水利用効率に注目したササゲ（Vigna unguiculata（L.）Walp.）の 窒素固定量評価の可能性

日本作物学会紀事

川﨑 友寛¹  角 明夫¹  菅田 慎平¹ 

[1] 鹿児島大学農学部

关键词: Bradyrhizobium;    ブラディリゾビウム;    Cowpea;    ササゲ;    Dry matter production;    乾物生産;    Evapotranspiration;    蒸発散;    Nitrate inhibition;    硝酸阻害;    Nitrogen fixation;    窒素固定;    Water use efficiency;    水利用効率;   

DOI  :  10.1626/jcs.84.192

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

To estimate the amount of fixed nitrogen (N), we compared the N absorption of cowpea with root nodules grown under 0 gN per pot conditions (0N cowpea) with that of corn grown under 0 gN (0N corn). We also compared the water use efficiency (WUE) of 0N cowpea with that of cowpea without nodules produced by growing with 5 gN per pot fertilization (5N cowpea). We noted that although the increase in total dry weight had stopped at the early growth period in 0N corn, it continued to increase in 0N cowpea that received a fixed N supply via the root nodules. Furthermore, we noted that growth was greatly inhibited in the 5N cowpea but WUE was kept high throughout the growth period. Although the WUE of 5N cowpea tended to remain nearly constant during the experimental period, that of 0N cowpea decreased with the increase in the amount of fixed nitrogen. From these results, we consider that the amount of fixed N can be estimated by comparing the WUE of cowpea without root nodules (no N fixation) with that of cowpea with root nodules (N fixation).

【 授权许可】

Unknown