VARIATION 



35 1 



Below is given a list of some correlations which have been observed in 

 wheat. The extent of the correlation varies more or less with the race 

 and variety of wheat and the external conditions of growth : 



Subject Character. 



Co-ordinated or Relative 

 Character. 



Positive or Negative 

 Correlation. 



Length of straw 



Number of straws 



Diameter of straw . 



7 

 



Length of the ear . 





 Length of growing period 



> 

 > 

 

 

 Weight of the grain 







Brittleness of rachis 

 Long upper internode . 



Length of ear 



Weight of ear 



Weight of grain in ear 



No. of grains per ear 



Grain yield per plant 



Grain yield per ear 



Density of ear 



Total weight of plant 



Length of straw 



Weight of straw 



Length of ear 



Density of ear 



Weight of grain per plant 



No. of grains per ear 



Resistance to frost 



Late ripening 



Length of upper internode 



Length of lower internode 



Tillering power 



Number of spikelets 



Density of the ear 



Total yield of plant 



Total weight of grain per plant 



Average size of the grain 



Starch content of grain 



Relative nitrogen content 



Size of the grain 



Nitrogen content 



Close-fitting glumes 



Heavy ear 



