Abstract
To find out the optimum mixture ratio of ammonium and nitrate on rice plant, 4 rice varieties were examined during 14days after transplanting in hydroponics with the different ratio of ammonium to nitrate(100 : 0, 75 : 25, 50 : 50, 25 : 75 and 0 : 100). The highest N uptake from solution and the maximum plant dry weight were 60~70% ammonium and 30~40% nitrate mixture treatment both in Japonica and Tongil type rice plants. And with the same varieties N-uptake and N use-efficiency were compared between 10.0 mM and 1.0 mM nitrogen using 70% ammonium and 30% nitrate for 24 days after transplanting. Rice plants absorbed more nitrogen(131~145%) in 10.0 mM than 1.0 mM treatment but accumulated N in rice plants were almost the same in both treatment. Among the tested rice cultivars, dry matter production and total accumulative nitrogen in rice plants were much high in Tongil type than japonica type rice cultivars. N-recovery ratios of rice plants from uptake N were 90.8-99.0% in low concentration N solution(1.0 mM), but 69.4-81.7% were observed in high concentration N solution(10.0 mM). It means that suppling low concentration N steadily will be better to prevent loss of N without reducing of growth in rice plants.
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Claims 9
Claim · model-written summary
A 60–70% ammonium mixture yielded the highest nitrogen uptake.
- Taxon
- rice plants
Oryza sativae0 - Treatment
- 60~70% ammonium and 30~40% nitrate mixture treatmente0
- Outcome
- N uptake from solutione0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest N uptake from solution and the maximum plant dry weight were 60~70% ammonium and 30~40% nitrate mixture treatment both in Japonica and Tongil type rice plants.”
Claim · model-written summary
The same mixture gave maximum plant dry weight.
- Taxon
- rice plantsOryza sativae0
- Treatment
- 60~70% ammonium and 30~40% nitrate mixture treatmente0
- Outcome
- plant dry weighte0
- Direction
- maximume0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest N uptake from solution and the maximum plant dry weight were 60~70% ammonium and 30~40% nitrate mixture treatment both in Japonica and Tongil type rice plants.”
Claim · model-written summary
Rice absorbed 131~145% more nitrogen at 10.0 mM than 1.0 mM.
- Taxon
- Rice plantsOryza sativae0
- Treatment
- 10.0 mMe0
- Outcome
- absorbed more nitrogene0
- Direction
- moree0
- Value
- 131~145%e0
- Comparator
- 1.0 mM treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice plants absorbed more nitrogen(131~145%) in 10.0 mM than 1.0 mM treatment”
Claim · model-written summary
Accumulated nitrogen was nearly the same at both nitrogen concentrations.
- Taxon
- rice plantsOryza sativae0
- Treatment
- both treatmente0
- Outcome
- accumulated Ne0
- Direction
- almost the samee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“accumulated N in rice plants were almost the same in both treatment”
Claim · model-written summary
Tongil cultivars produced more dry matter than japonica cultivars.
- Taxon
- rice plantsOryza sativae0
- Material
- Tongil typee0
- Outcome
- dry matter productione0
- Direction
- much highe0
- Comparator
- japonica type rice cultivarse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“dry matter production and total accumulative nitrogen in rice plants were much high in Tongil type than japonica type rice cultivars”
Claim · model-written summary
Tongil cultivars accumulated more nitrogen than japonica cultivars.
- Taxon
- rice plantsOryza sativae0
- Material
- Tongil typee0
- Outcome
- total accumulative nitrogene0
- Direction
- much highe0
- Comparator
- japonica type rice cultivarse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“dry matter production and total accumulative nitrogen in rice plants were much high in Tongil type than japonica type rice cultivars”
Claim · model-written summary
Nitrogen recovery was 90.8-99.0% in low concentration solution.
- Taxon
- rice plantsOryza sativae0
- Treatment
- low concentration N solution(1.0 mM)e0
- Outcome
- N-recovery ratiose0
- Value
- 90.8-99.0%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N-recovery ratios of rice plants from uptake N were 90.8-99.0% in low concentration N solution(1.0 mM)”
Claim · model-written summary
Nitrogen recovery was 69.4-81.7% in high concentration solution.
- Taxon
- rice plantsOryza sativae1
- Treatment
- high concentration N solution(10.0 mM)e0
- Outcome
- N-recovery ratiose1
- Value
- 69.4-81.7%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“69.4-81.7% were observed in high concentration N solution(10.0 mM)”
e1“N-recovery ratios of rice plants from uptake N were 90.8-99.0% in low concentration N solution(1.0 mM), but 69.4-81.7% were observed in high concentration N solution(10.0 mM)”
Claim · model-written summary
The authors recommend steady low-concentration nitrogen supply to prevent nitrogen loss without reducing growth.
- Taxon
- rice plantsOryza sativae0
- Outcome
- suppling low concentration N steadilye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“suppling low concentration N steadily will be better to prevent loss of N without reducing of growth in rice plants”
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See all 511 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.