10 LABORATORY MANUAL IN FIELD CROPS 



PRACTICUM NO. 7 . 

 Object. To Test the Result of Grading Corn Seed. 



Materials. Corn on the cob, access to a corn planter at a 

 near-by hardware store or on a farm. 



Method. Shell one ear with all the kernels. 



Shell another ear and grade the seeds to uniform size. 



Run both samples through the machine by propping the 

 machine off the floor and turning the wheels. 



Calculate the number of hills in one hundred (or the per- 

 centage of hills dropped) which contain either more or less than 

 the regulation number of kernels. 



STUDIES 



1. What effect would this grading have on your stand of 

 corn? 



2. How many more pounds of seed would be required to 

 plant an acre with the ungraded seed ? 



3. What would the grading per bushel be worth, i.e. how 

 much more could you afford to pay for graded seed, if you 

 consider only the amount of land one bushel will sow? 



