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Plowed, 12-14; 1st yr. corn, 65.7 2nd yr. corn, 63.6;
Cisne silt loam - Av. 13 yr.
Depth Plowed No fertilizer RLPK 1/ Ordinary plowing, 16.1 ; Subsoiled, 15.6; Ordinary plowing, 39.6; Subsoiled, 36.4. Rotation on Flanagan silt loam - corn, corn, oats, sweet clover. Rotation on Sisne silt loam - corn, soybeans, wheat, red clover.
In conclusion they had the following to say: “Many other references on subsoiling could be citecf, but the conclusions would still be the same as the one reached in 1918 (Jour. Agr. Res. 14:481521) and quoted in a recent book (Soil Conditions and Plant Growth, 1952): ‘Yields cannot be increased nor the effects of drought mitigated by tillage below depth' of ordinary plowing. The quite general popular belief in the efficiency of deep foundation of fact, but is based on misconceptions and lack of knowledge of the. form and extent of the root system of plants and of the behavior and movement of water in the soil.” R. S. Stauffer, 12-28-53.
74.7%