Claim · model-written summary
Straw weight decreased more with seedling age in ordinary and late culture; grain yield likewise declined after a marginal seeding date, especially with late planting and older seedlings.
- Taxon
- rice plant
Oryza sativat0 - Outcome
- grain yielde1
- Direction
- decreasee1
Verbatim
t0“ecological variations of rice plant”
e0“in ordinary culture it gradually decreased and the degree was became greater in late culture”
e1“grain yield didn't vary in early culture but it started to decrease when seeded later than a certain date, as seeding was delayed. The variation was much greater in cases of late planting and prolongation of seedling age”
Title
Hyun-Ok Choi The Korean Journal of Crop Science 1965
Other claims from this paper (19)
- Association Delayed seeding delayed rice heading, especially in early varieties and with longer seedling stages.
- Association Days to heading shortened with later seeding, more in late varieties and less with longer seedling stages.
- Association Beyond a marginal seeding date, cold weather prolonged days to heading.
- Association The shortening rate of days to heading was closely correlated with average days to heading.
- Method / resource A linear regression from sowing-date variation could predict rice heading date within the stated linear range.
- Method / resource Ordinary-culture days to heading closely correlated with other culture schedules and could estimate heading date for sowing from late March to mid-June.
- Association Maturing date was delayed as heading date was delayed within the maturation limit.
- Association Later heading was associated with lower average air temperature during rice ripening.
- Association Ripening duration shortened by 1.55 days per unit temperature increase over 18 to 28.
- Observation Kwansan showed the largest ripening-period shortening, 2.24 days.
- Observation Suwon ＃82 showed the smallest ripening-period shortening, 0.78 days.
- Association Days to heading positively correlated with accumulated average air temperature during ripening.
- Association Culm length tended to decrease with later seeding, except among young seedlings sown May 21 to June 10.
- Association Ear length decreased with seedling age above 40 days, while remaining constant at 30 to 40 days.
- Association Panicles per hill first decreased and then increased with delayed seeding.
- Association Rachilla number decreased when seeding occurred after a marginal date dependent on seedling age.
- Association Defective-grain weight increased gradually then sharply with later seeding.
- Association The marginal ripening date occurred earlier with longer seedling stages: June 10 for 30 to 40 days and May 1 for 70 to 80 days.
- Association Thousand-grain weight was heaviest in ordinary culture and lower in early and late cultures.