EFFECTS OF VARYING LEVELS OF PHOSPHORUS AND POTASSIUM APPLICATIONS ON PRODUCTIVITY, AND BOTANICAL AND CHEMICAL COMPOSITION OF A LADINO CLOVER-TIMOTHY ASSOCIATION

摘要

Phosphorusandpotassiumwereappliedseparatelyatfivelevelsa€”0,60,120,180and240poundsperacrea€”andinallcombinationspriortoseedingaladinoclover-timothymixture.Plotswerecutfourtimesperseasontoaheightof3inches.Forageyieldswereobtainedduring1954,1955and1956fromaseedingmadein1953onCoaticooksiltloamsoilattheExperimentalFarm,Lennoxville,Quebec.Phosphorusfertilizationhadnosignificanteffectoncloveryieldsbutcauseddistinctincreasesintimothyyieldsin1954and1955.Cloveryieldsincreasedlinearlywithincreasinglevelsofpotassiumupto120poundsperacrein1954andupto180poundsin1955.In1956,theincreaseinyieldswasalinearfunctionofratesofpotassiumapplication.Potassiumfertilizationdepressedtimothyyieldsin1954buthadnoeffectin1955and1956.Thepercentageofcloverintheharvestedforagetendedtoincreasewithincreasingratesofpotassiumandtodecreasewithincreasingratesofphosphorus.Thereversewa...