62 GARDENING FOE THE SOUTH. 



Enough has been stated to show the necessity of a 

 change of crops, and the following are found the best 

 rules to observe in practice : 



1st. Crops of the same species, and even of the same 

 natural order, should not succeed each other. 



2d. Plants with perpendicular roots should succeed 

 those with spreading and superficial roots, and vice versa. 



3d. Crops which occupy the soil for several years, like 

 asparagus, rhubarb, etc., should be followed by those of 

 short duration. 



4th. Two crops alike favorable to the growth of weeds 

 should not occupy the soil in succession. 



5th. Crops abstracting largely from the soil the sul- 

 phates, phosphates, and nitrogenous principles, should not 

 follow each other immediately, but be succeeded by those 

 which draw less from the soil and more from the atmos- 

 phere. These exhausting crops, should follow and be fol- 

 lowed by those which bear and will profit by heavy ma- 

 nuring. 



6th. Plants grown for their roots or bulbs should not 

 follow those grown for the same purpose, and still less 

 should plants grown for their seeds follow each other di- 

 rectly in succession. 



The following are found in practice to be convenient 

 crops to succeed each other in rotation, beginning after an 

 application of manure, viz. : Onions, lettuce, cabbage, car 

 rots, manure ; or, turnips, celery, peas, potatoes, manure. 



The following is also a very good rotation : 



1. The cabbage tribe to be followed by 



2. Alliaceous plants, as onions, leeks, etc., to be follow- 

 ed by legumes, as beans or peas. Peas may be followed 

 the same year with celery. 



3. Tap-rooted plants, as carrots, beets, parsnips. 



4. Surface roots, as onions, potatoes, turnips. 



5. Celery, endive, lettuce, spinach, etc. 



Celery is excellent to precede asparagus, onions, cauli- 



