Growth and Yield Performance of the Water Chestnut (Trapa bispinosa Roxb.) : II. Relationship among the canopy formation of emersed leaves, flowering and the number of valuable fruits

Japanese Journal of Crop Science

Jirou HARADA¹  Noriyuki TANAKA¹  Susumu ARIMA¹ 

关键词: Fertilization;    遮光栽培;    Paddy field cropping;    収量;    Shade culture;    水温;    Trapa bispinosa Roxb.;    水田栽培;    Vinyl house culture;    トウビシ;    Water chestnut;    ハウス栽培;    Water temperature;    ヒシ;    Yield;   

DOI  :  10.1626/jcs.61.229

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

The relationship between the canopy formation and yield performance of Trapa bispinosa Roxb. in paddy fields was investigated under the following six conditions: vinyl house culture (VH); shade culture (SC); and open field culture (OP); with and without fertilizer (F). The speed of the canopy formation varied with treatments, and the formation of the complete canopy of emersed leaves was hastened in the following order :VH+F>VH>OP+F>OP>SC+F>SC. The number of productive rosettes tended to increase corresponding to the earliness of the maximum rosette number stage. Furthermore, the variation at about 20 days was observed during the first flowering time to correspond to that during the maximum rosette number stage. Yield varied from 506 to 1190 gm-2 and increased under the condition of early canopy formation. The cumulative number of flowers per rosette ceased to increase at the same time, regardless of the timing of the first flowering, which showed a significant correlation with the timing of the first flowering. Also, high correlations were seen between the maximum rosette number stage and the first flowering, and between the cumulative number of flowers and the number of valuable fruits per rosette. Therefore, it can be proved that the increase in number of valuable fruits per rosette depends on the increase in the cumulative number of flowers per rosette owing to a prolonged flowering period, which arises from the promotion in canopy formation and commencement of flowering.

【 授权许可】

Unknown