158 SYSTEMATIZED PLANT-BREEDING 



neglecting fractions, are 40 and 36 bushels of 63 

 Ibs. each per acre. The results can be explained 

 on the assumption that the hybrid has inherited 

 the yielding capacity of Square Head's Master 

 together with the disease-resisting property of 

 the Ghurka wheat, and consequently rust takes no 

 toll of the crop as it always does in varying amounts 

 of a crop of Square Head's Master. The preliminary 

 trials made it clear that the wheat was one which 

 was suitable in other respects, such as in the yield of 

 straw, its standing-capacity under bad conditions, 

 its time of ripening, and so on, and it was therefore 

 distributed on a small scale amongst farmers in 

 the Eastern counties. At the same time arrange- 

 ments were made to secure reports as to its yield 

 per acre under the diverse conditions it met with 

 away from the experimental farm. An analysis 

 of these results shows conclusively that the original 

 estimates made of its cropping capacity were fairly 

 correct, for the yields average from five to ten per 

 cent, per season more than Square Head's Master. 

 Fortunately, for this is a matter outside the 

 breeder's control at present, the variety has proved 

 adaptable for all types of soils on which wheat 

 can be grown, though perhaps it succeeds best on 

 the lighter and poorer soils. As a result it has 

 become thoroughly established, especially in the 

 Eastern counties where it forms the bulk of the 

 wheat now grown. Its cultivation has extended 

 steadily to other parts of the country, and now 



