Table 6 . --Simple aorretation ooeffiaients (r) between herbage 

 production and selected weather measurements 



Independent 







Product ion 





variable 







Graminoids 



: Forbs : 



Total 

 herbage 



Xi 

 X2 



Soil moisture at beginning of growth: 

 Weighted average for soil mantle 

 at 50-cm. depth 



-0.13 

 -.12 



-0.06 

 -.20 



-0.10 

 -.20 



X3 

 X4 



Precipitation : 



May 



May through July 



.54* 

 .22 



.65** 

 .38 



. 70** 

 .41 



X5 



Solar radiation: 

 June 



-.16 



-.21 



-.23 



Xe 



Maximum 

 June 

 July 



air temperatures (°F.): 



-.03 

 -.15 



-.36 

 -.24 



-.27 

 -.25 



Xs 



Xg 



Maximum 

 June 

 July 



air temperatures (degree-hours) 



-.21 

 -.31 



-.06 

 -.28 



-.15 

 -.34 



Xio 



Minimum 

 June 



air temperatures (°F.): 



.10 



-.09 



-.01 



Xil 



Minimum 

 June 



air temperatures (degree-hours) 



.14 



.54* 



.48* 



Xl 3 



Maximum 

 June 

 July 



temperatures of shaded soil (°F 



): 



-.38* 



-.62** 



-.61** 



- . / 



Xiu 



Maximum temperatures of shaded soil 

 (degree-hours) : 

 June 



.02 



-.23 



-.16 



Xl5 

 X16 



Wind velocity: 

 June 

 July 



.04 

 -.20 



-.26 

 -.19 



-.18 

 -.24 



*Signif icant 

 **Highly significant 



17 



