RKVIKW OK TMi: HOOK 303 



nitro}fen-conBum«Ts, or those thiit tlo not ndil iiitrof;(>n to tho noil. 

 Do tht-y beloiiR to any one proup or family of iilnntttT Niiiiio the 

 thrpo prent Btaplo preon >imiinr*» crops of tho nilrot;i-ti-pulh»*riiip 

 clutts(lll). Whut is mfinit by iuteiiMive furuiiip i Ul^ t Whnt 

 by exteusive fiiriuinp ( 11 W>) f 



What id tho iJcnl method of Beeuring the preen-manuriiip 

 crop in pt'iuTal apricultiire (ll'J)f t'nii a rt'jrtilar rotation \<o 

 piactifi'il in tuost kiiul;! of intfiisive furniiugf Why inland bene- 

 tjtfd by bfinp ''re»ttd" in clovt-r or some otluT cropt Kxpiuin 

 how land may b«< bfiu-fiti-d Bometiim-s even by "ro8tin»;" in 

 w.-fdn. What aro tlio two values of preen- inanuro crops (114)T 

 U it true tliat preen-ninnures may be valuable even when more 

 pliint-food is not need'df Apply this to fruit-prowinp crops. 

 How nmy a system of preen -manure croppinp be inaupnrnttd on 

 hard and poor hindsf Where are cover-crops most uat-ful, and 

 why? IIow early should th-^ cover-crop in orchards be plowed 

 underT May wieils ever be tiseful in orchards late in thn senMonT 

 Why should tht-y not be allowed to prow early in tho season f 

 What are the disadvantages of allowinp weeds to prow even late 

 ill the season f 



What does the application of stable manure do for the landf 

 r|>on what does its value depend (119 if IIow should stable 

 manures bo protected or stored f Kxplnin whnt you understand by 

 a covere«l burnyard iliOfi). How are stable nmniireH afflicted by 

 exposure to the weatherT What is the viiliio of thorouphly rotted 

 manur»'T What is the philosophy of compontinp nianuresf When 

 the manures cannot bo sheltered or protected, whut disposition 

 may be made of theinf What precnutionsf 



What is the valiio of muekf What is peat, and what is its 

 ▼aluef Di*>ciis8 marl; also sawdust, straw, leaves, pomace, and 

 the 'ike. Under what conditions do you think it would pay to 

 ploi/ under straw? 



In Cliapt»'r \'I the general discussion of fcr- 

 tilizor substances is continuod, but in tliis case 

 tlio subjoct is commercial plant -foo<ls. This is 

 ft sul)j»H't of very preat importance, particularly 



