水稲の不耕起直播無覆土湛水栽培における湛水深とY字型播種溝が幼苗の生育に及ぼす影響

概要

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The effects of flooding depth and Y-shaped seeding furrow on the growth of rice seedlings were investigated under the conditions of non-tilled direct seeding in poorly drained paddy soil. 1) The effects of flooding depth on the growth of rice seedlings at 12 and 20℃ were as follows : 10 cm>3 cm>1 cm, and the growth rate of seedlings at 12℃ was about one-fifth of that at 20℃. 2) The growth rates of plumules, calculated using total effective temperature, were almost the same at 12 and 20℃. Radicle elongation started at the total effective temperature of 25℃, and the degree of radicle elongation at 12℃ was larger than that at 20℃. 3) The percentages of seedling establishment of surface sown and V-shaped furrrow sown plots were extremely lower (0-5%) than those of V-shaped furrrow and Y-shaped furrow burried plots (62-76%). 4) The radicle elongation, plant length and leaf age of rice seedlings were much improved in the Y-shaped furrrow burrled plot as compared to the V-shaped furrrow burried plot. From the above results, it was concluded that the Y-shaped furrow system without covering soil is most feasible for non-tilled direct seeding in poorly drained paddy fields.
社団法人日本土壌肥料学会の論文
1997-10-05