塩分布の異なる土壌における灌漑方法と苗齢の違いがイネの生育と収量に及ぼす影響

日本作物学会紀事

掛橋 孝洋¹  平井 儀彦²  津田 誠² 

[1] 岡山大学農学部;岡山大学大学院環境生命科学研究科

关键词: イネ;    塩土壌;    間断灌漑;    乳苗;    æ ¹;    Rice;    Saline soil;    Intermittent irrigation;    Seedling age;    Root;    Submerged soil conditions;   

DOI  :  10.1626/jcs.85.115

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

We investigated the effect of transplanting young seedlings and intermittent irrigation on the growth and yield of rice on the soil with three profiles of salinity. Fifteen-liter pots were filled with non-saline soil (non-saline plot), with the soil to which 45 g of salt was applied to all layers of the soil (homogeneous saline plot), and with the soil to which 45 g of salt was applied to the lower half layer (heterogeneous saline plot). Younger and older seedlings of paddy rice Nipponbare, at leaf ages of 2.5 and 4.7, respectively were transplanted to these pots, one seedling per pot. Then plants were subjected to continuously submerged soil conditions, or intermittent irrigation. In the non-saline plot, growth of young and older seedlings was poorer in intermittent irrigation than in submerged soil conditions. In the homogenous saline plot, young seedlings died soon after the transplanting and older seedlings survived longer under submerged soil conditions. Salinity distribution was not changed much in submerged soil conditions, but salinity moved up under intermittent irrigation regardless of initial salinity distribution. We concluded that transplanting young seedlings was not acceptable in saline soil because their salinity tolerance was low. Intermittent irrigation was not preferable, because it promoted the accumulation of salt in the upper soil layer. On the other hand, low salinity in the upper soil layer improved seedling survival and early growth. The results suggest that the upper layer should be low in salinity, and the plants should be grown under submerged soil conditions to produce healthy rice plants.

【 授权许可】

Unknown