rRACTICAL AGRICULTURE. SSft- 



ley. The clover, bein^ sown with the barley, fills the 

 ground with its roots, and thus prepares it for wheat. 

 For heavier clayey soils, a six years' rotation is there 

 preferred, in which wheat, oats, and beans, are made 

 to occur as often as possible. 



437. In this country, our climate is different. Un- 

 der our scorching suns, turnips can never be grown as 

 advantageously as in the humid atmosphere of Eng- 

 land ; and here, Indian corn, which cannot be grown 

 there, will always be an important crop. English 

 usage therefore throws little light on our course. That 

 the principle of rotation in crops ought to be adopted, 

 there can be no doubt ; but, as yet, no very specific 

 rules have been laid down, or, if laid down, they have 

 not, so far as I am aware, been confirmed by practice. 

 The composition of plants, so far as their inorganic 

 elements are considered, is various. Some, it will be 

 seen (Table Y.), require a large amount of certain in- 

 gredients, while others require little of these, but 

 draw largely upon other ingredients. We have, then, 

 as a general rule, i/) let those which are unlike in their 

 requirements follow each other, 



438. There are other topics on which I would gladly 

 dwell. I would gladly recall some on which 1 have 

 spoken, with a view to repeat and enlarge, and to 

 urge them on the consideration of practical farmers. 

 But the limits I have assigned to myself are already 

 more than reached. I cannot, however, close this 

 little work without a few suggestions to that class of 

 men, whom, if any, it is adapted to benefit. I have 



