Analysis of the spatial variability of crop yield and soil properties in small agricultural plots
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Analysis of the spatial variability of crop yield and soil properties in small agricultural plotsAlternative Title(s)
Análise da variabilidade espacial do rendimento de culturas e de propriedades do solo em pequenas parcelas agrícolasDate
2003Citation
Bragantia, 2003, vol. 62, nº. 1, p.127-138
Abstract
[Abstract] The objective of this study was to assess spatial variability of soil properties and crop yield under no tillage as a function of time, in two soil/climate conditions in São Paulo State, Brazil. The two sites
measured approximately one hectare each and were cultivated with crop sequences which included corn,
soybean, cotton, oats, black oats, wheat, rye, rice and green manure. Soil fertility, soil physical properties
and crop yield were measured in a 10-m grid. The soils were a Dusky Red Latossol (Oxisol) and a Red
Yellow Latossol (Ultisol). Soil sampling was performed in each field every two years after harvesting
of the summer crop. Crop yield was measured at the end of each crop cycle, in 2 x 2.5 m sub plots. Data
were analysed using semivariogram analysis and kriging interpolation for contour map generation. Yield
maps were constructed in order to visually compare the variability of yields, the variability of the yield
components and related soil properties. The results show that the factors affecting the variability of
crop yield varies from one crop to another. The changes in yield from one year to another suggest that
the causes of variability may change with time. The changes with time for the cross semivariogram
between phosphorus in leaves and soybean yield is another evidence of this result.
Keywords
Spatial variability
Kriging
Yield map
Semivariogram
Kriging
Yield map
Semivariogram
Editor version
ISSN
0006-8705