Full Text Available
Note: Clicking the button above will open the full text document at the original institutional repository in a new window.
Response of Cynodon dactylon (L.) Pers. to ammonium and nitrate nutrition
Plants that come early in succession predominantly prefer_ ammonium form of nitrogen than nitrate. The hypothesis that Cynodon dactylon (L.) Pers., a grass in the primary succession stage would respond well when supplied with ammonium than nitrate fertiliser was tested. Seedlings of Cynodon dactylon...
Saved in:
| Main Author: | |
|---|---|
| Other Authors: | |
| Format: | Thesis |
| Language: | English |
| Published: |
Department of Biological Sciences
2017
|
| Subjects: | |
| Tags: |
No Tags, Be the first to tag this record!
|
| _version_ | 1867613271834492928 |
|---|---|
| access_status_str | Open Access |
| author | Mafa, Paseka |
| author2 | Stock, WD |
| author_browse | Mafa, Paseka Stock, WD |
| author_facet | Stock, WD Mafa, Paseka |
| author_sort | Mafa, Paseka |
| collection | Thesis |
| description | Plants that come early in succession predominantly prefer_ ammonium form of nitrogen than nitrate. The hypothesis that Cynodon dactylon (L.) Pers., a grass in the primary succession stage would respond well when supplied with ammonium than nitrate fertiliser was tested. Seedlings of Cynodon dactylon were grown in culture solution and fertilised with either ammonium sulphate or potassium nitrate at ~ continuous concentrations of 200 ppm, 400 ppm and 600 ppm in the growth chamber. In support of my hypothesis, growth of Cynodon dactylon was greater from ammonium than nitrate nutrition in terms of aboveground and total plants yields at 200 ppm and 400 ppm and this was associated with efficient utilisation of this form of nitrogen by this species. Production from the nitrate treatments was restricted and showed no change with increase in external nitrogen supply. Decreased dry weights from the ammonium nutrition at 600 ppm were associated with toxicity of ammonium ions in plant tissues. High levels of nitrogen measured from the nitrate treatments were associated with the soluble nitrogen that was not assimilated for yield increase by this grass, Uptake of ammonium ion was shown to result· in high of uptake phosphorus. This study shows that Cynodon dactylon has the capacity for increased growth under ammonium nutrition while this was limited in the nitrate nutrition. However, response is restricted when excessively fertilised with ammonium nitrogen. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/25621 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:33:28.738Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2017 |
| publishDateRange | 2017 |
| publishDateSort | 2017 |
| publisher | Department of Biological Sciences |
| publisherStr | Department of Biological Sciences |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/25621 Response of Cynodon dactylon (L.) Pers. to ammonium and nitrate nutrition Mafa, Paseka Stock, WD Botany Ecophysiology Plants that come early in succession predominantly prefer_ ammonium form of nitrogen than nitrate. The hypothesis that Cynodon dactylon (L.) Pers., a grass in the primary succession stage would respond well when supplied with ammonium than nitrate fertiliser was tested. Seedlings of Cynodon dactylon were grown in culture solution and fertilised with either ammonium sulphate or potassium nitrate at ~ continuous concentrations of 200 ppm, 400 ppm and 600 ppm in the growth chamber. In support of my hypothesis, growth of Cynodon dactylon was greater from ammonium than nitrate nutrition in terms of aboveground and total plants yields at 200 ppm and 400 ppm and this was associated with efficient utilisation of this form of nitrogen by this species. Production from the nitrate treatments was restricted and showed no change with increase in external nitrogen supply. Decreased dry weights from the ammonium nutrition at 600 ppm were associated with toxicity of ammonium ions in plant tissues. High levels of nitrogen measured from the nitrate treatments were associated with the soluble nitrogen that was not assimilated for yield increase by this grass, Uptake of ammonium ion was shown to result· in high of uptake phosphorus. This study shows that Cynodon dactylon has the capacity for increased growth under ammonium nutrition while this was limited in the nitrate nutrition. However, response is restricted when excessively fertilised with ammonium nitrogen. 2017-10-12T08:38:03Z 2017-10-12T08:38:03Z 1999 2017-02-07T08:40:03Z Bachelor Thesis Honours BSc (Hons) http://hdl.handle.net/11427/25621 eng application/pdf Department of Biological Sciences Faculty of Science University of Cape Town |
| spellingShingle | Botany Ecophysiology Mafa, Paseka Response of Cynodon dactylon (L.) Pers. to ammonium and nitrate nutrition |
| thesis_degree_str | Bachelor's / Honours |
| title | Response of Cynodon dactylon (L.) Pers. to ammonium and nitrate nutrition |
| title_full | Response of Cynodon dactylon (L.) Pers. to ammonium and nitrate nutrition |
| title_fullStr | Response of Cynodon dactylon (L.) Pers. to ammonium and nitrate nutrition |
| title_full_unstemmed | Response of Cynodon dactylon (L.) Pers. to ammonium and nitrate nutrition |
| title_short | Response of Cynodon dactylon (L.) Pers. to ammonium and nitrate nutrition |
| title_sort | response of cynodon dactylon l pers to ammonium and nitrate nutrition |
| topic | Botany Ecophysiology |
| url | http://hdl.handle.net/11427/25621 |
| work_keys_str_mv | AT mafapaseka responseofcynodondactylonlperstoammoniumandnitratenutrition |