22 December 2003 Determining growth-and yield-limiting factors in potato from canopy spectral reflectance
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Irrigated potato production in sandy soils can be impacted by low nitrogen (N) and water retention in the soil. A field study was conducted to use canopy spectral reflectance as a primary means to characterize N fertilizer rates and soil texture variations as growth and yield limiting factors in potato. A hand-held 16-band spectral radiometer was used to obtain reflectance readings of the potato canopies. Reflectance measurements were made in field plots that received four rates of N or in four areas where the soil textures were different. At later stages of plant growth, canopy reflectance in the 760 to 1000 nm spectral range was consistently higher in plots that received higher rates of N or in areas where the soil contained higher clay and silt fractions. Russet Burbank potatoes, with increasing rate of N fertilizer, showed a decreasing trend in total tuber yield and an increasing trend in percent of tubers with weight exceeding 170 g. Canopy reflectance was inversely related to tuber yield or size for Russet Burbank potatoes when soil texture was the only variable.
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Dong Wang and Carl J. Rosen "Determining growth-and yield-limiting factors in potato from canopy spectral reflectance", Proc. SPIE 5153, Ecosystems' Dynamics, Agricultural Remote Sensing and Modeling, and Site-Specific Agriculture, (22 December 2003); doi: 10.1117/12.514560; https://doi.org/10.1117/12.514560

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