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大豆叶片氮素含量检测装置的研究 被引量:2
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作者 梁留锁 马旭 乔欣 《农机化研究》 北大核心 2010年第12期121-124,共4页
根据大豆叶片氮素含量光谱检测技术研究结果,设计了具有4个通道、两种检测模式的便携式检测装置,分别采用540nm波段冠层反射率和比值植被指数RVI检测大豆开花前期和结荚前期叶片氮素含量。该装置由敏感波段光电传感器、信号放大电路、A/... 根据大豆叶片氮素含量光谱检测技术研究结果,设计了具有4个通道、两种检测模式的便携式检测装置,分别采用540nm波段冠层反射率和比值植被指数RVI检测大豆开花前期和结荚前期叶片氮素含量。该装置由敏感波段光电传感器、信号放大电路、A/D转换器和单片机系统构成。单片机系统内建立了敏感波段冠层反射率及相关植被指数与大豆氮素含量的反演模型,可直接根据冠层反射率反演出大豆叶片氮素含量,也可通过串口通讯将反射率数据传给上位机进行进一步的处理。经田间试验验证,该仪器具有质量轻、价格低、操作简便和检测精度可行等优点,可以为大豆氮肥合理施用提供指导。 展开更多
关键词 大豆冠层 作物营养含量 光谱反射率 氮素检测
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Use of Human Urine (ALW) in Cultivation of Radish
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《Journal of Agricultural Science and Technology(B)》 2012年第5期574-578,共5页
Inefficient fertilizer use can lead to deficient soil nutrition. There is little information on whether human urine (ALW) can be used as a nutrient source in crop cultivation. A study was conducted to explore the po... Inefficient fertilizer use can lead to deficient soil nutrition. There is little information on whether human urine (ALW) can be used as a nutrient source in crop cultivation. A study was conducted to explore the potential of human urine in cultivation of radish (Raphanus sativus L.). The ALW was provided to radish in a pot trial. Comparison was with combinations of using synthetic fertilizers. Human urine contained N (0.45%), P (0.18%), K (0.16%), Ca (4.25 me Ll), Mg (5.15 me L"t) and Na (0.36%). The highest available nutrients N, P and K contents in soil at harvest, and the more number of leaves, tallest, root length, root yield and root diameter were from the in 3:1 ALW--three parts of ALW (human urine and one part of water used pot). Water treatment applied in two splits compared to the recommended fertilizer rate (75:37.5:37.5 kg hal of N, P and K) and absolute control (no fertilizer and no ALW added). 展开更多
关键词 Raphanus sativus ALW development GROWTH NITROGEN PHOSPHORUS potassium.
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Elemental Content in Wheat Products of Asir Region, Saudi Arabia
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作者 Omar Abdulrahman Fahad A1-Dayel Saad Ali. AlKahtani 《Journal of Chemistry and Chemical Engineering》 2010年第5期8-13,共6页
Wheat is one of the most grown crops in Saudi Arabia. Accurate knowledge of the various elemental concentrations in wheat and its products (bran and flower) is of great importance from nutrition point of view. Wheat... Wheat is one of the most grown crops in Saudi Arabia. Accurate knowledge of the various elemental concentrations in wheat and its products (bran and flower) is of great importance from nutrition point of view. Wheat samples were obtained from Asir region, 900 Km southern of Riyadh, and analyzed. Up to 50 elements in wheat products were determined. It was observed that the mineral content of bran was much higher than white flour. 展开更多
关键词 WHEAT BRAN SEMOLINA neutron activation analysis (NAA).
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