Abstract
The influence of an additional supply of ammonium to a nitrate containing hydroponic solution on the mineral nutrition of greenhouse rose plants ( Rosa hybrida cv. ‘Lambada’) has been investigated. The effect on NPK uptake, mineral contents in roots and leaves as well as nitrate reductase (NR) and glutamine synthetase (GS) activities were examined. The addition of ammonium in a nutrient solution containing nitrate produced a total nitrogen uptake increase during shoot elongation, while in the absence of ammonium, nitrate uptake was lower during shoot elongation. Adding ammonium to the hydroponics solution caused an increase of potassium uptake while ammonium absorption was constant. Phosphate uptake was always higher in combined nitrate plus ammonium treatment, likewise in this treatment the most relevant effect on plant mineral content was the increase of P concentration in the roots. In both treatments with or without NH + 4 , free nitrate was notably higher in the roots than in leaves, indicating that nitrate reduction in rose plants takes place mainly in the leaves. NR activity in the leaves was higher when ammonium was present, whereas the root GS activity was similar in both treatments. The influence of ammonium on phosphate uptake and the subsequent effects on transport of other ions and enzymatic activities are discussed.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 10
Claim · model-written summary
Ammonium increased total nitrogen uptake during shoot elongation.
Not reportedComparator
Verbatim
e0“The addition of ammonium in a nutrient solution containing nitrate produced a total nitrogen uptake increase during shoot elongation”
t0“rose plants”
Claim · model-written summary
Without ammonium, nitrate uptake was lower during shoot elongation.
Not reportedComparator
Verbatim
e0“while in the absence of ammonium, nitrate uptake was lower during shoot elongation.”
t0“rose plants”
Claim · model-written summary
Adding ammonium increased potassium uptake.
Not reportedComparator
Verbatim
e0“Adding ammonium to the hydroponics solution caused an increase of potassium uptake while ammonium absorption was constant.”
t0“rose plants”
Claim · model-written summary
Ammonium absorption stayed constant.
Verbatim
e0“ammonium absorption was constant.”
t0“rose plants”
Claim · model-written summary
Phosphate uptake was higher with combined nitrate and ammonium.
Not reportedComparator
Verbatim
e0“Phosphate uptake was always higher in combined nitrate plus ammonium treatment”
t0“rose plants”
Claim · model-written summary
Combined nitrate and ammonium increased root P concentration.
Not reportedComparator
Verbatim
e0“in this treatment the most relevant effect on plant mineral content was the increase of P concentration in the roots.”
t0“rose plants”
Claim · model-written summary
Free nitrate was higher in roots than leaves in both treatments.
Verbatim
e0“In both treatments with or without NH + 4 , free nitrate was notably higher in the roots than in leaves”
t0“rose plants”
Claim · model-written summary
Nitrate reduction in roses takes place mainly in leaves.
Verbatim
e0“indicating that nitrate reduction in rose plants takes place mainly in the leaves.”
t0“rose plants”
Claim · model-written summary
Leaf nitrate reductase activity was higher with ammonium.
Not reportedComparator
Verbatim
e0“NR activity in the leaves was higher when ammonium was present”
t0“rose plants”
Claim · model-written summary
Root glutamine synthetase activity was similar with and without ammonium.
Not reportedComparator
Verbatim
e0“whereas the root GS activity was similar in both treatments.”
t0“rose plants”
The same questions in other papers
nitrogen · physiology: enzyme activity · RosaResults agree
1 paper in the same direction as this paper
- positive
nitrogen · nutrient: content · RosaResults agree
4 papers in the same direction as this paper
- positive
- positive
- positive
1 paper more in this group
See all 5 papers →fertilization · nutrient: content · RosaResults agree
6 papers in the same direction as this paper
- positive
- positive
- positive
3 papers more in this group
See all 7 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.