Abstract
By using the method of nutrient solution culture and simulated low phosphorus availability stress(by adding calcium phosphate),differences in response of maize to different nitrogen forms(NO-3 and NH+4) at levels of 0,3,7.5,15,22.5,30 and 37.5 mmol/L were analyzed.The result showed that nitrogen nutrition,supplied with either ammonium or nitrate,at levels of lower than 22.5 mmol/L,enhanced low availability of phosphorus stress tolerance of maize plants.Relationship between total biomass,dry weight of shoots and roots,plant height,leaf area and roots volume,and nitrogen supply typically follow a relationship similar to the law of diminishing yield increment.The highest dry weight of maize was observed when nitrogen nutrition was supplied at level 0-7.5 mmol/L.Plant height and roots volume of nitrate-fed maize plants were higher than that of ammonium-fed maize plant supplied with equal nitrogen level.However,response of biomass to nitrogen form differs in maize cultivars.Total biomass,shoots and roots biomass of maize cultivars Limin 15 supplied with nitrate were higher than that of ammonium,while it is different for maize cultivars.On the view of phosphorus nutrition characters,phosphorus content of ammonium-fed maize cultivars Lmin 15 was higher than that of nitrate-fed,when nitrogen was supplied at levels higher than 3 mmol/L.However,phosphorus content of ammonium-fed maize cultivars Wanyu 9 was lower than that of nitrate-fed,when nitrogen was supplied at levels higher than 30 mmol/L.Phosphorus content of maize cultivars Wanyu 9 was significantly negative correlated with that of biomass dry weight(r=-0.77* *,n=11),while positive correlationship for maize cultivars Wanyu 9(r= 0.96* *,n=11).Furthermore,there is no significant difference in leaf area,photosynthesis rate and roots activity of maize plants supplied with the two nitrogen forms at total plant level.Therefore,acclimation mechanism of maize plant to low availability phosphorus stress might be different between nitrogen form treatments.Tolerance of maize plants to the stress was due to optimal nitrogen level rather than nitrogen form.
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Claims 16
Claim · model-written summary
Ammonium or nitrate below 22.5 mmol/L enhanced maize tolerance of low phosphorus availability.
- Treatment
- either ammonium or nitrate,at levels of lower than 22.5 mmol/Le0
- Outcome
- low availability of phosphorus stress tolerancee0
- Direction
- enhancede0
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nitrogen nutrition,supplied with either ammonium or nitrate,at levels of lower than 22.5 mmol/L,enhanced low availability of phosphorus stress tolerance of maize plants”
Claim · model-written summary
Total biomass followed a diminishing-increment relation with nitrogen supply.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Relationship between total biomass,dry weight of shoots and roots,plant height,leaf area and roots volume,and nitrogen supply typically follow a relationship similar to the law of diminishing yield increment”
e1“response of maize to different nitrogen forms”
Claim · model-written summary
Shoot and root dry weight followed a diminishing-increment relation with nitrogen supply.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Relationship between total biomass,dry weight of shoots and roots,plant height,leaf area and roots volume,and nitrogen supply typically follow a relationship similar to the law of diminishing yield increment”
e1“response of maize to different nitrogen forms”
Claim · model-written summary
Plant height, leaf area and root volume followed a diminishing-increment relation with nitrogen supply.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Relationship between total biomass,dry weight of shoots and roots,plant height,leaf area and roots volume,and nitrogen supply typically follow a relationship similar to the law of diminishing yield increment”
e1“response of maize to different nitrogen forms”
Claim · model-written summary
Maize dry weight was highest at nitrogen supply of 0-7.5 mmol/L.
- Treatment
- nitrogen nutrition was supplied at level 0-7.5 mmol/Le0
- Outcome
- dry weighte0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest dry weight of maize was observed when nitrogen nutrition was supplied at level 0-7.5 mmol/L”
Claim · model-written summary
Nitrate-fed maize had greater plant height than ammonium-fed maize at equal nitrogen supply.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plant height and roots volume of nitrate-fed maize plants were higher than that of ammonium-fed maize plant supplied with equal nitrogen level”
Claim · model-written summary
Nitrate-fed maize had greater root volume than ammonium-fed maize at equal nitrogen supply.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plant height and roots volume of nitrate-fed maize plants were higher than that of ammonium-fed maize plant supplied with equal nitrogen level”
Claim · model-written summary
Limin 15 had higher total, shoot and root biomass under nitrate than ammonium.
