118 



IMPROVING THE QUALITY OF WHEAT. 



Table 36. — Summary of relation of size of head to yield, height, and tillering of plant. 



Classification according to 

 number of kernels on 

 head. 



Below 16 



16 to 20 



20 to 24 



24 to 28 



28 to 32 



32 to 36 



More than 36 



Tillering. 



6.9 



13.7 

 21.4 

 21.2 

 19.4 

 15.4 

 10.2 



Table 37. — Relation of yield of plant to height and tillering, and to the yield per head. 



Classification according to yield per plant, in I Number 

 grams. of plants. 



Below 1 



1 to 2.5 



2,5 to 5 



5tol0 



10 to 15 



15 to 20 



More than 20 



31 

 67 

 87 

 93 

 51 

 20 

 5 



Yield per 



plant 

 (grams). 



0. 6050 



1.7673 



3. 5526 



7. 6485 



12. 2862 



17.1908 



23. 2829 



Height 



(cm.). 



Tillering. 



56.5 

 62.2 

 69.1 

 75.4 

 84.4 

 84.6 

 85.2 



3.7 

 7.0 

 11.6 

 22.1 

 32.3 

 42.9 

 43.2 



Yield per 



head 

 ■ (gram). 



0. 3553 

 .■4740 

 .4917 

 . 5320 

 . 5592 

 . 5310 

 .6865 



Table 38. — Relation of yield per head to yield, height, and tillering of plant, and to weight of 



average Tcernel. 



SUMMARY AND CONCLUSIONS. 



As between wheat kernels of the same variety raised under similar 

 conditions, those kernels having a high percentage of proteid mate- 

 rial have a lower specific gravity, weigh slightly less, and occupy a 

 smaller volume than kernels having a smaller percentage of proteids. 



As between individual spikes and individual plants, the same rela- 

 tions obtain. 



As between individual plants in different years, these relations do 

 not hold. 



The quahty of high proteid content and its correlated properties 

 may be due to immaturity in the kernel, or they may belong to the 

 normal and fully ripened kernel. 



As between kernels, spikes, and plants, those kernels of greater 

 weight contain a larger weight of proteids — this in spite of the fact 

 that they contain a lower percentage. 



