The Book of Wheat: An Economic History and Practical Manual of the Wheat IndustryO. Judd, 1908 - 369 páginas |
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Página 36
... varieties of wheat which had this quality in the highest de- gree had an advantage which aided them to survive other va- rieties . This , however , is only the operation of the prime factor of selection , or , as Darwin calls it , the ...
... varieties of wheat which had this quality in the highest de- gree had an advantage which aided them to survive other va- rieties . This , however , is only the operation of the prime factor of selection , or , as Darwin calls it , the ...
Página 40
... varieties of wheat side by side . Why varieties do not cross under these circumstances has not been fully explained . It is claimed that over half of the pollen from an anther is deposited into the air , and it would seem that it could ...
... varieties of wheat side by side . Why varieties do not cross under these circumstances has not been fully explained . It is claimed that over half of the pollen from an anther is deposited into the air , and it would seem that it could ...
Página 42
... varieties are arti- ficially crossed . " As to these varieties Hays says : " The further they have departed from ancestral characteristics and formed diverse qualities , the more likely will their progeny ex- hibit new characteristics ...
... varieties are arti- ficially crossed . " As to these varieties Hays says : " The further they have departed from ancestral characteristics and formed diverse qualities , the more likely will their progeny ex- hibit new characteristics ...
Página 43
... varieties , a fact which " certainly indicates blood relation- ships between the classes of wheats . " Since the qualities originated by hybridization must be de- veloped by selection , it may take years before the value of the hybrid ...
... varieties , a fact which " certainly indicates blood relation- ships between the classes of wheats . " Since the qualities originated by hybridization must be de- veloped by selection , it may take years before the value of the hybrid ...
Página 44
... varieties have received his name , some of which have be- come standard . Pringle's Defiance has been a rust resistant variety of California since 1878. During his connection with the Colorado agricultural college A. E. Blount produced ...
... varieties have received his name , some of which have be- come standard . Pringle's Defiance has been a rust resistant variety of California since 1878. During his connection with the Colorado agricultural college A. E. Blount produced ...
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