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Spatial Variability of Nitrate in Irrigated Cotton: II. Soil Nitrate and Correlated Variables¹

ABSTRACT

The relation between nine soil variables: soil nitrate, % sand, silt and clay, pH, electrical conductivity (EC_e), sodium, potassium, and phosphorus plus petiole nitrate were analyzed by geostatistics and cluster analysis. The samples were collected from 49 sites in a 360 by 360m plot in a commercial cotton (Gossypium hirsutum) field. An intensive soils map of the plot was compared to distributions of the soil variables. Models developed from variograms of highly correlated variables were tested using a "jack-knifing" technique and then the data was block kriged. Soil nitrates were highly correlated with EC_e, which has a similar spatial dependence and spatial structure. Percent clay and petiole nitrate were moderately well correlated and had similar spatial structure to each other.

¹ Ariz. Agric. Exp. Stn. Paper no. 473. Support was from Western Regional Project W-155.

² Graduate Assistant, Professor from Dep. of Soils, Water & Eng., Professor from Dep. of Mathematics, and Extension Specialist from Dept. of Soils, Water & Eng., respectively, Univ. of Arizona, Tucson, 85721.

Received for publication November 28, 1983. Accepted for publication July 20, 1984.

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