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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...
STUDIES ON RESIDUES OF PESTICIDES USED IN RAPE PLANTS PROTECTION IN SURFACE WATERS OF INTENSIVELY EXPLOITED ARABLE LANDS IN WIELKOPOLSKA PROVINCE OF POLAND
pesticides insecticides water quality rape surface water
2010/12/22
Samples of surface waters of intensively exploited arable lands in Wielkopolska Province of Poland were collected in 2006 and 2007. The studies included 13 insecticides used in rape plants protection ...
Assessment of susceptibility of rape stems to shearing
winter rape stem dynamic shearing energy parameter DOD
2008/11/26
In the present study, the authors used a dynamic shearing and densitometric method for the asses- sment of susceptibility of stems of winter rape, vars Mar, Bolko, Leo, Ceres and Libravo to shearin...
Influence of application of plant growth regulators and desiccants on a yield and quality of winter oilseed rape
oilseed rape varieties plant growth regulators yield quality
2008/11/24
The purpose of the conducted researches was an estimation of influencing of application of growth regulators (metconazole, di-1-P-menten, dimethipin) and desiccants (diquat, glyphosate) on a yield and...
Development of studies on the mechanical properties of winter rape stems
rigidity maximum bending stress static shearing energy dynamic shearing energy
2008/11/21
In the study the author used a mechanical and an X-ray method for the determination of the strength properties of the stems of winter rape varieties. In a bending process, rigidity and maximum bending...
Temporal variation of the winter rape crop spectral characteristics
crop growth winter rape field spectroscopy vegetation indices remote sensing
2008/11/12
Application of remote sensing techniques in agriculture can be succesfull only if it is based on the knowledge of spectral-temporal properties of different crops and bare soils. The main goal of this ...
The effect of sowing density on the lodging and mechanical properties of rape stalks
rigidity dynamic shearing energy stem cross section area
2008/11/10
In this study, the mechanical properties of rape stalks are expressed by means of stalk rigidity determined in bending, and by means of dynamic shearing energy per unit of stalk cross section area. Ex...
Integrating parasitoids into management of pollen beetle on oilseed rape
Integrating parasitoids pollen beetle oilseed rape
2010/1/14
Integrating parasitoids into management of pollen beetle on oilseed rape.