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SOIL SAMPLING INTENSITY AND SPATIAL DISTRIBUTION PATTERN OF SOILS ATTRIBUTES AND CORN YIELD IN NO-TILLAGE SYSTEM

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Autor(es):
Rodrigues, Marcos S. [1] ; Cora, Jose E. [2] ; Fernandes, Carolina [2]
Número total de Autores: 3
Afiliação do(s) autor(es):
[1] FCAV UNESP, Jaboticabal, SP - Brazil
[2] FCAV UNESP, Dept Solos, Sao Paulo, SP - Brazil
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: ENGENHARIA AGRICOLA; v. 32, n. 5, p. 851-864, SEP-OCT 2012.
Citações Web of Science: 0
Resumo

Taking into account that the sampling intensity of soil attributes is a determining factor for applying of concepts of precision agriculture, this study aims to determine the spatial distribution pattern of soil attributes and corn yield at four soil sampling intensities and verify how sampling intensity affects cause-effect relationship between soil attributes and corn yield. A 100-referenced point sample grid was imposed on the experimental site. Thus, each sampling cell encompassed an area of 45 m(2) and was composed of five 10-m long crop rows, where referenced points were considered the center of the cell. Samples were taken from at 0 to 0.1 m and 0.1 to 0.2 m depths. Soil chemical attributes and clay content were evaluated. Sampling intensities were established by initial 100-point sampling, resulting data sets of 100; 75; 50 and 25 points. The data were submitted to descriptive statistical and geostatistics analyses. The best sampling intensity to know the spatial distribution pattern was dependent on the soil attribute being studied. The attributes P and K+ content showed higher spatial variability; while the clay content, Ca2+, Mg2+ and base saturation values (V) showed lesser spatial variability. The spatial distribution pattern of clay content and V at the 100-point sampling were the ones which best explained 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