EFFECT OF VARIOUS NITROGEN FERTILIZERS ON MANGANESE AND IRON AVAILABILITY AS MEASURED BY INCUBATION AND SAND CULTURE STUDIES
[摘要] Aftertwomonthsofincubation,soilstreatedwithinorganicnitrogenfertilizerscontainedmoreavailablemanganesethanthosetreatedwithorganicsources,exceptforthioureawhichincreaseditveryconsiderably.ChangesinmanganeseavailabilitywerepartlyduetopHchangesandpartlytotheoxidation-reductioninfluenceofthenitrogencarriers.Changesinironavailabilitywereverysmallandthisispresumablyduetothechelationeffectofthehumicsubstancesreleasedduringincubationofsoilatroomtemperature.Nitrogensourcesinfluencednotonlymanganeseavailability,butalsomanganeseuptakebypotatoplantsgrowninsandcultures.Manganeseuptakewasaboutthesamewithnitrateandammoniumsalts;however,plantssuppliedwithphysiologicallyneutralandbasicnitrogencompoundscontainedappreciablylessmanganesethanthosesuppliedwithacidcompounds,althoughthepHofthesolutionwasthesameinalltreatments.
[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]
