PHOSPHORUS UPTAKE BY ALFALFA AS INFLUENCED BY PHOSPHATE SOURCE AND MOISTURE
[摘要] Theeffectofphosphatesourceandsoilmoistureduringtheinitialsoil-fertilizerreactionperiodonsubsequentphosphorusuptakebyalfalfawasinvestigatedinagrowthchamber.Phosphate-treatedsoilswithmoistureadjustedtofourdifferenttensionswerestoredatapproximately18°C.for10weeks.Followingthisstorageintervalphosphorusuptakebyalfalfawasmeasuredusingashort-termtechnique.Phosphoruscontentandphosphorusuptakebybothtopsandrootsincreasedsignificantlywhenwater-solublematerialssuchasammoniumpolyphosphate,monoammoniumandmonocalciumphosphatewereapplied.Lesssolublesources,i.e.,hydroxyapatiteandanhydrousdicalciumphosphate,weremuchlesseffective.Calciummetaphosphateproducedintermediateresults.MoisturecontentofthesoilduringthereactionperioddidnotgreatlyaltersubsequentPuptake.Thewater-solublesourcesofphosphoruswereaffectedtothegreatestdegree.UptakeofPwassignificantlycorrelatedwiththeamountofPextractedbyNaH...
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[效力级别] [学科分类] 农业科学（综合）
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