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Spatial Variability of Nitrate in Irrigated Cotton: II. Soil Nitrate and Correlated Variables
Author(s) -
Tabor J. A.,
Warrick A. W.,
Myers D. E.,
Pennington D. A.
Publication year - 1985
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1985.03615995004900020024x
Subject(s) - geostatistics , nitrate , spatial variability , soil science , petiole (insect anatomy) , environmental science , soil water , silt , soil test , potassium , soil ph , hydrology (agriculture) , agronomy , chemistry , mathematics , geology , ecology , hymenoptera , paleontology , statistics , geotechnical engineering , organic chemistry , biology
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.