Effects of deep-flooding irrigation on the growth, canopy structure and panicle weight yield under different planting patterns in rice [Oryza sativa]
2010
Ohe, M., Osaka Prefecture Univ., Sakai (Japan) | Okita, N. | Daimon, H.
For rice cultivation in Japan, deep-flooding irrigation is used as a growth control method. To clarify the effects of deep-flooding cultivation under the different planting-pattern, we arranged conventional (Con, 22 hills/square m), narrow (Nar, 33 hills/square m) and very narrow (broadcast direct-seeding Model: BDSM, 100 hills/square m) planting plots under shallow-flooding (SF: 5 cm) and the deep-flooding (DF: 27 cm) conditions from active to maximum tillering stage and evaluated the growth, panicle weight yield, panicle components and community structure. DF was effective in controlling the weak tiller over the whole planting plots arranged. The panicle weight yield (per square m) was high in DF and high yield was kept even in BDSM. The panicle weight yield (per square m) increases in DF was based on the panicle weight (per panicle) increased by increasing secondary rachis-branches and their grains (Con and Nar), or on the panicle numbers (per square m) increase (BDSM). Shoot nitrogen content (per tiller), reported to have the correlation with panicle components, was high in the Con and Nar in DF, and this might contribute to the increase in secondary rachis-branch grains. In BDSM in DF, the marked decrease in the percentage of productive tillers and serious lodging observed in SF were improved. The lodging resistance value in DF was higher than that in SF over the whole planting plots. The light transmission in DF was superior to that in SF in spite of the large LAI. Thus, the growth improving effect of DF was obvious over the wide planting pattern range.
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