268 



CAMPBELL'S SOIL CULTURE MANUAL 



measured largely by the stage of growth of the plant. If 

 at the beginning of the farming point the head in the ori- 

 ginal or parent stalk will be smaller; if at the kernel form- 

 ing period, the less kernel, etc. 



The point we wish to convey is the fact that coarse, 

 loose soils as shown in the cut at the left will not permit 



A. B. 



Gut No. 24. Growth and stooling of grain, (a) Growth in loose 



unpacked soil, (b) Growth and stooling of 



wheat in ideal soil conditions, 



of a perfect root system, and will not carry to exceed one- 

 fifth to one -tenth the amount of moisture (see cut No. 10); 

 also that moisture will not move by capillary attraction 

 more than one-fourth to one-eighth as fast in such soil 

 consequently crops under this most common condition in 

 the past, during a prolonged drouth, had to suffer severely 

 or perish entirely. 



THE SCIENTIFIC CONDITION. 



At the right end of cut No. 24 we have the ideal condi- 

 tion. As shown in cut No. 16 the lower portion of the fur- 



