io8 FARM AND SCHOOL PROBLEMS. 



In reading the test and making the selection of ears the fol- 

 lowing facts should be carefully observed : 



1. That a kernel is weak which makes a feeble growth when compared 

 with other kernels from the same ear. 



2. Kernels with large germs make more rapid growth than those with 

 smaller germs. 



The important points determined by experiments carried out 

 at some of the stations are : 



1. When ears test 5 strong and 1 weak kernel, the stand of corn will be 

 less than 95 per cent. 



2. When ears test 5 strong and 1 dead kernel the stand will be less than 

 90 per cent. 



3. Six weak kernels of uniform vitality will produce next highest in 

 yield to six strong kernels. 



The following table is compiled from an Iowa experiment 

 giving the average for three tests : 



NOTE. The figures in the first column under "germination" indicate 

 strong kernels. Those in the second column indicate weak kernels. The 

 third column would represent dead kernels if ears with dead kernels were 

 tested. No ears with dead kernels were used. 



PROBLEMS. 



1. Where the test above shows 5 strong and 1 weak kernel, what 

 was the decrease per cent below the stand made by 6 strong kernels. 



2. In yield of bushels per acre what was the decrease per cent, in 

 ears testing 6 weak below ears testing 6 strong? 



3. In an experiment made by an experiment station it was found 

 that in using ears testing 5 strong and 1 dead kernel the loss was 10.8 

 per cent, or 6.2 bushels below the production of ears testing 6 strong. 

 What was the yield per acre with 6 strong kernels? 



5. In another experiment or germination test it was shown that an 

 ear with 5 strong kernels and 1 weak kernel in comparison with an ear 



