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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)


Texto completo
Rodrigues, Marcos Sales [1] ; Cora, Jose Eduardo [1] ; Fernandes, Carolina [1]
Número total de Autores: 3
Afiliação do(s) autor(es):
[1] Sao Paulo State Univ UNESP, Dept Soil Sci, BR-14884900 Jaboticabal, SP - Brazil
Número total de Afiliações: 1
Tipo de documento: Artigo Científico
Fonte: Revista Brasileira de Ciência do Solo; v. 36, n. 2, p. 599-609, MAR-APR 2012.
Citações Web of Science: 12

Soil properties play an important role in spatial variability of crop yield. However, a low spatial correlation has generally been observed between maps of crop yield and of soil properties. The objectives of the present investigation were to assess the spatial pattern variability of soil properties and of corn yield at the same sampling intensity, and evaluate its cause-and-effect relationships. The experimental site was structured in a grid of 100 referenced points, spaced at 10 m intervals along four parallel 250 m long rows spaced 4.5 m apart. Thus, points formed a rectangle containing four columns and 25 rows. Therefore, each sampling cell encompassed an area of 45 m(2) and consisted of five 10 m long crop rows, in which the referenced points represented the center. Samples were taken from the layers 0-0.1 m and 0.1-0.2 m. Soil physical and chemical properties were evaluated. Statistical analyses consisted of data description and geostatistics. The spatial dependence of corn yield and soil properties was confirmed. The hypothesis of this study was confirmed, i.e., when sampling the soil to determine the values of soil characteristics at similar to sampling intensity as for crop yield assessments, correlations between the spatial distribution of soil characteristics and crop yield were observed. The spatial distribution pattern of soil properties explained 65 % of the spatial distribution pattern of corn yield. The spatial distribution pattern of clay content and percentage of soil base saturation explained most of the spatial distribution pattern of corn yield. (AU)

Processo FAPESP: 08/52559-3 - Variabilidade espacial e relacoes entre atributos do solo e produtividade do milho.
Beneficiário:Marcos Sales Rodrigues
Linha de fomento: Bolsas no Brasil - Mestrado