Título:	Variability of soil fertility properties in areas planted to sugarcane in the state of Goias, Brazil.
Autor:	CARDOSO, J. A. LACERDA, M. P. C. REIN, T. A. SANTOS JUNIOR, J. de D. G. dos FIGUEIREDO, C. C. de
Afiliación:	JOSÉ AVELINO CARDOSO, UNIVERSIDADE DE BRASÍLIA; MARILUSA PINTO COELHO LACERDA, UNIVERSIDADE DE BRASÍLIA; THOMAZ ADOLPHO REIN, CPAC; JOAO DE DEUS GOMES DOS SANTOS JR, CPAC; CÍCERO CÉLIO DE FIGUEIREDO, UNIVERSIDADE DE BRASÍLIA.
Año:	2014
Referencia:	Revista Brasileira de Ciências do Solo, v. 38, p. 506-515, 2014.
Descripción:	Soil sampling should provide an accurate representation of a given area so that recommendations for amendments of soil acidity, fertilization and soil conservation may be drafted to increase yield and improve the use of inputs. The aim of this study was to evaluate the variability of soil fertility properties of Oxisols in areas planted to sugarcane in the State of Goias, Brazil. Two areas of approximately 8,100 m² each were selected, representing two fields of the Goiasa sugarcane mill in Goiatuba. The sugarcane crop had a row spacing of 1.5 m and subsamples were taken from 49 points in the row and 49 between the row with a Dutch auger at depths of 0.0-0.2 and 0.2-0.4 m, for a total of 196 subsamples for each area. The samples were individually subjected to chemical analyses of soil fertility (pH in CaCl2, potential acidity, organic matter, P, K, Ca and Mg) and particle size analysis. The number of subsamples required to compose a sample within the acceptable ranges of error of 5, 10, 20 and 40 % of each property were computed from the coefficients of variation and the Student t-value for 95 % confidence. The soil properties under analysis exhibited different variabilities: high (P and K), medium (potential acidity, Ca and Mg) and low (pH, organic matter and clay content). Most of the properties analyzed showed an error of less than 20 % for a group of 20 subsamples, except for P and K, which were capable of showing an error greater than 40 % around the mean. The extreme variability in phosphorus, particularly at the depth of 0.2-0.4 m, attributed to banded application of high rates of P fertilizers at planting, places limitations on assessment of its availability due to the high number of subsamples required for a composite sample.
NAL Thesaurus:	Soil fertility Sugarcane Saccharum Soil sampling Soil analysis Spatial distribution Oxisols
Tipo de Material:	Artigo de periódico
Acceso:	openAccess
Aparece en las colecciones:	Artigo em periódico indexado (CPAC)