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Short-Range Spatial Variability of Nitrogen Fixation by Field-Grown Chickpea

^a Dep. of Soil Science, Univ. of Saskatchewan, Saskatoon, SK, S7N 0W0 Canada
^b Dep. of Agronomy and Range Science, Univ. of California-Davis, Davis, CA 95616

View larger version (26K): [in a new window]   Fig. 1. Variability of the percentage N derived from the atmosphere (%Ndfa) in chickpea, 15N in chickpea and wheat, together with selected soil properties as observed along a transect (n = 110). The distances between observations is 0.3 m.

View larger version (8K): [in a new window]   Fig. 2. Experimental and modeled variograms of 15N in (a) wheat, (b) chickpea, and (c) percentage N derived from the atmosphere (%Ndfa).

View larger version (101K): [in a new window]   Fig. 3. Unconditional simulated stochastic field for percentage N derived from the atmosphere (%Ndfa) in chickpea. The field accurately reproduces the modeled variogram, and therefore reflects actual spatial variability of biological N fixation in the field.

View larger version (15K): [in a new window]   Fig. 4. Relationship between percentage N derived from the atmosphere (%Ndfa) in chickpea that are (a) 1 m and (b) 2 m apart, as resampled from the simulated stochastic fields.