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首页> 外文会议>Conference on ecosystems' dynamics, agricultural remote sensing and modeling, and site-specific agriculture >Determining growth-and yield-limiting factors in potato from canopy spectral reflectance
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Determining growth-and yield-limiting factors in potato from canopy spectral reflectance

机译：从冠层谱反射率确定土豆的生长和产量限制因子

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摘要

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.
机译：砂土中的灌溉马铃薯生产可能受到低氮（N）和土壤中的水保留的影响。进行了田间研究以使用冠层光谱反射作为初级手段，以表征N肥料率和土壤纹理变异作为马铃薯的生长和产量限制因素。手持式16波段光谱辐射计用于获得马铃薯檐篷的反射率读数。在现场图中进行了反射率测量，该地块是在土壤纹理不同的四个区域或四个区域的场图中进行。在植物生长的后期阶段，在760至1000nm光谱范围内的冠层反射率在接受较高的N或土壤含有更高粘土和淤泥级分的区域的速率下始终如一。汝座伯班土豆随着氮肥率的增加，总块茎产量的趋势降低，重量超过170克的块茎百分比增加。当土壤纹理是唯一变量时，树冠反射率与罗布伯银土豆的块茎产量或大小相反。

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