Abstract
This experiment was carried out in order to make clear the relation of the sowing time to the plant growth and rice yields. Sample varieties used for this experiment were extremely early-maturing varieties (Yukara and Sasahonami) and early-maturing varieties (Fujiminori and Koshijiwase). Seeds were sown in varied seeding density ranging over four times from the late May to early July. The authors tested the growth and yields affected by variations in sowing time. 1) Grain yields decreased linearly with the delay in sowing time, showing a decrease of 0.3 to 0.45 kg. per are per day. The decrease in yields from the yields in late May sown was at the rate of 0.5 to 0.9 per cent. This was thought that the reduction in yields was caused by decrease in the dry matter accumulation in panicles and by failure in full-ripeness. 2) The decrease in dry matter accumulation in panicles with the delay in sowing time was due to the reduction in the rate of increase in dry matter production during the ripening periods. The lowering of increasing rate in dry matter during the ripening periods was due to the decrease in the net assimilation rate and leaf dry weight, and affected greatly by the decrease in the net assimilation rate in the case of extremely early-maturing varieties and by the decrease in the leaf dry weight in the case of early-maturing ones. 3) The failure in full-ripeness by the delay in sowing time was due to the lowered ratio of "the quantity of dry matter accumulation in panicles per unit area" to "the number of hulls per unit area". namely, it was due to the rate of decrease in the number of hulls per unit area was less than that of decrease in the quantity of dry matter accumulation in panicles per unit area. 4) During the ripening period, the leaf dry weight in extremely early-maturing varieties were less than in early-maturing varieties, but net assimilation rate in extremely early-maturing ones was higher than in the early-maturing ones. As a result, no significant differeces were found in the rate of increase in dry matter weight between both varieties. Consequently, in the variation of sowing date no significant differences were found in yields between extremely early-maturing varieties and early-maturing ones. 5) Yukara showed higher yield than Sasahonami, and Fujiminori than Koshijiwase. This was ascribed to the fact that Sasahonami was very poor in ripeness (excess of hulls) and the dry matter increasing rate for Fujiminori was high throughout the entire plant growth period. There were generally a few differences in yields according to seeding density.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 16
Claim · model-written summary
Grain yield fell with later sowing by 0.3 to 0.45 kg per are per day.
- Taxon
- rice
Oryza sativat0 - Treatment
- delay in sowing timee0
- Outcome
- Grain yieldse0
- Direction
- decreasede0
- Value
- 0.3 to 0.45 kg. per are per daye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain yields decreased linearly with the delay in sowing time, showing a decrease of 0.3 to 0.45 kg. per are per day”
t0“Studies on the Short Period Cultivation of Direct Sown Rice Plant : 4. Effect of the sowing time on the plant growth and rice yields”
Claim · model-written summary
Yield loss relative to late May sowing was 0.5 to 0.9 percent.
- Taxon
- riceOryza sativat0
- Treatment
- sowing timet0
- Outcome
- yieldse0
- Direction
- decreasee0
- Value
- 0.5 to 0.9 per cente0
- Comparator
- late May sowne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The decrease in yields from the yields in late May sown was at the rate of 0.5 to 0.9 per cent”
t0“Studies on the Short Period Cultivation of Direct Sown Rice Plant : 4. Effect of the sowing time on the plant growth and rice yields”
Claim · model-written summary
Delayed sowing reduced dry matter accumulation in panicles.
- Taxon
- riceOryza sativat0
- Treatment
- delay in sowing timee0
- Outcome
- dry matter accumulation in paniclese0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The decrease in dry matter accumulation in panicles with the delay in sowing time”
t0“Studies on the Short Period Cultivation of Direct Sown Rice Plant : 4. Effect of the sowing time on the plant growth and rice yields”
Claim · model-written summary
Delayed sowing impaired full ripeness.
- Taxon
- riceOryza sativat0
- Treatment
- delay in sowing timee0
- Outcome
- full-ripenesse0
- Direction
- failuree0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The failure in full-ripeness by the delay in sowing time”
t0“Studies on the Short Period Cultivation of Direct Sown Rice Plant : 4. Effect of the sowing time on the plant growth and rice yields”
Claim · model-written summary
Later sowing reduced the rate of dry matter production during ripening.
- Taxon
- riceOryza sativat0
- Outcome
- rate of increase in dry matter productione0
- Direction
- reductione0
- Qualifier
- ripening periodse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reduction in the rate of increase in dry matter production during the ripening periods”
t0“Studies on the Short Period Cultivation of Direct Sown Rice Plant : 4. Effect of the sowing time on the plant growth and rice yields”
Claim · model-written summary
Net assimilation rate decreased during ripening with later sowing.
