Abstract
MacDonald, W. N., Tsujita, M. J., Blom, T. J. and Shelp, B. J. 2014. Impact of various combinations of nitrate and chloride on nitrogen remobilization in potted chrysanthemum grown in a subirrigation system. Can. J. Plant Sci. 94: 643–657. Subirrigation is gaining popularity as an environmentally friendly strategy for managing the nutrition of potted chrysanthemum (Chrysanthemum morifolium Ramat.), as well as many other popular potted ornamental crops grown in the greenhouse. Subirrigation systems recycle the nutrient solution, but unlike the common practice of overhead irrigation, salts are more likely to accumulate in the top of the growing medium. Thus, further research is required to optimize the technology for the timing and application rates of soluble nitrogen in order to benefit from the high mobility of this nutrient within plants. This study tested the hypothesis that N use efficiency of subirrigated potted chrysanthemum can be improved by managing the nitrate status of the plant. Replacement of the nitrate supply with water 1 wk prior to inflorescence emergence (the midpoint of the experimental 10-wk crop cycle) was more effective in reducing the nitrate contents of above-ground tissues, particularly the stems and petioles, than the use of nitrate or various combinations of nitrate and chloride, thereby resulting in an improved N usage index (i.e., shoot dry mass×(shoot dry mass/shoot N content)). Shoot or inflorescence dry mass and N content were unaffected at the conclusion of the crop cycle by this treatment, whereas the electrical conductivity of the pot medium was reduced. Thus, elimination of nitrate prior to inflorescence emergence can be an effective strategy for improving N use efficiency in subirrigated potted chrysanthemums without sacrificing quality.
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Claims 5
Claim · model-written summary
Replacing nitrate with water reduced above-ground tissue nitrate more than nitrate or nitrate-chloride supplies.
Verbatim
e0“Replacement of the nitrate supply with water 1 wk prior to inflorescence emergence (the midpoint of the experimental 10-wk crop cycle) was more effective in reducing the nitrate contents of above-ground tissues, particularly the stems and petioles, than the use of nitrate or various combinations of nitrate and chloride”
t0“potted chrysanthemum”
Claim · model-written summary
Replacing nitrate with water improved the nitrogen usage index.
- Taxon
- potted chrysanthemumt0
- Treatment
- Replacement of the nitrate supply with watere1
- Outcome
- N usage indexe0
- Direction
- improvede0
Not reportedComparator
Verbatim
e0“thereby resulting in an improved N usage index (i.e., shoot dry mass×(shoot dry mass/shoot N content))”
t0“potted chrysanthemum”
e1“Replacement of the nitrate supply with water 1 wk prior to inflorescence emergence”
Claim · model-written summary
The nitrate replacement left shoot and inflorescence dry mass and nitrogen content unaffected at crop conclusion.
- Taxon
- potted chrysanthemumt0
- Treatment
- Replacement of the nitrate supply with watere1
- Outcome
- Shoot or inflorescence dry mass and N contente0
- Direction
- unaffectede0
Not reportedComparator
Verbatim
e0“Shoot or inflorescence dry mass and N content were unaffected at the conclusion of the crop cycle by this treatment”
t0“potted chrysanthemum”
e1“Replacement of the nitrate supply with water 1 wk prior to inflorescence emergence”
Claim · model-written summary
The nitrate replacement reduced pot-medium electrical conductivity.
- Taxon
- potted chrysanthemumt0
- Treatment
- Replacement of the nitrate supply with watere1
- Outcome
- electrical conductivity of the pot mediume0
- Direction
- reducede0
Not reportedComparator
Verbatim
e0“the electrical conductivity of the pot medium was reduced”
t0“potted chrysanthemum”
e1“Replacement of the nitrate supply with water 1 wk prior to inflorescence emergence”
Claim · model-written summary
The authors propose eliminating nitrate before inflorescence emergence to improve nitrogen use efficiency without sacrificing quality.
Verbatim
e0“elimination of nitrate prior to inflorescence emergence can be an effective strategy for improving N use efficiency in subirrigated potted chrysanthemums without sacrificing quality”
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