APPLICATION 107 



in the surface water. But nitrogen is very likely to escape and 

 should be applied after growth has started so that it may be 

 taken up quickly. 



The fertilizing of the various kinds of fruit trees will vary 

 somewhat, but there will probably not be any greater variation 

 than might occur between two different varieties of the same kind 

 of fruit or between two blocks of the same fruit on different 

 soils. For example, the Wagener and Gravenstein apples will 

 probably vary nearly as much in their fertilizer requirements 

 as will the general classes of apples and peaches. And two 

 blocks of Baldwin apple trees on very different soils may need 

 quite as different fertilizers as a block of peaches and a block 

 of apples. 



QUESTIONS 



1. Compare orchards with wheat in their exhaustion of soil fertility. 



2. Wiiat have experiments proved in regard to orchard fertilizers? 



3. Wiiat are the effects of nitrogenous fertilizers? 



4. Give the effects of fertilizers ricli in potash. 



5. What is the influence of phosphoric acid on fruit trees? 



6. Discuss the forms of fertilizer to be used in supplying nitrogen. 



7. From what sources may the phosphoric acid be derived? Which are 



best for young trees ? 



8. What two forms of potash are in common use? Give an advantage 



of each. 



9. Is orchard fertilizing practised in your section? 



