293 CITRUS FRUITS AND THEIR CULTURE. 



trees can be had, then the latter may be grown between 

 the tree rows. If a plant could be secured which would 

 make a good growth during the winter season and which 

 could readily be disposed of in spring, so as to permit 

 of frequent cultivation during the dry summer months, 

 it would be very desirable. Unfortunately, it is too dry, 

 early in autumn, to start a crop satisfactorily without 

 recourse to irrigation, and heavy applications of water 

 at this season are not best for the trees. The Canada 

 field pea, Bur clover and lupines have received the most 

 attention. Fortunately the more retentive nature of the 

 California soils and their greater store of fertility has 

 not as yet rendered the growing of a cover crop of so 

 much importance as it is in Florida. 



In some cases, however, the soils are becoming de- 

 pleted, and the day is not far distant, in fact has already 

 come in some instances, when the cover crop question 

 will be one of great moment to the growers on the Pa- 

 cific coast. Clean culture cannot produce good results 

 indefinitely and the sooner cover crops are given attention, 

 the better for the future of the citrus industry. 



