期刊论文详细信息
日本作物学会紀事
デジタルカメラを利用した水稲群落葉色の評価法
千田 野風生1  韓 東生2  渡邊 肇2  高橋 能彦2 
[1] 新潟大学大学院自然科学研究科;新潟大学農学部
关键词: Chlorophyll meter;    葉緑素計;    Digital camera;    デジタルカメラ;    Image analysis;    画像解析;    Leaf color;    葉色;    Leaf color chart;    葉色票;    Nutritional diagnosis;    栄養診断;    Rice;    水稲;   
DOI  :  10.1626/jcs.84.432
学科分类:农业科学(综合)
来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan
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【 摘 要 】

Paddy rice chlorophyll meters can measure leaf color values in real time. Because of that accumulation of test data, it is becoming increasingly popular in research on paddy rice cultivation, as well as in extension services and education organizations. However, the meter only measure one section of each leaf. To obtain representative values, we need to measure of several points on each leaf, and thus it is time consuming. In recent years, photographs taken by common household digital cameras have been used to evaluate canopy color in paddy rice. In this study we assessed the efficiency and accuracy of this method. We separated color images of paddy rice canopies into RGB images, using commonly available image analysis software, and binarized these images. We then compared the synthetic image with the original color image. We copied the paddy rice leaf color chart onto the lower part of the screen when taking photographs, to act as color standards, and created calibration curves. For each of the three relevant growth stages (maximum-tiller-number, panicle formation, and nine days before heading), the correlation coefficient between the leaf color chart value and the measured leaf color value (chromaticity) was r=0.80 or above, and the relationship was significant. This method allows more efficient evaluation of rice paddy nutrition than the use of chlorophyll meters. Furthermore, it give valuable information for making decisions about topdressing, which is done to prevent the degradation of rice that can occur during ear ripening at high temperatures.

【 授权许可】

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