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Carbohydrate and nitrogen reserves in two cultivars of Japanese plum grown under organic and conventional management
Prunus salicina organic farming reserves defoliation tree vigor
2018/3/6
Nitrogen and carbohydrate (soluble sugars and starch) reserves were analysed in twig samples of ‘Red Beaut’ and
‘Showtime’ Japanese plum (Prunus salicina Lindl.) cultivars cultivated in two similar e...
便携式作物氮素监测仪性能水稻田间测试(Evaluation of Portable Crop Nitrogen Monitoring Instrument Based on Rice Field Experiment)
水稻 氮素含量 监测仪
2010/12/29
设计了2个品种和4个施氮水平的水稻田间试验,采用自行研制的便携式作物氮素监测仪获取各关键生育期的水稻冠层反射光谱信息,并实施田间协同取样和实验室氮素含量测定。通过分析水稻叶片氮含量与冠层光谱反射率及植被指数之间的相关性和定量关系,测试并评价便携式作物氮素监测仪的工作性能。结果表明,便携式作物氮素监测仪具有优异的氮素监测效果和优良的田间工作性能,在其所具备的4个特征波段中,660、710和810n...
便携式叶绿素、氮素、水分一体化测定仪设计(Development of a Portable Meter for Detecting Chlorophyll, Nitrogen and Water Contents of Plants)
作物叶片 检测 养分
2009/11/3
建立了可以同时检测作物叶片叶绿素、氮素和水分的数学模型。结合光谱学原理,设计了由近红外LED光源、窄带干涉滤光片、光电检测芯片以及单片机系统组成的作物叶片叶绿素、氮素、水分检测一体化便携式仪器,避免现有仪器由于叶片位置和测定时间差异导致的作物养分探测误差,可用于作物养分和水分的精细管理。
水稻氮素机器视觉诊断最佳叶位和位点的选择研究(Determination of Suitable Leaf for Nitrogen Diagnosis in Rice Based on Computer Vision)
水稻 氮素 机器视觉 叶位 位点 变异系数
2010/5/5
选用扫描仪获取水稻叶片的数字图像,通过比较第1和第3完全展开叶 (L1和L2) 颜色参量的空间分布,研究基于机器视觉技术的水稻氮素诊断的最佳叶位和位点选择。结果表明基于机器视觉的水稻氮素营养诊断是有理论依据的,能反映出叶片的营养状况; 选择B、b、b/(r+g)、b/r、b/g作为最优颜色特征参量;比较颜色特征参量对应的变异系数CV,得到低氮处理的CV明显高于正常氮素水平,同时CV随着叶位的增...
Nitrogen conversion and nitrous oxide hot spots in energy crop cultivation
nitrogen fertilisation level N2O soil flux cultivated and non-cultivated soils perennial and annual plants
2014/2/27
Since 1999, nitrous oxide (N2O) soil emissions from sites cultivated with energy plants have been measured by gas chromatography and gas flux chambers in experimental fields. The main aim of this stud...