GRASSES, CLOVER, AND ALFALFA 



211 



were obtained by this method. Another method is sometimes 

 used in clonally propagated rows. Each row is surrounded by 

 a fence about 10 ft. high made of finely woven cloth. This 

 method does not prevent some cross-pollination but it does bring 

 about a high degree of inbreeding. A tall growing crop, such as 

 rye, surrounding isolated plots prevents pollination with un- 

 desirable strains or varieties. 



As would be expected in dealing with a heterozygous crop, 

 the self-fertilized seed of the various isolated clones produced 

 plants which showed considerable difference in their inheritance. 

 Some of the clones bred fairly true when reproduced by selfed 

 seed, others did not. Table L, taken from Webber et al (1912), 

 illustrates the transmission of yielding ability in some clones. 



TABLE L. TRANSMISSION OF YIELD IN TIMOTHY BY CLONAL AND SEED 



PROPAGATION 



LIGHT-YIELDING PLANTS 



HEAVY-YIELDING PLANT 



