Detection of Leaf Area Expansion Promoted by Additional Fertilizer Application on Farmer’s Paddy Fields Using Multispectral Images

日本作物學會紀事

article

橋本 直之¹  齋藤 裕樹¹  山本 修平¹  牧 雅康²  本間 香貴¹ 

[1] 東北大学大学院農学研究科;福島大学農学群食農学類

关键词: Effect of fertilizer;    Leaf area index;    Paddy field;    Remote sensing;    Unmanned aerial vehicle.;   

DOI  :  10.1626/jcs.90.211

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

To monitor the effect of additional fertilizer application, we measured leaf area expansion in farmer’s paddy fields using multispectral images (MS images) collected using unmanned aerial vehicles (UAV). Leaf area index (LAI) growth rate (LGR), which is defined as the slope of linear regression for time-series LAI, was used for evaluation. The image analysis, which considered fluctuations of solar radiation conditions, was applied to obtain LAI from images, and compared with LAI measured by LAI-2200. Three levels of ammonium sulfate (0, 10, 15 g m -2 ) were set as additional fertilizer treatments in 4 transplanted fields (2 Hitomebore, 2 Manamusume and 1 Datemasayume) and 4 direct seeded fields(Hitomebore)of a juridical agricultural union in Sendai (total 72 test plots, the area of which was 3 x 3 m). The additional fertilizer increased the number of panicles. However, there were no significant effects on the yield components. Both LAI-2200-based and MS-image-based LGRs at the center of the plot revealed significant effects only for the transplanted Hitomebore. However, significant effects were detected in both transplanted and direct seeded test plots in LGRs between the center and outside area (2 m from center) based on MS images. These results imply that the MS image by UAV can be used to monitor the effects of the fertilizer applied. The method will be useful to determine the optimal amount of fertilizer for each field by optimizing LAI growth.

【 授权许可】

Unknown