A potential role of permanent soil variables and field topography to reveal scale dependence and the temporal persistence of soil water content spatial patterns

H. Bourennane; B. Nicoullaud; A. Couturier; B. Mary; G. Richard; D. King

A potential role of permanent soil variables and field topography to reveal scale dependence and the temporal persistence of soil water content spatial patterns

In: Precision Agriculture â05

Authors:

H. Bourennane

H. Bourennane ¹UnitÃ© de Science du Sol-INRA (OrlÃ©ans), BP 20619 Olivet 45160 Cedex, France
Hocine.Bourennane@orleans.inra.fr

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B. Nicoullaud

B. Nicoullaud ¹UnitÃ© de Science du Sol-INRA (OrlÃ©ans), BP 20619 Olivet 45160 Cedex, France

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A. Couturier

A. Couturier ¹UnitÃ© de Science du Sol-INRA (OrlÃ©ans), BP 20619 Olivet 45160 Cedex, France

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B. Mary

B. Mary ²UnitÃ© dâAgronomie-INRA, Rue F. Christ 02004 Laon Cedex, France

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G. Richard

G. Richard ¹UnitÃ© de Science du Sol-INRA (OrlÃ©ans), BP 20619 Olivet 45160 Cedex, France

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, and

D. King

D. King ¹UnitÃ© de Science du Sol-INRA (OrlÃ©ans), BP 20619 Olivet 45160 Cedex, France

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Type:: Chapter

Pages:: 769â777

DOI:: https://doi.org/10.3920/978-90-8686-549-9_094

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A field study was conducted to model the spatial and temporal variability of soil water content (W) and to assess the potential role of selected permanent soil variables and topography to reveal scale dependence and the temporal persistence of W spatial patterns. The W was measured gravimetrically in the first 0.3-m of soil at 84 sites of a regular grid, and W measurements were repeated at the same locations 2-3 times a year, i.e., at sowing, tilling, and harvesting. Thus seven sets of W were collected between 2000 and 2003. The proportions of sand, silt and clay, pH, organic carbon, CaCO₃ and total nitrogen (permanent soil variables) were measured in the upper soil layer (0-0.3-m) from soil cores sampled at the start of the experiment. Furthermore, the slope (Î²) and topographic wetness index (TWI) were derived from a DEM. The temporal variance of W measured at different dates, according to the spatial scale, was assessed by the co-dispersion coefficient, and the mean standardized relative difference (Î´_ij) of W was used to assess the pattern of relatively dry or wet zones. Partial least square (PLS) regression analysis was used to assess interrelationships between Î´_ij and permanent soil variables, and Î² and TWI. The behaviour and the relationships among the selected permanent soil variables and topography attributes were summarized through the kriged map of the latent vector (LV), which captures most of the systematic variation. The Î´_ij map was compared to the LV kriged map and to the maps corresponding to the main permanent soil variables assessed by factorial kriging analysis (FKA) in which the response variable (Î´_ij) was ignored. Results show that the Î´_ij of W appeared to be an efficient tool to identify the wetter and drier zones. Furthermore, results also show that permanent soil variables allow zones to be detected across the study area where additional investigations are needed to elucidate the temporal variation of a dynamic soil variable such as W.

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Precision Agriculture â05

E-Book ISBN:: 9789086865499

Publisher:: Wageningen Academic

Print Publication Date:: 24 Oct 2005

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- Life Sciences
  - General
  - Agriculture & Environment

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A potential role of permanent soil variables and field topography to reveal scale dependence and the temporal persistence of soil water content spatial patterns

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