RELATIONSHIP BETWEEN FARMING AND ECOLOGY Groupmates: cheung ho - - PowerPoint PPT Presentation

RELATIONSHIP BETWEEN FARMING AND ECOLOGY

Groupmates: cheung ho ming Lo ho mimg Lui lok yi mok hiu yan

HOW FARMING AFFECTS ECOLOGY POSITIVELY

Farming needs ploughing of soil，better air aeration，more oxygen，enables aerobic respiration

• f bacteria or organisms living in soil。

Organic farming means there is no chemical fertilizerrs，it provides nutrients to soil and therefore worms can be attracted，and more

• rganisms will be attracted by worms.

HOW FARMING AFFECTS ECOLOGY NRGATIVELY

The pursuit of yield，monoculture，same niche，lack of specific kind of nutrients，unhealthy crops. Use of chemical control methods，some is toxic to othere species，toxins will be more concentrated along the higher trophic levels. Use of chemical control methods，pest resistent，does more harm than good. Chemical fertilizers，raining，nutrients washed into river， eutrophication

HOW ECOLOGY AFFECTS FARMING POSITIVELY

Decomposers decomposes dead body，breaks them down into humus，provides nutrients for growth. Legunme such as peanuts provide nitrate，which is the basics minerals for plants growth. Predator eats pests，increases abundance and yield. Earthworms help the plouging of soil，....

HOW ECOLOGY AFFECTS FARMING NEGATIVELY

Pests eat crops esp monoculture,decrease in productivity. Physical factors：typhoon，drought，flooding， frost...ruins crops.

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