AVAILABILITY OF REACTION PRODUCTS OF FERTILIZER PHOSPHORUS TO ALFALFA AND BROMEGRASS SEEDLINGS
[摘要] Increasingtheperiodofcontactof32P-labelledCa(H2PO4)2fertilizerwithanalkalinesoilatratesof35and70 μgP/gsoilbeforeplantingalfalfaandbromegrassdecreasedthedrymatteryieldanduptakeoffertilizerPbytheplantsatfiveweeks.FractionationofthesoilP,accordingtoChangandJackson,showedthat50%oftheappliedPaccumulatedintheNH4-Fsolublefractionand30%intheNaOH-solublefraction.Lessthan6%wasrecoveredintheH2SO4-solublefraction.UptakeoffertilizerPbyalfalfaandbrome-grasswasnegativelycorrelatedwiththeNaOH-solublefractionwhereastheuptakebyalfalfawaspositivelyassociatedwiththeNH4Cl-solublefraction.
[发布日期] [发布机构]
[效力级别] [学科分类] 农业科学（综合）
[关键词] [时效性]
