Abstract
Stevia (Stevia rebaudiana Bertoni) is a perennial plant producing some natural sweeteners. Stevia is considered as a new crop in some countries. This study was conducted to find the stevia response to nitrogen fertilizer supply. Different levels of nitrogen (0, 30, 60, 90, 120, and 150 kg/ha from urea source) were used in a greenhouse condition and then the stevia growth and metabolites were assessed under different availability of nitrogen. Results showed that the optimum growth of stevia was obtained by 60 kg/ha nitrogen and more nitrogen supply did not enhance the stevia growth. It was observed that the total steviol glycosides (SVglys) content of Stevia was significantly increased by nitrogen fertilizer application just up to 30 kg/ha, while it decreased by more rates of nitrogen fertilizer. Our result clearly showed that SVglys yield reached to maximum value by application of 60 kg/ha of nitrogen fertilizer. Since the variation of SVglys content and shoot growth of the stevia were compromised by 60 kg/ha nitrogen, it can be concluded that 60 kg/ha of nitrogen fertilizer could be considered as an optimum rate of nitrogen for stevia and could also be recommended for greenhouse conditions.
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Claims 6
Claim · model-written summary
Stevia growth was optimal at 60 kg/ha nitrogen.
SteviaNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the optimum growth of stevia was obtained by 60 kg/ha nitrogen”
Claim · model-written summary
More nitrogen did not enhance stevia growth beyond 60 kg/ha.
- Treatment
- more nitrogen supplye0
- Outcome
- stevia growthe0
- Direction
- did not enhancee0
- Comparator
- 60 kg/ha nitrogene0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“60 kg/ha nitrogen and more nitrogen supply did not enhance the stevia growth”
Claim · model-written summary
Nitrogen fertilizer up to 30 kg/ha significantly increased total steviol glycosides content.
- Treatment
- nitrogen fertilizer application just up to 30 kg/hae0
- Outcome
- total steviol glycosides (SVglys) contente0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“total steviol glycosides (SVglys) content of Stevia was significantly increased by nitrogen fertilizer application just up to 30 kg/ha”
Claim · model-written summary
Higher nitrogen rates decreased steviol glycosides content.
- Treatment
- more rates of nitrogen fertilizere0
- Outcome
- total steviol glycosides (SVglys) contente1
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“while it decreased by more rates of nitrogen fertilizer”
e1“total steviol glycosides (SVglys) content of Stevia”
Claim · model-written summary
Steviol glycosides yield reached its maximum at 60 kg/ha nitrogen.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SVglys yield reached to maximum value by application of 60 kg/ha of nitrogen fertilizer”
e1“total steviol glycosides (SVglys) content of Stevia”
Claim · model-written summary
The authors recommend 60 kg/ha nitrogen for greenhouse stevia.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“60 kg/ha of nitrogen fertilizer could be considered as an optimum rate of nitrogen for stevia and could also be recommended for greenhouse conditions”
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