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基于PCA_SVR的油菜氮素光谱特征定量分析模型（Rape Nitrogen Content Spectral Character Models Based on PCA_SVR Method）
油菜 氮素 光谱分析
2009/5/22
研究了采用光谱分析技术对油菜植株全氮进行定量分析的方法。采用逐步回归法对氮素的光谱特征波长进行选择，为克服光谱变量间多重共线性的影响，对变量进行了主成分分析（PCA），为提高模型的拟合优度，应用支持向量机回归(SVR)建立油菜氮素的定量分析模型。对不同氮素水平的油菜冠层光谱数据进行分析，结果表明，406、460、556、634、662、675nm的光谱反射率与油菜含氮量呈极显著相关。植株全氮SVR...
Effect of the change of accompanying cation of mineral nitrogen fertilizers on soil physical properties
slaking structural properties loamy soil Na and Ca as cations
2008/11/19
abstract50 cm increased and the slaking resistance decreased on those plots. The other soil structural properties determined were not significantly affected. The reason behind these unexpected finding...
Environmental impact of emissions from the nitrogen fertilizerplant in Pu砤wy
nitrogen works Puł awy emissions environmental impact
2008/11/19
The impact of the nitrogen fertilizer plant in Puławy involved profound, destructive alterations to the broad-sense natural environment which comprised not only the soil, water and air but also p...
Influence of nitrogen fertilization of winter wheat on its gluten quality
winter wheat N-fertilization protein wet gluten gluten index
2008/11/14
Five winter wheat varieties grown in 1992-95 at two levels of the nitrogen fertilization: 50 and 150 kgN/ha, were tested. Protein content, wet gluten content and gluten index value were examined. Glut...
Nitrogen content and its uptake by maize as influenced by some meteorological elements and fertilization
maize N content N uptake temperature saturation deficit
2008/11/13
The experiment was conducted during the period 1982�1987 at the field station Sredec, Stara Zagora region on leached Smolnitza soil. Two maize hybrids (300 and 700 FAO) grown under irrigation a...
Seasonal changes in labile organic matter, mineral nitrogen, and N2O emissionin a loamy sand Orthic Luvisol cultivated under three management practices
labile organic matter mineral nitrogen N2O emission management practices growing period
2008/11/12
Valid evaluation of soil quality requires better understanding of short- and long-term responses of key biochemical and microbiological soil properties to seasonal changes and types of management prac...
Specific surface area of Lublin Polesie mucks determined from water vapour and nitrogen adsorption data
specific surface area mucks adsorption of water vapour and nitrogen
2008/11/11
Laboratory studies of nitrogen and water vapour adsorption on mucks originating from Lublin Polesie Region are presented. The Brunauer-Emmet and Teller (BET) equation was used to analyze the experime...
Changes in the structure of nitrogen-containing compounds of peat, sapropel, brown coal and organic fertilizers on their basis
peat sapropel brown coal organic fertilizers nitrogen products degradation amino acids
2010/1/15
The three-stage acidic hydrolysis method was used for the degradation of three organic fertilizers prepared on the basis of peat, sapropel and brown coal. This method of hydrolysis may simulate the pr...