成熟期レンゲの窒素無機化特性およびその鋤きこみが湿田での 水稲の窒素吸収と収量に及ぼす影響

日本作物学会紀事

金澤 裕美¹  南雲 俊之¹  久保 田恭子¹  大井 友紀子¹ 

[1] 静岡大学農学部

关键词: Chinese Milk Vetch;    レンゲ;    Gley Soil;    グライ土;    Green Manure;    ç·‘è‚¥;    Mineralization;    無機化;    Nitrogen;    窒素;    Paddy Rice;    水稲;   

DOI  :  10.1626/jcs.83.15

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

Chinese milk vetch (CMV) (Astragalus sinicus L.) at flowering-stage is a green manure traditionally used as alternative basal nitrogen in paddy rice fields. In order to evaluate the nitrogen availability of mature-stage CMV, compared with the flowering-stage CMV, we carried out field cultivation and incubation studies using ill-drained Gley soil with either mature-stage CMV incorporated. The results showed that mature-stage CMV provided less available nitrogen for early rice growth than the fresh flowering-stage CMV, resulted in lower panicle number and hence lower total grain number of rice. Contrary to our expectation, which mature-stage CMV replace nitrogen topdressing due to the prolonged nitrogen mineralization, the small amount of the mineralized nitrogen was insufficient to support the rice growth. Nevertheless, rice cultured with the mature-stage CMV achieved a yield over 450 g m-2, without the use of agrochemicals. Mature-stage CMV was suggested to be potentially applicable under ill-drained soil conditions, if applied heavily.

【 授权许可】

Unknown