Abstract
극만기 벼 재배시 적응 품종을 선택할 때 7월 30일 전후의 이앙시기에서 불시출수 현상을 보이지 않으면서 적당한 출엽수를 확보하는 품종 특성을 구비해야 하는데 금오벼1호나 만종벼는 후기작 이앙시기에서도 출엽수 감소가 적고 규칙적인 출엽 양상을 보여 극만기 벼 재배시기에 안정적인 재배가 가능하였다. 관행 벼육묘상자 육묘에 비해 포트육묘로 벼의 생육단계를 진전시켜 이앙하면 후기작에서 출수기까지 1~3일의 생육기간이 단축되었다. 벼 폿트육묘상자를 이용했을 때와 좀더 공간이 큰 폿트육묘 상자를 이용하여 초기 벼 생육을 높여도 출수기 단축효과는 2일 이내로 크지 않았다. 따라서 벼 육묘상자와 폿트육묘의 출수기 단축효과는 초기 생육단계의 차이보다 이앙후 뿌리가 잘리지 않아 생기는 빠른 활착효과 때문으로 추정된다. $800^{\circ}C$ 이상의 등숙온도가 확보되는 출수시기는 익산은 9월 12일이었다. 폿트육묘를 할 경우 출수기가 1~3일 빨라지기 때문에 출수 후 50일간 평균온도가 조금 높아지는 결과를 얻었는데, 7월 26일 이앙에서는 $20^{\circ}C$에 근접한 온도가 유지되었고, 7월 31일에는 $19^{\circ}C$전후, 8월 5일에는 $17.5{\sim}18.0^{\circ}C$로 5일간 이앙시기가 지연됨에 따라서 등숙기 평균온도는 $1^{\circ}C$ 정도씩 저하되었다. 극만기 벼 재배에서 폿트육묘후 이앙한 경우 수량이 증대하였다. 폿트육묘하여 이앙하는 경우는 각 주별 식물체가 1~3개로 육묘상자로 육묘한 경우보다 적어 짧은 생육기간에 적정 수수를 확보하기 어려웠다. 따라서 폿트육묘로 후기작 재배시에는 재식밀도를 높여야 수량 증대 효과를 크게 얻을 수 있을 것으로 생각된다. This study was carried out to evaluate the productivity of rice cultivation in extremely late season in Korea and to confirm the effects of pot-raising seedling culture in this case by assessing the growth and yield performance of rice cultivars that are well adapted to late culture. Suitable cultivars for extremely late culture should not have premature heading habit when transplanted around late July and also secure appropriate growth duration before heading. Geumobyeo 1 and Manjongbyeo showed small decrease in the emerged leaves in transplanting in late July or early August and heading occurred at the same time relatively without premature heading. At transplanting from late July to early August in extremely late rice cultivation, ripening was relatively good until transplanting on August 5. At transplanting on July 30, accumulated temperature from heading to the first frost was $853^{\circ}C$ and ripening was good enough. However, heading was delayed by low temperature at transplanting on August 10 and ripening was very poor due to low accumulated temperature of below $800^{\circ}C$, causing drastic decrease of rice yield. The rice yield increased in transplanting with pot seedling, especially the effects of pot seedling was higher in Geumobyeo 1, but panicle number was not enough to secure rice yield owing to short growth duration. In order to cultivate rice in extremely late season, we should select adaptive rice cultivars that have suitable growth duration and excellent ripening in low temperature. Here, pot-seedling did a great role to secure early growth and bigger growth amounts.
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Claims 11
Claim · model-written summary
Geumobyeo 1 showed little decline in emerged leaves and no premature heading under late transplanting.
- Taxon
- Rice
Oryza sativat0 - Material
- Geumobyeo 1e0
- Outcome
- emerged leavese0
- Direction
- small decreasee0
- Qualifier
- late July or early Auguste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Geumobyeo 1 and Manjongbyeo showed small decrease in the emerged leaves in transplanting in late July or early August and heading occurred at the same time relatively without premature heading.”
t0“Rice”
Claim · model-written summary
Manjongbyeo showed little decline in emerged leaves and no premature heading under late transplanting.
- Taxon
- riceOryza sativat0
- Material
- Manjongbyeoe0
- Outcome
- emerged leavese0
- Direction
- small decreasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Geumobyeo 1 and Manjongbyeo showed small decrease in the emerged leaves in transplanting in late July or early August and heading occurred at the same time relatively without premature heading.”
t0“rice”
Claim · model-written summary
Rice ripening remained relatively good for transplanting through August 5.
- Taxon
- RiceOryza sativat0
- Outcome
- ripeninge0
- Direction
- relatively goode0
- Qualifier
- August 5e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ripening was relatively good until transplanting on August 5”
t0“Rice”
Claim · model-written summary
July 30 transplanting yielded 853 degrees C accumulated temperature before first frost and adequate ripening.
- Taxon
- RiceOryza sativat0
- Outcome
- accumulated temperaturee0
- Value
- $853^{\circ}C$e0
- Qualifier
- July 30e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At transplanting on July 30, accumulated temperature from heading to the first frost was $853^{\circ}C$ and ripening was good enough.”
t0“Rice”
Claim · model-written summary
August 10 transplanting delayed rice heading under low temperature.
- Taxon
- RiceOryza sativat0
- Treatment
- transplanting on August 10e0
- Outcome
- headinge0
- Direction
- delayede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“heading was delayed by low temperature at transplanting on August 10”
t0“Rice”
Claim · model-written summary
August 10 transplanting produced very poor ripening under accumulated temperature below 800 degrees C.
- Taxon
- RiceOryza sativat0
- Treatment
- transplanting on August 10e1
- Outcome
- ripeninge0
- Direction
- very poore0
- Qualifier
- below $800^{\circ}C$e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ripening was very poor due to low accumulated temperature of below $800^{\circ}C$”
e1“transplanting on August 10”
t0“Rice”
Claim · model-written summary
August 10 transplanting caused a drastic decrease in rice yield.
- Taxon
- RiceOryza sativat0
- Treatment
- transplanting on August 10e1
- Outcome
- rice yielde0
- Direction
- drastic decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“causing drastic decrease of rice yield”
e1“transplanting on August 10”
t0“Rice”
Claim · model-written summary
Transplanting pot-raised seedlings increased rice yield.
- Taxon
- RiceOryza sativat0
- Treatment
- pot seedlinge0
- Outcome
- rice yielde0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The rice yield increased in transplanting with pot seedling”
t0“Rice”
Claim · model-written summary
The pot-seedling yield effect was greater for Geumobyeo 1.
- Taxon
- RiceOryza sativat0
- Material
- Geumobyeo 1e0
- Outcome
- effects of pot seedlinge0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the effects of pot seedling was higher in Geumobyeo 1”
t0“Rice”
Claim · model-written summary
Short growth duration left insufficient panicles to secure rice yield.
- Taxon
- RiceOryza sativat0
- Outcome
- panicle numbere0
- Direction
- not enoughe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“panicle number was not enough to secure rice yield owing to short growth duration”
t0“Rice”
Claim · model-written summary
The authors recommend late-season rice cultivars with suitable growth duration and good low-temperature ripening.
- Taxon
- RiceOryza sativat0
- Outcome
- select adaptive rice cultivarse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“we should select adaptive rice cultivars that have suitable growth duration and excellent ripening in low temperature”
t0“Rice”
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