Mechanized direct sowing of rapeseed is a labor-saving and highly-efficient culture technique. In order to explore high-yield cultivation techniques suitable for Chengdu Plain, effects of several key agronomic measure...Mechanized direct sowing of rapeseed is a labor-saving and highly-efficient culture technique. In order to explore high-yield cultivation techniques suitable for Chengdu Plain, effects of several key agronomic measures＇, such as sowing date, density and N fertilizers, on development and yield formation were studied by strip and split plot experiment of three factors. The research showed that optimal condi- tions for direct seeding technology can be achieved provided with scientific sowing date, density and appropriate N fertilizers, and the research showed that rapeseed yield reached the peak at 320 g/m2, when sowing date was on September 3th, sow- ing density was 30 plant/m2, and nitrogen fertilizer was 27 g/m2.展开更多
Nano alumina was synthesised using precursors from pre-heated kaolinitic clay at 600˚C, 700˚C, and 800˚C following by a bottom-up sol gel method that led to Al(OH)3. The latter was subsequently calcinated at 900˚C to ...Nano alumina was synthesised using precursors from pre-heated kaolinitic clay at 600˚C, 700˚C, and 800˚C following by a bottom-up sol gel method that led to Al(OH)3. The latter was subsequently calcinated at 900˚C to form γ-nano alumina (γ-Al2O3). The final products were characterised using X-ray Diffraction (XRD), Fourier transformed infrared Spectroscopy (FTIR), Scanning electron Microscopy (SEM) coupled with Energy dispersive X-ray analysis (EDX) as well as Brunauer-Emmett-Teller (BET) for specific surface area measurement. The γ-nano alumina confirmed by X-ray patterns and infrared spectroscopy was found to be in a poorly crystalized form with 6.8 nm as crystallite size. The specific surface area and the synthesis yield varied with the temperature of pre-heating kaolinitic clay. The best process yield, 17.88%, and specific surface area of 146.78 m2/g, was obtained with 700˚C as the best pre-heating temperature of the precursor. Due to the characteristics of the product obtained, they could be very interesting in many applications such as adsorption given their high specific area and nanoscale structure.展开更多
基金Supported by Special Fund for Agro-scientific Research in the Public Interest(200903050-4)National Public Science and Technology Research Funds Project(201303129)~~
文摘Mechanized direct sowing of rapeseed is a labor-saving and highly-efficient culture technique. In order to explore high-yield cultivation techniques suitable for Chengdu Plain, effects of several key agronomic measures＇, such as sowing date, density and N fertilizers, on development and yield formation were studied by strip and split plot experiment of three factors. The research showed that optimal condi- tions for direct seeding technology can be achieved provided with scientific sowing date, density and appropriate N fertilizers, and the research showed that rapeseed yield reached the peak at 320 g/m2, when sowing date was on September 3th, sow- ing density was 30 plant/m2, and nitrogen fertilizer was 27 g/m2.
文摘Nano alumina was synthesised using precursors from pre-heated kaolinitic clay at 600˚C, 700˚C, and 800˚C following by a bottom-up sol gel method that led to Al(OH)3. The latter was subsequently calcinated at 900˚C to form γ-nano alumina (γ-Al2O3). The final products were characterised using X-ray Diffraction (XRD), Fourier transformed infrared Spectroscopy (FTIR), Scanning electron Microscopy (SEM) coupled with Energy dispersive X-ray analysis (EDX) as well as Brunauer-Emmett-Teller (BET) for specific surface area measurement. The γ-nano alumina confirmed by X-ray patterns and infrared spectroscopy was found to be in a poorly crystalized form with 6.8 nm as crystallite size. The specific surface area and the synthesis yield varied with the temperature of pre-heating kaolinitic clay. The best process yield, 17.88%, and specific surface area of 146.78 m2/g, was obtained with 700˚C as the best pre-heating temperature of the precursor. Due to the characteristics of the product obtained, they could be very interesting in many applications such as adsorption given their high specific area and nanoscale structure.
