Claim · model-written summary
Varieties with fewer spikelets per ear tended to gain higher yield under sub-soiling because their ripened-grain percentage fell less.
- Taxon
- rice plant
Oryza sativae0 - Material
- varieties with relatively less spikelets per eare1
- Outcome
- yielde1
- Direction
- highere1
Not reportedGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleTreatmentComparatorSettingValueQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sub-soiling method, breaking sub-soil and not mixing to surface soil, was tested with regard to the growth and yield of rice plant”
e1“the varieties with relatively less spikelets per ear were inclined to gain higher yield owing to less decrease in percentage of ripened grains”
Title
Studis on Sub-Soiling in Paddy Field
Hiroyuki TAKAHASHI; Yasuo TAKAHASHI; Hiroshi IKEDA Japanese Journal of Crop Science 1962. doi:10.1626/jcs.31.98
Other claims from this paper (18)
- Intervention effect Sub-soiling kept the Eh value of the tilled soil zone higher than ordinary plowing.
- Intervention effect Sub-soiling widened the distribution of NH3-N in the soil compared with ordinary plowing.
- Intervention effect Under sub-soiling the root of rice plant was kept healthy, compared with ordinary plowing.
- Intervention effect Under sub-soiling the growth of rice plant was vigorous, compared with ordinary plowing.
- Intervention effect Under sub-soiling rice plants had increased numbers of ears and of grains per ear, compared with ordinary plowing.
- Intervention effect Under sub-soiling rice yield was unstable: higher in some cases and lower in others, compared with ordinary plowing.
- Intervention effect Under sub-soiling the percentage of ripened grains decreased, compared with ordinary plowing.
- Association Varieties with many spikelets per ear showed the opposite tendency under sub-soiling, with yield decreasing.
- Intervention effect Rice plants under sub-soiling had higher nitrogen content than under ordinary plowing.
- Intervention effect Rice plants under sub-soiling had lower carbohydrate content than under ordinary plowing.
- Association After heading, ferrous iron concentration in the tilled zone under sub-soiling increased markedly.
- Association Under sub-soiling the FeO content in rice plants increased.
- Association Under sub-soiling the P2O5/FeO ratio in rice plants decreased.
- Association Sub-soiling decreased the ratio of ear to straw in P2O5 content, which the authors read as impeded phosphorus translocation to the ear.
- Association Varieties with a greater yield decrease under sub-soiling showed a greater decrease in the ratio.
- Mechanism The authors hypothesise that the nutritional state of the plant with regard to iron could cause poor ripening of grain.
- Mechanism The authors hypothesise that high nitrogen and high FeO content of the plant may possibly cause the poor percentage of ripened grains under sub-soiling.
- Mechanism The authors hypothesise that high FeO content retards phosphorus translocation to the ear in rice plants.