22 VEGETABLE GROWING. 



wheat on the same plot for twenty consecutive years, 

 and at the end of this time the land seemed fully as 

 good for wheat as it was at the beginning of the 

 experiment. 



It is always a good practice, however, to change the 

 crop grown in any field from year to year. In making 

 changes of crops, they should be as different as possi- 

 ble. It is well to plant a field that has just had a good 

 green soiling with some gross feeding crop, as the 

 small grains or corn, and then to follow this with vege- 

 tables. To follow a crop of egg-plant with a crop of 

 tomatoes could hardly have the force of rotation, in as 

 much as the plants use about the same fertilizer and 

 harbor the same insects ; cabbage following cauliflower 

 could not be considered a rotation for the same reason, 

 but cabbage following tomatoes would make a good 

 rotation. 