- Material
- Limin 15e0
- Treatment
- nitratee0
- Outcome
- Total biomass,shoots and roots biomasse0
- Direction
- highere0
- Comparator
- ammoniume0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total biomass,shoots and roots biomass of maize cultivars Limin 15 supplied with nitrate were higher than that of ammonium”
Claim · model-written summary
For Lmin 15 above 3 mmol/L nitrogen, ammonium-fed plants had higher phosphorus content than nitrate-fed plants.
- Material
- Lmin 15e0
- Treatment
- ammonium-fede0
- Outcome
- phosphorus contente0
- Direction
- highere0
- Qualifier
- levels higher than 3 mmol/Le0
- Comparator
- nitrate-fede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“phosphorus content of ammonium-fed maize cultivars Lmin 15 was higher than that of nitrate-fed,when nitrogen was supplied at levels higher than 3 mmol/L”
Claim · model-written summary
For Wanyu 9 above 30 mmol/L nitrogen, ammonium-fed plants had lower phosphorus content than nitrate-fed plants.
- Material
- Wanyu 9e0
- Treatment
- ammonium-fede0
- Outcome
- phosphorus contente0
- Direction
- lowere0
- Qualifier
- levels higher than 30 mmol/Le0
- Comparator
- nitrate-fede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“phosphorus content of ammonium-fed maize cultivars Wanyu 9 was lower than that of nitrate-fed,when nitrogen was supplied at levels higher than 30 mmol/L”
Claim · model-written summary
In Wanyu 9, phosphorus content was negatively correlated with biomass dry weight (r=-0.77).
- Material
- Wanyu 9e0
- Outcome
- Phosphorus contente0
- Direction
- negative correlatede0
- Value
- r=-0.77* *e0
- Comparator
- biomass dry weighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phosphorus content of maize cultivars Wanyu 9 was significantly negative correlated with that of biomass dry weight(r=-0.77* *,n=11)”
Claim · model-written summary
The abstract also reports a positive phosphorus-content correlation for Wanyu 9 (r=0.96), without clearly identifying its paired variable.
- Material
- Wanyu 9e0
- Outcome
- positive correlationshipe0
- Direction
- positive correlationshipe0
- Value
- r= 0.96* *e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“positive correlationship for maize cultivars Wanyu 9(r= 0.96* *,n=11)”
Claim · model-written summary
Leaf area did not significantly differ between maize plants receiving the two nitrogen forms.
- Treatment
- two nitrogen formse0
- Outcome
- leaf areae0
- Direction
- no significant differencee0
- Comparator
- two nitrogen formse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there is no significant difference in leaf area,photosynthesis rate and roots activity of maize plants supplied with the two nitrogen forms”
Claim · model-written summary
Photosynthesis rate did not significantly differ between maize plants receiving the two nitrogen forms.
- Treatment
- two nitrogen formse0
- Outcome
- photosynthesis ratee0
- Direction
- no significant differencee0
- Comparator
- two nitrogen formse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there is no significant difference in leaf area,photosynthesis rate and roots activity of maize plants supplied with the two nitrogen forms”
Claim · model-written summary
Root activity did not significantly differ between maize plants receiving the two nitrogen forms.
- Treatment
- two nitrogen formse0
- Outcome
- roots activitye0
- Direction
- no significant differencee0
- Comparator
- two nitrogen formse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there is no significant difference in leaf area,photosynthesis rate and roots activity of maize plants supplied with the two nitrogen forms”
Claim · model-written summary
The authors attributed low-phosphorus tolerance to optimal nitrogen level.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tolerance of maize plants to the stress was due to optimal nitrogen level rather than nitrogen form”
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