526 FORAGE PLANTS AND THEIR CULTURE 



640. Life period. The length of time required by the 

 soybean plant from germination to maturity varies 

 greatly with the variety and with the time of planting. 

 Early plantings require a much longer time to mature than 

 late plantings, but the same varieties do not behave 

 consistently in this respect. With a single variety, Haber- 

 landt found that the life period at Vienna, Austria, varied 

 from 182 days when planted March 31 to 139 days if 

 planted June 9, there being almost a perfectly regular 

 gradation for intermediate planting. 



Extensive experiments of this kind have been conducted 

 by Mooers at the Tennessee Experiment Station. Some 

 of his results are shown in the table : 



TABLE SHOWING RELATIONS BETWEEN DATE OF PLANTING AND 

 LIFE PERIOD IN SOYBEAN 



