KKVIKW OF TllF, BOOK 801 



its»-lf is very dry, may it »till l>o of iixrT At wlint time of the 

 yi'iir \a enrlli-iuuU-li iimst usffnIF Wluit relation b;i8 huifuee 

 tillnpu to weeds f Why do wo till? 



Name tools tlint linve n compnctinp influence on noilg. Nnrae 

 some im|>ortHnt u«es of tho compnctiii); of tlio soil. Wlmt ia the 

 benefit of rolling the lamif Whiit nre tho disndvnntnce«f Whut 

 relation has tho rollint; to perminnlion of 8er<l!»T Wlmt relation 

 to «oi| m«)if*tiiref Does tho roliini^ of the laud require much 

 judgment f Why? 



(liaptcrs .'> and 6 



"We now consider tlio enrirhinfj (f the soil. 

 We liave found tliat the soil is niadt> to l»e niurc 

 prodiietivo hy tlioroni^li i)reparati<>ii and liy sub- 

 sequent tillage. The i)lants are eiial)!**! to hiy 

 hold of the stores of ])lant-food, and many 

 chemical activities nre s«'t u|) that result in 

 rendering plant-food more availahh*. The plant 

 is given a comfortable and conirt'iiial pla«'<> in 

 which to grow. It thrives. We have found 

 that tho physical structure or condition of tiie 

 soil is of primary importance. When we have 

 secured tlie best physical condition and have 

 done our best with tillage, we may then think 

 of adding extraneous materials to tho soil for 

 tlie purpose of enriching it. That is, we manure 

 or fertilize the lan«l. Whether thi^^ fertilizing 

 pays or not, depends wholly on conditions. The 

 addition of mere plant-food is rarely profitaV)le 

 unless the land is first in con<lition for the very 

 best growiiiiT of tlie plant. 



