in 



cul- 



— 67-- 



A. These words mean that, with few exceptions 

 the same seed or seeds of the same kind should not 

 be sown two or three years consecutively in the 

 same fields. 



Q. What inconveniences result from sowing the 

 same seeds, two or three years consecutively on the 

 same field. 



A. The principal iL^onvenience is that the seed 

 finds no longer the nourishment it requires 



Q. Explain why the seed does not find the nou- 

 ishment it requires ? 



A. It is an established fact that each kind of seed 

 takes from the soil a certain quantity of the nutritive 

 elements which it contains ; it is also well known 

 that these nutritive elements are of various kinds 

 and that they are not taken up equally and in the 

 same proportion by the different plants. Thus, for 

 instance, while certain plants take from the soil 

 much lime and a small quantity of its potash, others 

 on the contrary take much potash and little lime, 

 etc. It is evident from this that if the same seed is 

 sown for two or three consecutive years in the same 

 field, it will eventually not find a sufficient quantity 

 of the nourishment it requires. 



Q. Give some illustrations. 



A. Wheat should not be sown two consecutive 

 years in the same field, neither barley nor rye, nor 

 vegetables etc. 



