文章基本信息

标题：The Impact of Plot-Size on the Estimation of Wheat Yield in Sudan: The Case of New-Halfa Agricultural Scheme
本地全文：下载
作者：Al-Feel, Mohamed Ahmed ; Abdullah, Seram Kamal Mohamed ; Siddig, Khalid 等
期刊名称：Journal of Food Distribution Research
印刷版ISSN：0047-245X
出版年度：2013
卷号：SUPPL
出版社：Food Distribution Research Society
摘要：This study was carried out to evaluate the effects of different plots sizes on the estimation of wheat yield in New-Halfa scheme. We applied crop cutting method to estimate wheat yield and multi-stage stratified sampling method for the sampling. We use a farm survey data with different plot sizes, in the four villages within the Scheme, and for season 2009/2010. The analysis of variance (ANOVA), multiple comparison, standard deviations, standard errors, and coefficients of variation were used in analyze the results. Results showed no significant differences between large and medium size plots in yield estimation. However, there were significant differences between large and small plot sizes and between medium and small plot sizes with respect yield estimation. Higher crop yields were obtained in small compared to large and medium size plots in both strata. As plot size increases, the estimated yield and standard deviation of yield decreases in the two strata. The yield estimation attains a stable value when the plot size is significantly large and it is not recommended to estimate wheat yield with plot sizes less than 42 square meters.
关键词：Strata;plot;random sample;analysis of variance;standard error