harvesting n.
Skip this Video
Loading SlideShow in 5 Seconds..
Harvesting PowerPoint Presentation


229 Vues Download Presentation
Télécharger la présentation


- - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

  1. Harvesting

  2. Ways to Harvest • Hunter/gathering • Slash and burn • Agribusiness • Inshore/offshore • Aquaculture • Local/global

  3. Hunter-Gatherer • Hunter-gatherers hunt game (animals) and collect plant foods (called foraging) rather than grow or tend crops. • Hunter-gatherers are traditionally identified by their tools: bow and arrow, atlatl, harpoon and projectile points.

  4. Slash and Burn • Consists of cutting and burning of forests or woodlands to create fields for agriculture or pasture for livestock, or for a variety of other purposes. • Typically used for shifting cultivation- where crops are used for a few years, then allowed to lie dormant for several years and then used again.

  5. Agribusiness • Farming that is also connected with the large-scale business operation embracing the production, processing, and distribution of agricultural products and the manufacture of farm machinery, equipment, and supplies.

  6. Inshore/offshore • Inshore fishing is where the water is normally more shallow. • fishing from a boat in easy sight of land and in water less than about 30 metres deep

  7. Offshore Fishing • fishing in deep water (more than 30 metres) and at some distance from land. It is dangerous compared to shallow water or lake fishing. More knowledge is needed about weather patterns, navigation and safety precautions, and this is not an activity for beginners.

  8. Aquaculture • The use of waters, other than the sea, for agricultural production, usually the production of fish.

  9. Old to New

  10. Technology • The Green Revolution

  11. Green Revolution refers to a series of research, development, and technology transfer initiatives, occurring between 1943 and the late 1970s, that increased industrialized agriculture production in many developing nations. wikipedia

  12. Green Revolution cont. • Scientists in the US, Mexico and the Philippines created new “super strains” of wheat and rice • They used heavy applications of water, fertilizer, and pesticides • This gave larger fields that matured faster

  13. Too good to be true? • Everything seemed good as many countries gained in exports, but if it seems too good to be true, it usually is! • Pesticides • Water • Biodiversity

  14. What about the Ocean?

  15. About 950 million people around the world rely on fish as their major source of protein. • About 200 million people are employed in the fish industry. • What controls where each type of fish are located?

  16. Continental Shelf • The continental shelf is an undersea extension of a continent which can stretch for many miles out to sea in some cases

  17. The shelf can be a few miles wide to over 200 miles (322 km), reaching a typical depth of 450 feet (137 m). • It collects most of the sand, silts and other sediments that rivers carry to the sea. • The relatively warm water and nutrients brought by the rivers make these areas a breeding ground for many marine life

  18. How do people fish? Fishing Activity Trawling