[ Objective] This study was to understend the optimized combination of planting density, duration of disclosing plastic film and nitrogen fertilization under no-tillage cultivation. [ Method] Quadratic polynomial regr...[ Objective] This study was to understend the optimized combination of planting density, duration of disclosing plastic film and nitrogen fertilization under no-tillage cultivation. [ Method] Quadratic polynomial regression and saturated D-optimal design were employed to investigate the effects of planting density, duration of disclosing plastic film and nitrogen fertilization on the dynamics growth of rapeseed under no-tillage cultivation.[ Result] Within the experimental range, the growth dynamics of no-tillage cultivated rapeseed assumed a rise-fall tend. For the effects to the growth dynamics of no-tillage cultivated rapeseed, nitrogen application amount was higher than planting density and duration of disclosing plastic film. The interaction effect between planting density and duration of disclosing plastic film was higher than that between nitrogen application amount and planting density, and between nitrogen application amount and duration of disclosing plastic film. [ Conclusion] The optimized combination of these factors for dynamic growth of rapeseed under no-tillage cultivation was determined to be： planting density of per hectare 154 925 individuals, duration of disclosing plastic film of 110 d, nitrogen application amount of 315 kg/hm^2.展开更多
The popularity of technology has allowed universities to make changes through their educational system in recent years. Some transitioned from face-to-face instruction to online instruction. The aim of this study is t...The popularity of technology has allowed universities to make changes through their educational system in recent years. Some transitioned from face-to-face instruction to online instruction. The aim of this study is to investigate the perceptions of both the instructors and the students as regards second language acquisition through online education at a rural university. The study was implemented in the context of teaching and learning English as a second language in an online education environment. The course material is based on The Net Languages Learning Platform, which is available at http：//ide.yok.gov.tr/, and the course level is general English pre-elementary. Both quantitative and qualitative methods were used in this study. For quantitative data collection, a questionnaire was employed to understand the reasons for low student attendance on online courses. For qualitative research method, observation was carried out, and interviews are designed as data collection techniques. Purposive selection was used for selection of the participants. The findings revealed that online education needs to be modified. The students are eager to improve their second language competencies; however, they do not want to waste their time on an easy course level.展开更多
The paper has compared the quality of compulsory education of rural schools in West China with the counties,cities,and provincial capitals,and find out that there is a big gap between the quality of West rural and urb...The paper has compared the quality of compulsory education of rural schools in West China with the counties,cities,and provincial capitals,and find out that there is a big gap between the quality of West rural and urban compulsory education,the quality of some grades of the rural primary schools has not achieved the basic requirement of the curriculum standards,the gap between the quality of junior high schools in rural and urban areas is relatively severe.The mean score and qualified rate in the subjects of Chinese,mathematics and English of West rural junior high students are distinctly lower than that of the urban and county schools.The main factor that leads to the bigger discrepancy between the urban and rural education quality mainly lies in the difference in the teaching force.Compared with urban schools,the teachers in rural schools is insufficient and poorly-trained,with less access to teachers'professional development and support.The teaching quality in the West rural schools should be paid attention and improved in light of the rationale of educational equity.展开更多
基金Supported by Key Agricultural R&D Program in Guizhou Province dur-ing the Eleventh Five-year Plan[NZ(2005)3001]~~
文摘[ Objective] This study was to understend the optimized combination of planting density, duration of disclosing plastic film and nitrogen fertilization under no-tillage cultivation. [ Method] Quadratic polynomial regression and saturated D-optimal design were employed to investigate the effects of planting density, duration of disclosing plastic film and nitrogen fertilization on the dynamics growth of rapeseed under no-tillage cultivation.[ Result] Within the experimental range, the growth dynamics of no-tillage cultivated rapeseed assumed a rise-fall tend. For the effects to the growth dynamics of no-tillage cultivated rapeseed, nitrogen application amount was higher than planting density and duration of disclosing plastic film. The interaction effect between planting density and duration of disclosing plastic film was higher than that between nitrogen application amount and planting density, and between nitrogen application amount and duration of disclosing plastic film. [ Conclusion] The optimized combination of these factors for dynamic growth of rapeseed under no-tillage cultivation was determined to be： planting density of per hectare 154 925 individuals, duration of disclosing plastic film of 110 d, nitrogen application amount of 315 kg/hm^2.
文摘The popularity of technology has allowed universities to make changes through their educational system in recent years. Some transitioned from face-to-face instruction to online instruction. The aim of this study is to investigate the perceptions of both the instructors and the students as regards second language acquisition through online education at a rural university. The study was implemented in the context of teaching and learning English as a second language in an online education environment. The course material is based on The Net Languages Learning Platform, which is available at http：//ide.yok.gov.tr/, and the course level is general English pre-elementary. Both quantitative and qualitative methods were used in this study. For quantitative data collection, a questionnaire was employed to understand the reasons for low student attendance on online courses. For qualitative research method, observation was carried out, and interviews are designed as data collection techniques. Purposive selection was used for selection of the participants. The findings revealed that online education needs to be modified. The students are eager to improve their second language competencies; however, they do not want to waste their time on an easy course level.
基金the Ministry of Education of P.R.C.for the financial assistance to the study.
文摘The paper has compared the quality of compulsory education of rural schools in West China with the counties,cities,and provincial capitals,and find out that there is a big gap between the quality of West rural and urban compulsory education,the quality of some grades of the rural primary schools has not achieved the basic requirement of the curriculum standards,the gap between the quality of junior high schools in rural and urban areas is relatively severe.The mean score and qualified rate in the subjects of Chinese,mathematics and English of West rural junior high students are distinctly lower than that of the urban and county schools.The main factor that leads to the bigger discrepancy between the urban and rural education quality mainly lies in the difference in the teaching force.Compared with urban schools,the teachers in rural schools is insufficient and poorly-trained,with less access to teachers'professional development and support.The teaching quality in the West rural schools should be paid attention and improved in light of the rationale of educational equity.
