ハトムギ (Coix lacryma-jobi L. var frumentacea Makino) における栽植密度と生育·収量の関係

日本作物学会紀事

中野 尚夫¹  氏平 洋二²  石田 喜久男² 

[1] 島根大学;岡山県立農業試験場

关键词: Diameter of stem;    茎径;    Planting density;    栽植密度;    Yield;    収量;    Yield component;    収量構成要素;    Dry weight;    生育量;    Number of node;    節数;    Job’s-tear;    ハトムギ;    分枝発生;   

DOI  :  10.1626/jcs.72.32

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

Job’s-tears (Coix lacryma-jobi L. var frumentacea Makino), cv. Hatochikara was sown in an upland field converted from a paddy field at the densities of 2.8, 5.6, 6.3, 8.3, 11.1, 16.0 and 25.0 hill per m2. The dry weights of the stems and leaves and grain yield increased as the planting density increased up to 11.1 hill per m2. As the planting density increased further the dry weights of stems and leaves gradually increased but that of the grains decreased, and thus their sum remained at the same level. The dry weights of stems and leaves highly correlated with the number of stems (r=0.884**) and total number stem nodes (r=0.829**). The number of stems per plant was decreased by dense planting due to the reduced stem emergence and decreased survival rate of the stems. The number of bracts increased as the planting density increased up to 11.1 hill per m2, but slightly decreased at the higher density. The higher the planting density, the smaller the stem diameter, the lower the number of bracts. These results suggested that the number of bracts was reduced by dense planting through the reduced growth of stems. The number of kernels and grain yield highly correlated with the number of bracts, though the sterile kernels slightly increased as the planting density increased. From these results it was suggested that the decrease in grain yield caused by dense planting would be attributable mainly to the suppression of the emergence and growth of stems.

【 授权许可】

Unknown