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The National Agricultural Library is one of four national libraries of the United States, with locations in Beltsville, Maryland and Washington, D.C. It houses one of the world's largest and most accessible agricultural information collections and serves as the nexus for a national network of state land-grant and U.S. Department of Agriculture field libraries. In fiscal year 2011 (Oct 2010 through Sept 2011) NAL delivered more than 100 million direct customer service transactions.

فعّال (مزود البيانات قام بتقديم البيانات الوصفية السنة الماضية)
Journal Article

مقال مجلة

Changes in soil properties following conversion of Acacia senegal plantation to other land management systems in North Kordofan State, Sudan  [2009]

El Tahir, B.A.; Ahmed, D.M.; Ardö, J.; Gaafar, A.M.; et al.

استعراض النص الكامل

Changes in soil texture, bulk density, pH, concentrations and stocks of OC, N, P and K before and after conversion of a 6-year-old Acacia senegal plantation to other land management systems (LMS) were investigated, after three cropping seasons, in the drylands of western Sudan. LMS included pure and intercropped sorghum (PS), roselle (PR) and grasses (PG) with A. senegal at high- and low-tree densities (HD 433 and LD 266 trees ha-1). Significant changes included increase in coarse sand and a decrease in fine sand under pure and intercropped systems at LD; decrease in clay contents in PS and PR; an increase in clay ratio in all pure crops and HD + R; a decrease in aggregated mean concentrations of OC, N and P under all LMS by 42%, 68% and 45%, respectively; increase in soil pH under all LMS; a depletion of aggregated mean stocks of OC, N, P and K in all LMS by 38%, 30%, 52% 13%, respectively. The study established that wholesale tree clearance constitutes a major cause of soil degradation, and tree inputs and cycling of nutrients are of major importance to soil fertility in the study area.
المجلة
Journal of arid environments
الرقم التسلسلي المعياري الدولي (ردمد) : 0140-1963

معلومات ببليوغرافية

اللغة:
English
النوع:
Journal Article
في أجريس منذ:
2013
المجلد:
73 issue 4-5
صفحة البداية:
499
صفحة النهاية:
505
جميع العناوين:
"Changes in soil properties following conversion of Acacia senegal plantation to other land management systems in North Kordofan State, Sudan"@eng
مسائل أخرى:
"Includes references"
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معلومات ببليوغرافية

اللغة:
English
النوع:
Journal Article
في أجريس منذ:
2013
المجلد:
73 issue 4-5
صفحة البداية:
499
صفحة النهاية:
505
جميع العناوين:
"Changes in soil properties following conversion of Acacia senegal plantation to other land management systems in North Kordofan State, Sudan"@eng
مسائل أخرى:
"Includes references"