA YOKEHUEI GEOKMOOI JIAYING

×