@article{oai:niigata-u.repo.nii.ac.jp:00004033, author = {千葉, 雅大 and 松村, 修 and 寺尾, 富夫 and 高橋, 能彦 and 渡邊, 肇}, issue = {3}, journal = {日本作物學會紀事, 日本作物學會紀事}, month = {Jul}, note = {近年の気候温暖化で水稲の登熟期間中の気温が上昇し,白未熟粒の多発による品質低下が問題となっている.深水栽培は白未熟粒の発生抑制に有効であるが,効果の大きい水深18 cmの深水栽培が可能な圃場は限られる.そこで,高温登熟耐性が弱の初星と中程度のコシヒカリを用いて,慣行栽培と水深18 cmの強深水栽培に加えて,深水栽培と同様に分げつ発生を抑制する深植(植付深6 cm)と,比較的水深が浅い弱深水栽培(水深10 cm),および両者の組み合わせについて,水稲の生育と収量,品質に及ぼす影響を比較・検討した.その結果,初星では,深植した水稲に活着期から最高分げつ期にかけて水深10 cmの深水栽培を行うと,白未熟粒の発生が減少し,水深18 cmの深水栽培でみられた減収傾向はなく,収量が安定的に確保された.コシヒカリでは,水深18 cmの深水栽培をしても,有意に収量は低下せず,この栽培条件で品質が最も高かった.また,コシヒカリでも,深植水稲の水深10 cmの深水栽培では,有意な収量低下がなく,水深18 cmの深水処理に次いで白未熟粒割合も低くなった.深水栽培により,土壌の酸化還元電位が低下したが,登熟期の根系の機能に悪影響はみられなかった.深水栽培により明確な地耐力の低下はみられなかったことから,収穫時の機械作業に支障をきたす可能性は低いと考えられた., Suppression of the occurrence of chalky grains caused by a high temperature at the ripening stage of rice is an urgent issue in rice production in Japan. Deep flood irrigation with a water depth of 18 cm is an effective measure to avoid the occurrence. However, the area of paddy fields that can keep this level of water depth is limited, because the plants are usually not so high. Here, we examined the effects of flood irrigation at a water depth of 10 cm and deep planting (depth of 6 cm), and their combination on the yield and quality of rice using cultivars Hatsuboshi and Koshihikari which are sensitive and moderately tolerant to a high temperature at the ripening stage, respectively. In Hatsuboshi, deep planting combined with 10-cm irrigation from the rooting stage to the maximum tillering stage reduced the occurrence of chalky grains without yield reduction that was caused by an 18 cm flood irrigation. In Koshihikari, 18-cm flood irrigation was the best to reduce chalky grains, but 10-cm flood irrigation also reduced chalky grains significantly without significant yield reduction. Deep flood irrigation (18 cm) decreased the redox potential of soil, but did not damage the root system at the ripening stage. In addition deep flood irrigation did not reduce soil-bearing capacity, and was not considered to prevent combine harvestin.}, pages = {312--325}, title = {深水栽培による高品質米生産技術 : 深水処理の水深と期間および植付深が水稲の収量・品質に及ぼす影響}, volume = {80}, year = {2011} }