Response of Cynodon dactylon (L.) Pers. to ammonium and nitrate nutrition

 

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dc.contributor.advisor Stock, WD en_ZA
dc.contributor.author Mafa, Paseka en_ZA
dc.date.accessioned 2017-10-12T08:38:03Z
dc.date.available 2017-10-12T08:38:03Z
dc.date.issued 1999 en_ZA
dc.identifier.citation Mafa, P. 1999. Response of Cynodon dactylon (L.) Pers. to ammonium and nitrate nutrition. University of Cape Town. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/25621
dc.description.abstract 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. en_ZA
dc.language.iso eng en_ZA
dc.subject.other Botany en_ZA
dc.subject.other Ecophysiology en_ZA
dc.title Response of Cynodon dactylon (L.) Pers. to ammonium and nitrate nutrition en_ZA
dc.type Bachelor Thesis
dc.date.updated 2017-02-07T08:40:03Z
uct.type.publication Research en_ZA
uct.type.resource Thesis en_ZA
dc.publisher.institution University of Cape Town
dc.publisher.faculty Faculty of Science en_ZA
dc.publisher.department Department of Biological Sciences en_ZA
dc.type.qualificationlevel Honours
dc.type.qualificationname BSc (Hons) en_ZA
uct.type.filetype
uct.type.filetype Text
uct.type.filetype Image
dc.identifier.apacitation Mafa, P. (1999). <i>Response of Cynodon dactylon (L.) Pers. to ammonium and nitrate nutrition</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Biological Sciences. Retrieved from http://hdl.handle.net/11427/25621 en_ZA
dc.identifier.chicagocitation Mafa, Paseka. <i>"Response of Cynodon dactylon (L.) Pers. to ammonium and nitrate nutrition."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Biological Sciences, 1999. http://hdl.handle.net/11427/25621 en_ZA
dc.identifier.vancouvercitation Mafa P. Response of Cynodon dactylon (L.) Pers. to ammonium and nitrate nutrition. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Biological Sciences, 1999 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/25621 en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Mafa, Paseka AB - 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. DA - 1999 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1999 T1 - Response of Cynodon dactylon (L.) Pers. to ammonium and nitrate nutrition TI - Response of Cynodon dactylon (L.) Pers. to ammonium and nitrate nutrition UR - http://hdl.handle.net/11427/25621 ER - en_ZA


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