Covariance Structures in Conventional and Organic Cropping Systems
المؤلف
المصدر
International Journal of Agronomy
العدد
المجلد 2013، العدد 2013 (31 ديسمبر/كانون الأول 2013)، ص ص. 1-8، 8ص.
الناشر
Hindawi Publishing Corporation
تاريخ النشر
2013-12-31
دولة النشر
مصر
عدد الصفحات
8
التخصصات الرئيسية
الملخص EN
Guidelines are needed to develop proper statistical analyses procedures and select appropriate models of covariance structures in response to expected temporal variation in long-term experiments.
Cumulative yield, its temporal variance, and coefficient of variation were used in estimating and describing covariance structures in conventional and organic cropping systems of a long-term field experiment in a randomized complete block design.
An 8-year database on 16 treatments (conventional and organic cropping systems, crop rotations, and tillage) was subjected to geostatistical, covariance structure, variance components, and repeated measures multivariate analyses using six covariance models under restricted maximum likelihood.
Differential buildup of the cumulative effects due to crop rotations being repeated over time was demonstrated by decreasing structured and unstructured variances and increasing range estimates in the geostatistical analyses.
The magnitude and direction of relationships between cumulative yield and its temporal variance, and coefficient of variation shaped the covariance structures of both cropping systems, crop rotations, and phases within crop rotations and resulted in significant deviations of organic management practices from their conventional counterparts.
The unstructured covariance model was the best to fit most factor-variable combinations; it was the most flexible, but most costly in terms of computation time and number of estimated parameters.
نمط استشهاد جمعية علماء النفس الأمريكية (APA)
Jaradat, Abdullah A.. 2013. Covariance Structures in Conventional and Organic Cropping Systems. International Journal of Agronomy،Vol. 2013, no. 2013, pp.1-8.
https://search.emarefa.net/detail/BIM-476121
نمط استشهاد الجمعية الأمريكية للغات الحديثة (MLA)
Jaradat, Abdullah A.. Covariance Structures in Conventional and Organic Cropping Systems. International Journal of Agronomy No. 2013 (2013), pp.1-8.
https://search.emarefa.net/detail/BIM-476121
نمط استشهاد الجمعية الطبية الأمريكية (AMA)
Jaradat, Abdullah A.. Covariance Structures in Conventional and Organic Cropping Systems. International Journal of Agronomy. 2013. Vol. 2013, no. 2013, pp.1-8.
https://search.emarefa.net/detail/BIM-476121
نوع البيانات
مقالات
لغة النص
الإنجليزية
الملاحظات
Includes bibliographical references
رقم السجل
BIM-476121
قاعدة معامل التأثير والاستشهادات المرجعية العربي "ارسيف Arcif"
أضخم قاعدة بيانات عربية للاستشهادات المرجعية للمجلات العلمية المحكمة الصادرة في العالم العربي
تقوم هذه الخدمة بالتحقق من التشابه أو الانتحال في الأبحاث والمقالات العلمية والأطروحات الجامعية والكتب والأبحاث باللغة العربية، وتحديد درجة التشابه أو أصالة الأعمال البحثية وحماية ملكيتها الفكرية. تعرف اكثر