126 



BREEDING CROP PLANTS 



likewise studied, such as early maturity and high yield; short- 

 haired rachilla and high brewing qualities in barley; weight of 

 1,000 grains in wheat, oats, and barley and yield; stooling with 

 yield and quality; size of spike or panicle and yield. In some 

 cases there seemed to be a relation between yield or quality and 

 some particular character, but when sufficient numbers were 

 studied no consistent association between any one morphological 

 character and yield was found. 



Much investigational study has been made on this subject by 

 others and similar conclusions have been reached. At the Minne- 

 sota Station correlations between yield and the following char- 

 acters in wheat have been sought; stooling, height of plant, size of 

 seed, date heading, and date of maturity. In some seasons the 

 early varieties were the better yielders and in other seasons the 

 later varieties. 



Stooling was obtained from plots in which plants had room for 

 individual development, and the correlation of stooling and yield 

 was computed for two years for wheat, oats, and barley. Yield 

 was obtained from the replicated rod-row test. The results 

 showed no association between stooling and yielding ability. 



Quite consistent association between weight of 1,000 plump 

 seed and yield of wheat as determined by the rod-row test 

 was obtained as is here shown. 



TABLE XXVI. CORRELATIONS BETWEEN WEIGHT OF 1,000 PLUMP SEED 

 or T. vulgare AND YIELD 



Fairly consistent results of this nature would seem to show that 

 weight of seed was associated with high yield in wheat. Mont- 

 gomery (1912) isolated more than a thousand pure lines of 

 Turkey winter wheat at the Nebraska Station and found both 

 large- and small-seeded strains among the higher yielders. Simi- 

 lar results have been obtained at Svalof . 



A study of the correlation between lodging and morphological 



