Fertilizing and W'.itt'i iiig I rees 



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STREET 



Figure 7. Sites for placing phosphorus and potassium fertilizers in the soil should 

 be uniformly spaced in parallel lines throughout the area to be fertilized. If dry 

 fertilizer is to be placed in holes, the holes should be at 2-foot intervals. If liquid 

 fertilizer is to be injected, sites should be 2 V2 feet apart. 



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Fu;i RK 8. A soil needle that is fed by a hydraulic pump may be used to inject 

 water-soluble fertilizers into the soil. It may also be attached to a hose and used 

 to water trees. 



