Show Striving Str i v i ng for f or L Large arge i Increases of Crops Cl OPS Of Importance to Recognize R S Three Factors tea States Department United Prepared by tho the of Agriculture out by the tho It Is frequently tr pointed United States of the bureau of soils o of ot Agriculture that Unit tho the Department the nation will have hn-e to depend upon cultivation of ot the soil for about one one- wheat corn and third of Its combined rotation for produced upon crop oats ats of the thc use nse another mother third and rind upon commercial fertilizers forthe for tor and manures Is logical that cultivation cul cuI the Jie of other her third It rotation and fertilization aids both rotation aids In rendering that fertilizers more mire effective and that fertilizers fer fer- fer- fer the value of rotation r Increase In h I however however how how how- experiments ent Re Recent that that- rotation n ever bing out tl the e fact rs when wl en nd the use nse of fertilizers 1 L L th f ex ex- J Interact t to U the UJ e extent tl e together may rn y effects as meas measured s. s tent that Increase s 1 s tired In terms of crop be not only equal al to but greater e er than lr separate effects the ti-jo sum sura or of tr yield of f corn c obtained The he avera average ver without fertilizers nn 3 l rotation In this particular exp experiment was as b bushels bushels' due to to using using for for- per per acre acre Th The gain U ers and n a lime hare lime was was 92 92 bushels I per p r a acre re and n the gain due to rotation alone was was bushels or practically pr ly obtained l from fro the fer fertilizers fer er- er three r times that and an lime The total Increase i rotation and the thee effected by conjoining e of fertilizers was vas bushels bushels' per use the than thab acre or or 72 bushels bushels' greater urn of ot their separate Increases Other q cr have e corroborated which emphasize the tho these Ulese results ed all thi three c e importance f co soil soli vIng for permanent factors In str striving productivity S |