Table 27. Variables Used in Model Building and Their Simple 



Correlations with Dependent Variables Height and Yield 



Variables 



Simple Correlation 

 Coefficient (r) 



Salinity of the Soil Solution (o/oo) 



Nutrient Content of the Plant Tissue 



*0.01 r > | . 30 | 

 tO. 05 r > I 0. 39 I 



Height 



Soil Properties (Sampled 17 to 23 June 1970) 



Organic matter 



S-OM 



0.07 



0.04 



Cation exchange capacity 



S-CEC 



0.09 



0.15 



(meq/100 g) 









Soluble salts (MMho) 



S-SALT 



-0.07 



0.22 



Phosphorus (ppm) 



S-P 



0.06 



-0.09 



Potassium (ppm) 



S-K 



-0.02 



0.38* 



Calcium (ppm) 



S-Ca 



-0.03 



-0.17 



Magnesium 



S-Mg 



-.04 



0.22 



Manganese (ppm) 



S-Mn 



-0.19 



-0.08 



Sodium 



S-Na 



0.09 



0.29 



Sand (%) 



SAND 



0.14 



-0.36* 



Silt (%) 



SILT 



-0.15 



0.37* 



Clay (%) 



CLAY 



-0.12 



0.31* 



17 to 23 June 





AS -SAL 



-0.49t 



-0.05 



5 to 17 August 





BS-SAL 



-0.23 



0.01 



30 September to 2 October 



CS-SAL 



-0.39+ 



0.00 



17 to 23 June 









Nitrogen (%) 



AN 



0.14 



0.04 



Phosphorus (%) 



AP 



0.09 



0.39t 



Potassium (%) 



AK 



0.08 



-0.08 



Sodium (%) 



ANa 



0.16 



0.52 + 



Calcium (%) 



ACa 



-0.23 



-0.25 



Magnesium (%) 



AMg 



-0.23 



0.03 



Sulfur (%) 



AS 



-0.14 



-0.52+ 



Iron (ppm) 



AFe 



-0.11 



0.43 + 



Zinc (ppm) 



AZn 



0.25 



0.30* 



Manganese (ppm) 



AMn 



-0.24 



0.32* 



Copper (ppm) 



ACu 



0.05 



0.15 



108 



