PREPARATIONS FOR PLANTING. 241 



plan has worked quite successfully. After three or four 

 years the pineapples will be removed entirely and the 

 whole space given up to the trees. 



Whenever this plan is adopted, one mistake must 

 be guarded against. The favorite pineapple fertilizers 

 used in Florida to-day contain organic sources of nitro- 

 gen. If these be used on a double planting of pineapples 

 and citrus trees, the latter will almost surely be affected 

 with die-back. A fertilizer containing sulphate of am- 

 monia and a little nitrate of soda as sources of nitrogen 

 is the only safe one to use. 



Peaches and citrus trees may be planted together. 

 The quincunx method may be used and after the peaches 

 have served their term of usefulness they can be removed. 

 Both kinds of trees succeed well when given the same 

 kind of cultivation and supplied with the same fertilizer, 

 viz., one containing no organic sources of nitrogen. 



Other double plantings may be made, but in general 

 it may be said that no tree or plant should be set with 

 citrus trees and allowed to occupy the ground to the detri- 

 ment of the latter. Vegetables are permissible in the 

 citrus grove only in regions not exposed to frost, and 

 when supplied with fertilizers congenial to the trees. In 

 frosty regions there is always a chance that the cultiva- 

 tion, fertilizing and watering of the soil, when planted in 

 vegetables, will cause the trees to grow during the winter 

 months. Generally, vegetables should be planted else- 

 where than in the citrus grove, for the trees succeed best 

 when given all the space. 



LEVELING AND SMOOTHING. 



Lands upon which citrus trees are to be planted are 

 frequently quite rough. If the ground is left in this con- 



