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首页> 外文会议>Conference on Ecosystems' Dynamics, Agricultural Remote Sensing and Modeling, and Site-Specific Agriculture; Aug 7, 2003; San Diego, California, USA >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：通过冠层光谱反射率确定马铃薯的生长和产量限制因素

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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：沙质土壤中的灌溉马铃薯生产会受到土壤中低氮（N）和保水率的影响。进行了田间研究，以冠层光谱反射率作为表征氮肥施用量和土壤质地变化作为马铃薯生长和产量限制因素的主要手段。使用手持式16波段光谱辐射计获得马铃薯冠层的反射率读数。反射率测量是在田间样地中进行的，其中田地样地的氮含量为四种，或者在土壤质地不同的四个区域中。在植物生长的后期阶段，在760到1000 nm光谱范围内，冠层的反射率在氮素含量较高的地区或土壤中粘土和淤泥含量较高的地区始终较高。 Russet Burbank马铃薯随着氮肥施用量的增加，显示出块茎总产量下降趋势，而重量超过170 g的块茎百分比上升趋势。当土壤质地是唯一变量时，Russet Burbank马铃薯的冠层反射率与块茎产量或大小成反比。

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