Abstract
Pot tests were attempted at Faculty of Agriculture, Okayama University in 1963 as to the relationship of seeding density to plant growth and rice yield in case where rice seed was sown by broadcasting by hand directly on the submerged paddy field. Size of each pot: 1 meter long, 0.8 meter in width, and 1 meter in depth. Sample rice variety: PI-5. Tests were made by four replications as to the seven plots (from 30-hill plot to 210-hill plot) aligned at random. Fertilizers were applied according to the customary practice. Test results can be summarized as follows : (1) At the earlier plant growth stage, culm height of rice plants in the densely sown plots was higher than that in the sparsely sown ones, but vice versa at the later plant growth stage. (2) At the peak tillering stage, the number of tillers per unit area in the densely sown plots showed an increase over that in the sparsely sown ones, but after that stage, the former showed a marked decrease in the number of tillers. At the harvesting time, the number of panicles in 90-hill plot was greatest, reaching 502 panicles per square meter and that in 30-hill plot was smallest, showing 304 panicles and that in the plot sown more densely showed a decrease to about 405 panicles. (3) Rice yield in 90-hill plot was highest. This is due to the greatest number of panicles therein. (4) Rice yield in the plots sown densely more than 120 hills was lower than that in 90-hill plot. This can be ascribed to the inadequate amount of the customary fertilizer application for the densely sown plots in the later plant growth stage. Consequently, if improved split-application practice be designed, rice yield in the densely sown plots would show more favorable trend than that in other plots.
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Claims 11
Claim · model-written summary
Dense sowing gave higher rice culm height early than sparse sowing.
- Taxon
- rice
Oryza sativae0 - Organ / stage
- earlier plant growth stagee0
- Treatment
- densely sown plotse0
- Outcome
- culm heighte0
- Direction
- highere0
- Comparator
- sparsely sown onese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At the earlier plant growth stage, culm height of rice plants in the densely sown plots was higher than that in the sparsely sown ones”
Claim · model-written summary
The early culm height ranking reversed later.
- Taxon
- riceOryza sativae0
- Organ / stage
- later plant growth stagee0
- Treatment
- densely sown plotse0
- Outcome
- culm heighte0
- Direction
- vice versae0
- Comparator
- sparsely sown onese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At the earlier plant growth stage, culm height of rice plants in the densely sown plots was higher than that in the sparsely sown ones, but vice versa at the later plant growth stage.”
Claim · model-written summary
Dense sowing increased tillers per unit area at peak tillering.
- Taxon
- RiceOryza sativat0
- Treatment
- densely sown plotse0
- Outcome
- number of tillers per unit areae0
- Direction
- increasee0
- Comparator
- sparsely sown onese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At the peak tillering stage, the number of tillers per unit area in the densely sown plots showed an increase over that in the sparsely sown ones”
t0“Rice”
Claim · model-written summary
Tillers in dense plots decreased markedly after peak tillering.
- Taxon
- RiceOryza sativat0
- Outcome
- number of tillerse0
- Direction
- decreasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“after that stage, the former showed a marked decrease in the number of tillers.”
t0“Rice”
Claim · model-written summary
At harvest, 90-hill plots had the greatest panicle number, 502 per square meter.
- Taxon
- RiceOryza sativat0
- Treatment
- 90-hill plote0
- Outcome
- number of paniclese0
- Direction
- greateste0
- Value
- 502 panicles per square metere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At the harvesting time, the number of panicles in 90-hill plot was greatest, reaching 502 panicles per square meter”
t0“Rice”
Claim · model-written summary
At harvest, 30-hill plots had the smallest panicle number, 304.
- Taxon
- RiceOryza sativat0
- Treatment
- 30-hill plote0
- Outcome
- paniclese0
- Direction
- smalleste0
- Value
- 304 paniclese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“that in 30-hill plot was smallest, showing 304 panicles”
t0“Rice”
Claim · model-written summary
More densely sown plots had about 405 panicles, lower than the 90-hill plot.
- Taxon
- RiceOryza sativat0
- Treatment
- plot sown more denselye0
- Outcome
- paniclese0
- Direction
- decreasee0
- Value
- about 405 paniclese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“that in the plot sown more densely showed a decrease to about 405 panicles.”
t0“Rice”
Claim · model-written summary
Rice yield was highest in the 90-hill plot.
- Taxon
- RiceOryza sativae0
- Treatment
- 90-hill plote0
- Outcome
- Rice yielde0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice yield in 90-hill plot was highest.”
Claim · model-written summary
Rice yield above 120 hills was lower than in the 90-hill plot.
- Taxon
- RiceOryza sativae0
- Treatment
- plots sown densely more than 120 hillse0
- Outcome
- Rice yielde0
- Direction
- lowere0
- Comparator
- 90-hill plote0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice yield in the plots sown densely more than 120 hills was lower than that in 90-hill plot.”
Claim · model-written summary
The authors attributed lower dense-plot yield to inadequate customary fertilizer in later growth.
- Taxon
- RiceOryza sativae1
- Treatment
- customary fertilizer applicatione0
- Outcome
- Rice yielde1
- Qualifier
- inadequate amounte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This can be ascribed to the inadequate amount of the customary fertilizer application for the densely sown plots in the later plant growth stage.”
e1“Rice yield in the plots sown densely more than 120 hills was lower than that in 90-hill plot.”
Claim · model-written summary
Improved split fertilizer application may make dense-plot rice yield more favorable.
- Taxon
- riceOryza sativae0
- Outcome
- improved split-application practicee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“if improved split-application practice be designed, rice yield in the densely sown plots would show more favorable trend than that in other plots.”