Abstract
The experimental materials used here were 12 rice cultivars released and grown in the past one century in the southern area of Japan and two African cultivars. With plants water-cultured under standard and low nitrogen applications, their dry matter weight, Ieaf area and net assimilation rate (NAR), rubisco content and chlorophyll content in leaves were investigated. Results obtained were as follows: By reducing the nitrogen concentration of culture-solution to 100/0 of the standard, the average plant dry matter weight and leaf area of the 14 cultivars were decreased to 250/0 and 200/0, respectively. To evaluate the growih sustainability of cultivars grbwn under the low nitrogen application, the sustainability index (SIL) wa tised here. SIL of dry matter weight (SIltDM), Ieaf area (SIl;LA) and NAR (SIL-NAR) were signifidantly differ-* ent among cultivars. For these three parameters, Iarge values were found in Koshihikari, one of the high quality cultivars widely grown in Japan today, and the small ones were observed in old, traditional cultivars, such as Asahi and Shinriki, and in G174 (O, glabe ima). A significant cultivaral difference in response to nitrogen application was also found in the rubisco and chlorophyll contents and their SILs.
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Claims 5
Claim · model-written summary
Reduced nitrogen lowered average dry matter weight to 250/0 of standard.
- Taxon
- Rice Species
Oryza sativat0 - Treatment
- reducing the nitrogen concentration of culture-solution to 100/0 of the standarde0
- Outcome
- plant dry matter weighte0
- Direction
- decreasede0
- Value
- 250/0e0
- Comparator
- the standarde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice Species”
e0“By reducing the nitrogen concentration of culture-solution to 100/0 of the standard, the average plant dry matter weight and leaf area of the 14 cultivars were decreased to 250/0 and 200/0, respectively”
Claim · model-written summary
Reduced nitrogen lowered average leaf area to 200/0 of standard.
- Taxon
- Rice SpeciesOryza sativat0
- Treatment
- reducing the nitrogen concentration of culture-solution to 100/0 of the standarde0
- Outcome
- leaf areae0
- Direction
- decreasede0
- Value
- 200/0e0
- Comparator
- the standarde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice Species”
e0“By reducing the nitrogen concentration of culture-solution to 100/0 of the standard, the average plant dry matter weight and leaf area of the 14 cultivars were decreased to 250/0 and 200/0, respectively”
Claim · model-written summary
Sustainability indices of dry matter, leaf area and NAR differed among cultivars.
- Taxon
- Rice SpeciesOryza sativat0
- Outcome
- SIL of dry matter weight (SIltDM), Ieaf area (SIl;LA) and NAR (SIL-NAR)e0
- Direction
- differ-* ente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice Species”
e0“SIL of dry matter weight (SIltDM), Ieaf area (SIl;LA) and NAR (SIL-NAR) were signifidantly differ-* ent among cultivars”
Claim · model-written summary
Koshihikari had high sustainability values, whereas Asahi, Shinriki and G174 had low values.
- Taxon
- Rice SpeciesOryza sativat0
- Material
- Koshihikarie0
- Outcome
- Iarge valuese0
- Comparator
- Asahi and Shinriki, and in G174 (O, glabe ima)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice Species”
e0“Iarge values were found in Koshihikari, one of the high quality cultivars widely grown in Japan today, and the small ones were observed in old, traditional cultivars, such as Asahi and Shinriki, and in G174 (O, glabe ima)”
Claim · model-written summary
Rubisco and chlorophyll content responses to nitrogen differed among cultivars.
- Taxon
- Rice SpeciesOryza sativat0
- Treatment
- nitrogen applicatione0
- Outcome
- rubisco and chlorophyll contents and their SILse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice Species”
e0“A significant cultivaral difference in response to nitrogen application was also found in the rubisco and chlorophyll contents and their SILs”
The same questions in other papers
nitrogen · growth · Oryza sativa (rice)Positive and negative results
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