ENRICHlNc; SOIL — ('UMMKKCIAI, KKSOl'RCES lUI 



1<)0. Again, no n»sults can bo obtained from 

 ill.' addition of ono ol»Mn«Mit unless the other 

 twn are present in sullieit'nt <inanlity. In gen- 

 cial, therefore, it is safrr to apply complete 

 fertilizers. 



1<)1. Vet, in some eases, it is unwise to 

 apply eompleto fertilizers. This is partieularly 

 truf of the a}>plieation of nitrogen. The gnnvth 

 may ain'ady be so heavy that the mlditioii of 

 nitrogen \vt)uld eause an overgrowth, and yet 

 the plants may Ufcd fertilizing. This danger 

 of too mueli growth is greatest with fruit 

 plants (111). 



It)'-'. If nitrogen eonduees espe<'ially to leaf 

 growth (lo4), then it must be the clement 

 whii'li is most imjiortant in the ft'i-tijizing ol 

 the vegetables which are grown foi- their leaver 

 or succulent stalks, as rhubarb, eal>bago, let- 

 tuce, spinach, asparagus ; and it is also very 

 important in the growing of hay and succulent 



fi)ilder. 



1<).{. Nitrogen leaches rajudly, especially if 

 applied in the form of nitrate of soda or sulfate 

 of ammonia. It is, therefore, advisal)le to ap- 

 ply it in the spring ; and when use<l in liberal 

 amounts, it shouM be apjdicd at intervals, and 

 not all at one time. 



\i'A. Phosj)hori<* acid and potash, even if 

 soluble, do uot leach badly, as a rule, because 



