Soil Science Society of America Journal · 1968 · 25 citations · 0 references
AgricultureAgronomySoil SciencesNutrient ManagementSoil FertilitySoil ScienceNitrogen ManagementNitrogen NutritionNutrient AvailabilityNutrient Uptake By PlantsPlant Nutrient UptakeSoil Nutrient AvailabilityNitrogen Fertilization EffectsNitrogen Fertilizer ManagementNitrogen Uptake DynamicsPlant Nitrogen UptakePlant UptakePlant-available NitrogenSoil Nitrogen AssessmentSoil Nitrogen Availability Assessment
Abstract Three ammonium‐tagged fertilizers, two nitrate‐tagged fertilizers, and N‐tagged urea were added to three soils in green house pots. Plant uptake of surface‐applied fertilizer N was measured by growing four crops over a period of 314 days. In another experiment, tagged ammonium sulfate, ammonium nitrate, and aqueous ammonia, were compared using band application. With surface application, uptake of fertilizer N in plant tops varied from 35 to 71%, with nitrate sources showing the higher values. Residual N in soil ranged from 18 to 41%, and its availability decreased with successive crops. All ammonium sources suffered some loss with surface application, especially aqueous ammonia, but losses were negligible with band application. Availability of soil N was influenced to some extent by the nature of the fertilizer applied. From 5 to 13% of the soil N was utilized by four crops.