EXERCISE 21. TO STUDY THE EFFECT OF STAND 

 UPON THE YIELD OF CORN 



Equipment: Basket; 50-foot tape line; a pair of spring 

 balances. 



Method : As soon as corn is ripe, go to a nearby field 

 and after selecting a representative row, measure off one- 

 hundredth of an acre * and count: (1) the total number of 

 stalks and (2) the number of stalks which have no ear. 

 Compare the total number of plants actually found with 

 the number necessary to constitute a perfect stand. Husk 

 and weigh the corn, count the number of ears and calculate 

 the average weight. Make the necessary calculations and 

 fill in the blanks in the accompanying form: 



Number of stalks necessary for perfect stand 



Number of plants found 



Per cent of perfect stand 



Total weight of corn harvested 



Number of ears harvested 



Average weight of ears 



Yield in bushels ])er acre 



Yield for a perfect stand with each stalk producing an 



average-sized ear 



Yield for a perfect stand if each stalk had produced a 

 f-lb. ear 



* If the rows are 3 J feet apart, 125 feet will make a hundredth part 

 of an acre. 



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