. Elementary lessons in the physics of agriculture . Fig. 59. 208. The Subsoil Plow.—One type of this instrument is represented in Fig. 60. Its function is nominally to loosen the ground to a greater depth than is practicable with the ordinary plow, thus securing deeper tillage with- out burying the humus-bearing soil too deeply below the surface, its use requires great discretion, otherwise more harm than good may result from it. Better aeration, bet- ter drainage, deeper development of roots and less suffer- .ing from drought are advantages claimed for its use. For large yields of root crops
. Elementary lessons in the physics of agriculture . Fig. 59. 208. The Subsoil Plow.—One type of this instrument is represented in Fig. 60. Its function is nominally to loosen the ground to a greater depth than is practicable with the ordinary plow, thus securing deeper tillage with- out burying the humus-bearing soil too deeply below the surface, its use requires great discretion, otherwise more harm than good may result from it. Better aeration, bet- ter drainage, deeper development of roots and less suffer- .ing from drought are advantages claimed for its use. For large yields of root crops a deep loose soil is indispensable, and one necessity for this is found in the fact that the thick roots require so much space which can only be se- cured by forcing the soil aside. There is great danger of puddling the soil in the use of the subsoil plow, because
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