FIELD AND LABORATORY STUDIES OF CROPS 



EXERCISE 1. HOW PLANTS GROW 



Equipment: Shallow tray, 2X6X8 inches; two panes 

 of glass about 5X8 inches; a spool of black thread; a 

 strip of muslin about 3 X 10 inches. 



Method: Sprout some corn kernels in a germinator or 



Fig, 1. — Arrangement of Tray and Glass Plates for the Study of Root 

 Growth. (U. S. Dept. of Agr.) 



between the folds of a wet cloth until the roots are about 

 two to three inches long. Lay one piece of glass in the tray, 

 letting one end rest on the bottom and the other on the 

 opposite edge of the tray as shown in Fig. 1. Wet the 

 strip of cloth and spread it on the pane of glass, allowing 



