Pedosphere 19(3): 312--322, 2009
ISSN 1002-0160/CN 32-1315/P
©2009 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Evaluation of soil quality indicators in sugarcane management in sandy loam soil |
S. A. C. SANT'ANNA1,2, M. F. FERNANDES1 , W. M. P. M. IVO1 and J. L. S. COSTA3 |
1 Brazilian Agricultural Research Corporation (Embrapa Coastal Tablelands), Av. Beira Mar, 3250, Aracaju, SE, 49025-040 (Brazil)
2 Departament of Physiology, Universidade Federal de Sergipe, São Cristóvão, SE 49100-000 (Brazil)
3 Brazilian Agricultural Research Corporation (Embrapa) Brasília, DF 70770-901 (Brazil) |
| ABSTRACT |
| An important factor for the sustainability of soils highly susceptible to degradation is the use of monitoring tools that promptly and realistically reflect changes imposed on soil by different cropping systems. To select soil quality indicator variables in sugarcane (Saccharum officinarum L.) production areas that fulfill the criteria of sensitivity to management practices and between-season consistency in the management discrimination, ten composite soil samples (0-10 cm) were collected in July 2005 (rainy season) and again in March 2006 (dry season) from areas under cultivation of organic sugarcane (OS), green sugarcane (GS), burned sugarcane (BS) and from an adjacent native forest (NF) area at Usina Triunfo, Boca da Mata, Alagoas, Brazil. Microbial biomass-C (MBC), total organic C (TOC), soil enzyme activity expressed as the rate of fluorescein diacetate (FDA) hydrolysis, mean weight diameter of water-stable soil aggregates (MWD), and percentage of water-stable macroaggregates (PWSA) were analyzed. Although MBC and TOC were higher in NF than in the cultivated areas, no differences were observed in these C pools between the three sugarcane systems. The response of FDA to the site management was dependent on the sampling time. In the rainy period, the activity followed the order: NF > OS > GS > BS, whereas in the dry season, only NF differed from the other treatments. Irrespective of the sampling time, MWD and PWSA decreased in the order NF > OS = GS > BS. The variables MWD and PWSA are quite sensitive for discriminating between site management histories regardless the sampling season. |
| Key Words: fluorescein diacetate, green-sugarcane, organic matter management, sugarcane (Saccharum officinarum L.), sustainable agricultural use |
| Citation: Sant'anna, A. C., Fernandes, M. F., Ivo, P. M. and Costa, L. S. 2009. Evaluation of soil quality indicators in sugarcane management in sandy loam soil. Pedosphere. 19(3): 312-322. |
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