Energy and food production
- Created by: emma
- Created on: 22-11-14 14:43
View mindmap
- Energy and Food production
- Fertilisers
- Inorganic
- Contain macro nutrients (N,P,K) and micro nutrients (Fe, Mg, S)
- Exact composition of ions for max growth
- Concentrated so applied in smaller amounts
- Easy and cean to apply
- Leaching problems
- Does not improve soil structure
- Costly to produce
- Organic
- Ions released slowly giving steady supply over long period
- Natural waste materials e.g. manure
- Bulky and must apply in large amounts
- Difficult to spread
- Ions released slowly so less leaching
- Improve soil structure
- Cheap
- Nitrogen for amino acids, DNA.
- Phosphorous for ATP, DNA,RNA, phospholipid bilayer
- Potassium for k pumps, protein synthesis, enzyme activator
- Iron and magnesium for chlorophyll production
- Sulphur for protein production
- Inorganic
- Environmental impact of fertilisers
- Leaching
- Eutrophication
- Algal bloom
- Algae block light
- Plants underwater can't photosynthesis so die
- Algae dies
- Increase in decomposes that respire aerobically
- Deplete O in water so other organism cannot respire and die
- Increase in decomposes that respire aerobically
- Algae dies
- Plants underwater can't photosynthesis so die
- Algae block light
- Algal bloom
- Reduce biodiversity
- Pesticides
- Contact- applied directly to plant and absorbed via stoma or o insects via spiracles
- Some may avoid contact
- Systematic- taken in by leaves transported around plant, insect eats plant and pesticide transported around insect
- Kills all parts
- Residual- Sprayed on soil and kills weed seedlings or insect eggs
- Should be cost effective, biodegradable, specific, should not accumulate
- Contact- applied directly to plant and absorbed via stoma or o insects via spiracles
- Biological control
- Use a natural predator of pest called a control agent
- Reduces pest to below harmful levls
- No use of pesticide so it can't enter food chain, less environmental damage, pests don't develop resistance, predator not killed by pesticide
- Control agent may become pest, may disperse, may have to keep reintroducuing
- Intensive rearing of domestic liveestock
- Restricted movement- less respiratory loss due to muscle movement
- Keeping animals indoor- control temp so less heat loss
- Fed optimum nutrition so more nutrients absorbed
- Predators excluded
- Selective breeding- the most efficient at converting energy to biomass
- Slaughtered when growing
- Pests
- Organisms that decrease the yield of a crop directly or indirectly
- Direct- eating part of crop humans use
- Indirectly- Eating leaves so less surface area for photosynthesis
- Weeds
- Compete for light nutrients space, interspecific competition
- Insects
- Feed on leaves and reduce surface area for photosynthesis
- Eat part used by humans
- Feed on leaves and reduce surface area for photosynthesis
- Fungi
- Spread diseases
- Organisms that decrease the yield of a crop directly or indirectly
- Fertilisers
- Organic
- Ions released slowly giving steady supply over long period
- Natural waste materials e.g. manure
- Bulky and must apply in large amounts
- Difficult to spread
- Ions released slowly so less leaching
- Improve soil structure
- Cheap
Comments
No comments have yet been made