Claim · model-written summary
Varieties with a greater yield decrease under sub-soiling showed a greater decrease in the ratio.
- Taxon
- rice plant
Oryza sativae0 - Material
- varieties which showed greater extent of yield decrease by sub-soilinge1
- Outcome
- the ratioe1
- Direction
- greater decreasee1
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“varieties which showed greater extent of yield decrease by sub-soiling were accompanied with greater decrease in the ratio”
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 fewer spikelets per ear tended to gain higher yield under sub-soiling because their ripened-grain percentage fell less.
- 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.
- 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.
Zea mays subsp. mays
Brassica oleracea var. italica