THE CORRELATIONS OF AREAS OF MATURED CROP AND THE RAINFALL. 371 



The following tables show the mean value of the rainfall, its variation, and the 

 value of <A for the two Tahsils, Sialkot and Zafarwal (total unirrigated area): — 



Sialkot 



I. Kharif Harvest. 



C Rainfall April to August . . 



L ,, April to September 



r Rainfall April to August . . 

 Zafarwal \ 



( ,, April to September 



77. Rabi Harvest. 



R 



T R 







C Rainfall September to March 

 Sialkot ] 



( ,, October to March 



r Rainfall September to March 



Zafarwal 



I 



October to March 



2079 + I"22 



8-116+ -87 



•0112 



24*01 + 1*36 



8-979+ -96 



•0114 



22-94+1-31 



8713+ '93 



•0126 



25-80+1-45 



9-698+ 1*03 



•0117 





10-50+ -92 



6-09 + -65 



•0501 



7-30+ 63 



4*i8 + -45 



•0556 



10-43+1-05 



6-96 + 74 



•0470 



773+ -69 



4'57 ±'49 



•0647 



The regression equations giving the probable value of the crop in the two har- 

 vests from the known rainfall in the two periods, April to August (both inclusive), and 

 September to March (both inclusive) are: — 



(i) Total unirrigated area in Tahsil Sialkot. 

 (a) Kharif harvest. 



For the regression of crop on rain 

 C = 5647 #.+38676 

 For the regression of rain on crop 

 C =3262*1 #-17417 

 and E c = +1518. 



(p) Rabi harvest. 



For the regression of crop on rain 

 C = 2618-4 #-(-24722 

 For the regression of rain on crop 

 C =3818-6 # + 12119 

 and E c = +1623. 



(it) Total unirrigated area in Tahsil Zafarwal. 

 (a) Kharif harvest. 



For the regression of crop on rain 

 C = 5947 R+33569 

 For the regression of rain on crop 

 C =2336-5 R-6397 

 and £ c = +i355. 



