A greenhouse equipped for present-day photoperiod studies on economic plants at 

 the Bureau of Plant Industry Station, Beltsville, Md. The results of many studies here and 

 elsewhere have helped to eliminate crop failure and have modified agricultural practices 

 throughout the world. 



Recently crosses were made between a wild species of sugarcane 

 (Saccharum spontavevm) from Turkistan, which blooms in July, 

 with cultivated sugarcane (S. officinaL i, which blooms in November 

 or December, By appropriate manipulations of photoperiod for 

 each plant the times of flowering were synchronized so that crosses 

 could be made between them. Tin- blooming period of the hybrids 

 was found to be intermediate between those of the parents. The 

 illustration on the cover page shows a progeny from such a cross. 

 'The purpose of these hybridizations was to combine those factors 

 thai contributed cold hardiness to the wild species with the factors 

 for yield and quality present in the cultivated sugarcane. 



A lisi of plants which -avc photoperiodicaUy sensitive would include 

 most of tln»e o( economic importance crown in ihe United States 



1!' 