- Taxon
- riceOryza sativat0
- Outcome
- net assimilation ratee0
- Direction
- decreasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decrease in the net assimilation rate and leaf dry weight”
t0“Studies on the Short Period Cultivation of Direct Sown Rice Plant : 4. Effect of the sowing time on the plant growth and rice yields”
Claim · model-written summary
Leaf dry weight decreased during ripening with later sowing.
- Taxon
- riceOryza sativat0
- Outcome
- leaf dry weighte0
- Direction
- decreasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decrease in the net assimilation rate and leaf dry weight”
t0“Studies on the Short Period Cultivation of Direct Sown Rice Plant : 4. Effect of the sowing time on the plant growth and rice yields”
Claim · model-written summary
Extremely early varieties had lower ripening leaf dry weight than early varieties.
- Taxon
- riceOryza sativat0
- Material
- extremely early-maturing varietiese0
- Outcome
- leaf dry weighte0
- Direction
- less thane0
- Comparator
- early-maturing varietiese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the leaf dry weight in extremely early-maturing varieties were less than in early-maturing varieties”
t0“Studies on the Short Period Cultivation of Direct Sown Rice Plant : 4. Effect of the sowing time on the plant growth and rice yields”
Claim · model-written summary
Extremely early varieties had higher net assimilation rate than early varieties.
- Taxon
- riceOryza sativat0
- Material
- extremely early-maturing onese0
- Outcome
- net assimilation ratee0
- Direction
- highere0
- Comparator
- early-maturing onese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“net assimilation rate in extremely early-maturing ones was higher than in the early-maturing ones”
t0“Studies on the Short Period Cultivation of Direct Sown Rice Plant : 4. Effect of the sowing time on the plant growth and rice yields”
Claim · model-written summary
Dry matter increase rate did not differ significantly between maturity groups.
- Taxon
- riceOryza sativat0
- Material
- both varietiese0
- Outcome
- rate of increase in dry matter weighte0
- Direction
- no significant differecese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no significant differeces were found in the rate of increase in dry matter weight between both varieties”
t0“Studies on the Short Period Cultivation of Direct Sown Rice Plant : 4. Effect of the sowing time on the plant growth and rice yields”
Claim · model-written summary
Yield did not differ significantly between maturity groups across sowing dates.
- Taxon
- riceOryza sativat0
- Material
- extremely early-maturing varietiese0
- Outcome
- yieldse0
- Direction
- no significant differencese0
- Comparator
- early-maturing onese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no significant differences were found in yields between extremely early-maturing varieties and early-maturing ones”
t0“Studies on the Short Period Cultivation of Direct Sown Rice Plant : 4. Effect of the sowing time on the plant growth and rice yields”
Claim · model-written summary
Yukara yielded more than Sasahonami.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yukara showed higher yield than Sasahonami”
t0“Studies on the Short Period Cultivation of Direct Sown Rice Plant : 4. Effect of the sowing time on the plant growth and rice yields”
Claim · model-written summary
Fujiminori yielded more than Koshijiwase.
- Taxon
- riceOryza sativat0
- Material
- Fujiminorie0
- Outcome
- Fujiminori than Koshijiwasee0
- Direction
- thane0
- Comparator
- Koshijiwasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fujiminori than Koshijiwase”
t0“Studies on the Short Period Cultivation of Direct Sown Rice Plant : 4. Effect of the sowing time on the plant growth and rice yields”
Claim · model-written summary
Sasahonami had poor ripeness.
- Taxon
- riceOryza sativat0
- Material
- Sasahonamie0
- Outcome
- ripenesse0
- Direction
- very poore0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sasahonami was very poor in ripeness (excess of hulls)”
t0“Studies on the Short Period Cultivation of Direct Sown Rice Plant : 4. Effect of the sowing time on the plant growth and rice yields”
Claim · model-written summary
Fujiminori had a high rate of dry matter increase throughout growth.
- Taxon
- riceOryza sativat0
- Material
- Fujiminorie0
- Outcome
- dry matter increasing ratee0
- Direction
- highe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“dry matter increasing rate for Fujiminori was high throughout the entire plant growth period”
t0“Studies on the Short Period Cultivation of Direct Sown Rice Plant : 4. Effect of the sowing time on the plant growth and rice yields”
Claim · model-written summary
Yield differed little across seeding densities.
- Taxon
- riceOryza sativat0
- Treatment
- seeding densitye0
- Outcome
- yieldse0
- Direction
- a few differencese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There were generally a few differences in yields according to seeding density”
t0“Studies on the Short Period Cultivation of Direct Sown Rice Plant : 4. Effect of the sowing time on the plant growth and rice yields”
The same questions in other papers
sowing time · yield · Oryza sativa (rice)Positive and negative results
69 papers in the same direction as this paper · 123 in the opposite direction
- positive
- positive
- positive
189 papers more in this group
See all 193 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.