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The use of green manure to improve the sustainability of the rice production in Asia - can the green manure replace the N-fertilizers?
2002 (English)Independent thesis Basic level (degree of Bachelor)Student thesis
Abstract [en]

The use of artificial fertilizers has increased from 1960´s because of new external factors like the importance of international market whom rules are ordered by developed countries and an increasing population. Although farmers in developing countries like in Asia appreciate this inorganic input for its fast effect and its ease, its efficiency has been lower than expected and its intensive use has involved some new environmental problems. Scientists as well as the farmers have realized that the inorganic fertilizers are not a sustainable source of nutrients. In the hope of meeting environmental and economical goals, new sustainable agricultural systems are developed. The green manuring, that consists to incorporate some green plants into the soil to supply some nutrients for the next crop, is one of the possibilities. A sustainable agriculture includes the environmental aspects as well as economical and social factors. That’s why the farmers´perspectives were considered. Whereas green manure is a great environmental solution, farmers are reluctant to this kind of agriculture because of some loss of revenue. I therefore based my thesis on a comparison between the green manure and artificial fertilizers with their different grain yields, which are linked to the farmers´revenue. The green manure is, according to the chosen specie and its great management, a good replace for the inorganic fertilizer as similar grain yields can be harvested. The grain yields are, for instance, 3,96 t/ha and 4,42 t/ha for a treatment with Sesbania sesban and N-fertilizer, respectively. But, in a context of growing global population and hence a need to maximize the grain yield, green manure is not efficient enough. But several alternatives can be combined with the green manuring like other biofertilizer (rice straw, dung manure) but also a calculated dose of inorganic fertilizer. The conclusion of this survey shows that chemical fertilizers are not indispensable and can be replace by more sustainable alternatives. But more studies have to be made in a long term to see the efficiency of the different biofertilizers and of their combination. It is really important that farmers´point of view is taken in account as their participation is necessary for the great application of this sustainable agricultural system.

Place, publisher, year, edition, pages
2002. , 23 p.
Identifiers
URN: urn:nbn:se:kau:diva-54446Local ID: MIV C-2OAI: oai:DiVA.org:kau-54446DiVA: diva2:1103174
Subject / course
Environmental Science
Available from: 2017-05-30 Created: 2017-05-30

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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
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