INFLUENCE OF SOIL TEXTURE, REACTION, AND TEMPERATURE ON THE UPTAKE OF NITROGEN FROM THREE NITROGEN FERTILIZERS
[摘要] RyegrasswasgrownonfoursoilsvaryingintextureandpH,inhalf-gallonglazedpotsforaperiodof8monthsinthegreenhouse.A6-weekcoolperiodat35°F.wasemployedfollowingthefirstcutting.Nitrogenwastop-dressedattherateof80 lb.nitrogen/ac.,intheformofeitherurea,ammoniumsulphateorcalciumnitrate.Thesematerialswereaddedaftergerminationoftheryegrassinonetreatment,andbeginningthecoolperiodinasecondtreatment.From50to100percentoftheaddednitrogenwasrecoveredinplantmaterialandleachates.Calciumnitrategavethehighestrecoveryofnitrogenonallsoils.Nodifferencewasfoundbetweenammoniumsulphateandureaintheuptakeandleachingofnitrogen.Ureawasconvertedtoammonia,attemperaturesaslowas35°F.Theapplicationofnitrogenbeforethecoolingperiodextendedtheperiodofuptakebythecrop.Itwasconcludedthatthebehaviourofnitrogenfertilizersinsoilisdependentonboththetextureandreactionofthesoil,thatthem...
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[效力级别] [学科分类] 农业科学（综合）
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