Organic matter and phosphorus fractions in irrigated agroecosystems in a semi-arid region of Northeastern Brazil

Organic matter and phosphorus fractions in irrigated agroecosystems in a semi-arid region of Northeastern Brazil

The main goal of agricultural management practices in irrigated agroecosystems in the Brazilian semi-arid is either to maintain or increase soil quality. In these areas, the reduction in soil quality is mainly associated with depletion of soil organic matter (SOM), as well as of soil phosphorus (P)...

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Bibliographic Details
Published in:Agriculture, ecosystems & environment Vol. 138; no. 1; pp. 74 - 82
Main Authors: de Assis, Cristiane Pereira, de Oliveira, Teógenes Senna, da Nóbrega Dantas, Joana d’Arc, de Sá Mendonça, Eduardo
Format: Journal Article
Language:English
Published: Oxford Elsevier B.V 15-06-2010
Amsterdam; New York: Elsevier
Elsevier
Subjects:
Agricultural and forest climatology and meteorology. Irrigation. Drainage
agroecosystems
Agronomy. Soil science and plant productions
annuals
Apodi
bananas
Biological and medical sciences
Carbon
corn
Cultivation
Eutrophication
fruit crops
Fundamental and applied biological sciences. Psychology
General agroecology
General agroecology. Agricultural and farming systems. Agricultural development. Rural area planning. Landscaping
General agronomy. Plant production
Generalities. Agricultural and farming systems. Agricultural development
grain crops
Hard surfacing
humic substances
Irrigated cultivation
irrigated farming
Irrigation. Drainage
land management
land use
Musa
nitrogen
perennials
Phosphorus
Reduction
Reserves
semiarid zones
Soil (material)
soil depth
soil fertility
Soil management
soil organic carbon
Soil organic matter
Soil phosphorus
soil quality
Vegetation
Zea mays
Brazil
South America
America
Brazil, Ceara
Soil organic matter
Soil phosphorus
Irrigated cultivation
Soil management
Irrigation
Soils
Organic matter
Semi arid zone
Phosphorus
Ecology
Culture
Agroecosystem
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Summary:The main goal of agricultural management practices in irrigated agroecosystems in the Brazilian semi-arid is either to maintain or increase soil quality. In these areas, the reduction in soil quality is mainly associated with depletion of soil organic matter (SOM), as well as of soil phosphorus (P) reserves. We aimed to evaluate changes in SOM and P fractions of a eutrophic haplic cambisol (Eutric Cambisol) under different uses and management systems in the irrigated perimeter of Jaguaribe/Apodi in Ceará State, Brazil. The evaluated irrigated agroecosystems were perennial banana ( Musa ssp.) cultivation (IPBC) and annual maize ( Zea mays L.) cultivation (IAMC). The respective natural vegetation (NVIB) and (NVIM) were selected and used as a reference. Soil samples were collected at 0–5, 5–15, 15–25, and 25–40 cm soil depths, and evaluated for total organic carbon (TOC), total nitrogen (TN), humic substances, fractions of oxidizible organic carbon, and organic and inorganic P fractions. The stocks of TOC, TN, and humic substances in topsoil have been reduced by cultivation, and the largest reductions were observed in the IAMC area. The degree of SOM oxidation decreased with soil depth and the greastest amounts of labile C were found in IAMC. Annual and perennial agroecosystems showed changes in reserves of soil P. Our results pointed out that irrigated agroecosystems in the Brazilian semi-arid regions need to adopt management practices that favor the building up of soil SOM contents, particularly where annual crops are cultivated.
Bibliography:http://dx.doi.org/10.1016/j.agee.2010.04.002
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0167-8809
1873-2305
DOI:10.1016/j.agee.2010.04.002