1 / 15

Lecture 4.1 Cycles of plant nutrients and water

Lecture 4.1 Cycles of plant nutrients and water . How do plant nutrients and water flow in nature? How has these flows been changed by society? Goal: To be familiar with the natural cycles of plant nutrients and water and to know how different sanitation systems affect these cycles.

simeon
Télécharger la présentation

Lecture 4.1 Cycles of plant nutrients and water

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Lecture 4.1 Cycles of plant nutrients and water How do plant nutrients and water flow in nature? How has these flows been changed by society? Goal: To be familiar with the natural cycles of plant nutrients and water and to know how different sanitation systems affect these cycles.

  2. Carbohydrates, proteins, fats, etc N, P, K, S, etc

  3. Accumulation of nutrients

  4. Hydrological cycle Evaporation from open water www.fao.org/docrep/U8480E/U8480E3k.jpg

  5. Linear flow of plant nutrients in present food chain

  6. Fertiliser use • 40% of global food is produced with mineral fertiliser • Mainly NPK • N= 95 MT* • P= 8,5 MT* • Mineral fertiliser production • 1.2% of energy consumption • 1.2% of GHG emission • Lack micro-nutrient and humus *FAO 2006

  7. The nutrient content • Urine and faeces • Average earthling (Indian) • 2400cal/pers, day • Annual global nutrient consumption • N=20 MT 21% • P=2 MT 24% • The cost of nutrients 1 kg N • Farmer 0.7€ • STP 7€

  8. Quality of ground water in Kampala • Main water source – protected springs • Main toilet system – dug pit latrin • Most springs faecal contaminated

  9. By closing the loop - both leakage and input are minimised

  10. Crop nutrient removal

  11. Total protein and nitrogen supply in grams per person and day (FAO, 2001) in different regions and countries Protein (blue bar) Nitrogen (red bar)

  12. Excreta N from vegetal and animal sources (FAO, 1999), g/pers, day Vegetal protein Animal Protein

  13. Human & animal N, g/pers, day

  14. Contributions of human excreta & animal manure in % to their summed N flow

  15. Potential recycled excreta N & P as % of used commercial fertilizers Potential recycled N & P, % of commercial N & P Rockström et al., 2006

More Related