| Show SOIL SOIL measurements measurements recently made at the station show that if all the particles t 0 in a pound of soil could be flattened 4 I 1 out so that each one exposed its own natural surface the area covered would r range ange from about one tenth acre an in the case of a sandy loam to over three acres in the case of a heavy clay 41 since an 1 acre foot of soil weighs about it four million pounds the amount of solid surface in the immediate feed ing zone of plants gro growing on an acre of df heavy clays clay is nearly ono one fourth of the area of the state of utah this coll osal exposure of surface is s the secret of the soils soil power to ito sustain jve vegetation g e tation by it a reserve supply of moisture is held for weeks or even 1 T months to be used as the diee needs 6 of the plant demand by it the mineral foods of the plant the lime the phosphorus ahe potash an and d the nitrogen are rendered available in sufficient quantity uto to aarish the plant the amount of surface in a given case determines how aa heavy vy the soil is and its dispo 1 ji iii tion determines how the land should j fee tilled VC t |
