Abstract
Two experiments were conducted to determine the effects of various NH4(+)-N/NO3(-)-N percentages on growth and mineral concentrations in potato (Solanum tuberosum L.) plants using a non-recirculating nutrient film system in a controlled environment. The first experiment included six NH4(+)-N/NO3(-)-N percentages at 0/100, 20/80, 40/60, 60/40, 80/20, and 100/0 with the same total N concentration of 4 mM. The second experiment included six NH4(+)-N/NO3(-)-N percentages at 0/100, 4/96, 8/92, 12/88, 16/84, and 20/80 again with the same total N of 4 mM. In each experiment, plants were harvested 35 days after transplanting when tubers had been initiated and started to enlarge. Dry weights of shoots, tubers, and whole plant at the harvest were increased significantly with all mixed nitrogen treatments as compared with single NH4+ or NO3- form. The enhanced growth with mixed nitrogen was greatest at 8% to 20% NH4(+)-N. Also, the concentrations and accumulation of total N in the shoots and roots were greater with mixed nitrogen than with separate NH4+ or NO3- nutrition. With NH4+ present in the solutions, the concentrations of P and Cl in the shoots were increased compared to NO3- alone, whereas the tissue concentrations of Ca and Mg were decreased. It was concluded that nitrogen fertilization provided with combined NH4+ and NO3- forms, even at small proportions of NH4+, can enhance nitrogen uptake and productivity in potato plants.
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Claims 12
Claim · model-written summary
Mixed nitrogen significantly increased shoot dry weight relative to either nitrogen form alone.
- Taxon
- potato
Solanum tuberosumt0 - Treatment
- all mixed nitrogen treatmentse0
- Outcome
- Dry weights of shootse0
- Direction
- increasede0
- Comparator
- single NH4+ or NO3- forme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dry weights of shoots, tubers, and whole plant at the harvest were increased significantly with all mixed nitrogen treatments as compared with single NH4+ or NO3- form.”
t0“potatoes”
Claim · model-written summary
Mixed nitrogen significantly increased tuber dry weight relative to either nitrogen form alone.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- all mixed nitrogen treatmentse0
- Outcome
- tuberse0
- Direction
- increasede0
- Comparator
- single NH4+ or NO3- forme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dry weights of shoots, tubers, and whole plant at the harvest were increased significantly with all mixed nitrogen treatments as compared with single NH4+ or NO3- form.”
t0“potatoes”
Claim · model-written summary
Mixed nitrogen significantly increased whole plant dry weight relative to either nitrogen form alone.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- all mixed nitrogen treatmentse0
- Outcome
- whole plante0
- Direction
- increasede0
- Comparator
- single NH4+ or NO3- forme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dry weights of shoots, tubers, and whole plant at the harvest were increased significantly with all mixed nitrogen treatments as compared with single NH4+ or NO3- form.”
t0“potatoes”
Claim · model-written summary
Growth enhancement under mixed nitrogen was greatest at 8% to 20% ammonium nitrogen.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- mixed nitrogene0
- Outcome
- growthe0
- Direction
- greateste0
- Value
- 8% to 20% NH4(+)-Ne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The enhanced growth with mixed nitrogen was greatest at 8% to 20% NH4(+)-N.”
t0“potatoes”
Claim · model-written summary
Mixed nitrogen increased shoot total nitrogen concentration relative to separate forms.
- Taxon
- potatoSolanum tuberosumt0
- Organ / stage
- shootse0
- Treatment
- mixed nitrogene0
- Outcome
- concentrations and accumulation of total N in the shoots and rootse0
- Direction
- greatere0
- Comparator
- separate NH4+ or NO3- nutritione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the concentrations and accumulation of total N in the shoots and roots were greater with mixed nitrogen than with separate NH4+ or NO3- nutrition.”
t0“potatoes”
Claim · model-written summary
Mixed nitrogen increased root total nitrogen concentration relative to separate forms.
- Taxon
- potatoSolanum tuberosumt0
- Organ / stage
- rootse0
- Treatment
- mixed nitrogene0
- Outcome
- concentrations and accumulation of total N in the shoots and rootse0
- Direction
- greatere0
- Comparator
- separate NH4+ or NO3- nutritione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the concentrations and accumulation of total N in the shoots and roots were greater with mixed nitrogen than with separate NH4+ or NO3- nutrition.”
t0“potatoes”
Claim · model-written summary
Mixed nitrogen increased total nitrogen accumulation in shoots relative to separate forms.
- Taxon
- potatoSolanum tuberosumt0
- Organ / stage
- shootse0
- Treatment
- mixed nitrogene0
- Outcome
- accumulation of total N in the shoots and rootse0
- Direction
- greatere0
- Comparator
- separate NH4+ or NO3- nutritione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the concentrations and accumulation of total N in the shoots and roots were greater with mixed nitrogen than with separate NH4+ or NO3- nutrition.”
t0“potatoes”
Claim · model-written summary
Mixed nitrogen increased total nitrogen accumulation in roots relative to separate forms.
- Taxon
- potatoSolanum tuberosumt0
- Organ / stage
- rootse0
- Treatment
- mixed nitrogene0
- Outcome
- accumulation of total N in the shoots and rootse0
- Direction
- greatere0
- Comparator
- separate NH4+ or NO3- nutritione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the concentrations and accumulation of total N in the shoots and roots were greater with mixed nitrogen than with separate NH4+ or NO3- nutrition.”
t0“potatoes”
Claim · model-written summary
Ammonium in solution increased shoot phosphorus concentration relative to nitrate alone.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- NH4+ present in the solutionse0
- Outcome
- concentrations of P and Cl in the shootse0
- Direction
- increasede0
- Comparator
- NO3- alonee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With NH4+ present in the solutions, the concentrations of P and Cl in the shoots were increased compared to NO3- alone, whereas the tissue concentrations of Ca and Mg were decreased.”
t0“potatoes”
Claim · model-written summary
Ammonium in solution decreased tissue calcium and magnesium concentrations.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- NH4+ present in the solutionse0
- Outcome
- tissue concentrations of Ca and Mge0
- Direction
- decreasede0
- Comparator
- NO3- alonee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With NH4+ present in the solutions, the concentrations of P and Cl in the shoots were increased compared to NO3- alone, whereas the tissue concentrations of Ca and Mg were decreased.”
t0“potatoes”
Claim · model-written summary
The authors conclude that combined ammonium and nitrate fertilization can enhance nitrogen uptake.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- combined NH4+ and NO3- formse0
- Outcome
- nitrogen uptakee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nitrogen fertilization provided with combined NH4+ and NO3- forms, even at small proportions of NH4+, can enhance nitrogen uptake and productivity in potato plants.”
Claim · model-written summary
The authors conclude that combined ammonium and nitrate fertilization can enhance potato productivity.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- combined NH4+ and NO3- formse0
- Outcome
- productivitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nitrogen fertilization provided with combined NH4+ and NO3- forms, even at small proportions of NH4+, can enhance nitrogen uptake and productivity in potato plants.”
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- no effect
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37 papers in the same direction as this paper · 13 in the opposite direction
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See all 51 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.