Journal of the American Society for Horticultural Science · 1982 · 20 citations · 9 references
AgricultureAgronomyPlant SciencesCrop PhysiologyPlant NutritionPlant PhysiologyNitrogen AssimilationNitrogen CycleNitrogen ManagementNitrogen NutritionNutrient AvailabilityPotassium NutritionInterveinal ChlorosisLeaf ChlorosisLeaf Nitrogen ContentNitrogen Fertilization EffectsNitrogen ToxicityPlant Nitrogen UptakePlant-available NitrogenSymptoms Of Nutrient Toxicity
Abstract ‘Forever Yours’ roses ( Rosa Hybrid Tea) were grown in recirculating nutrient solutions at 1.0 and 10.0 meq/liter K in combination with 10.0 meq/liter NO 3 -N or NH 4 -N. Low K limited the growth and flower production, regardless of N form. Ammonium-N fertilized plants showed NH 4 -N toxicity symptoms as interveinal chlorosis of the lower leaflets. An increased K supply reduced NH 4 -N toxicity symptoms. Concentrations of Ca and Mg were lower, while P was higher, in the tissue of NH 4 -N fertilized plants, as compared to NO 3 -N fertilized plants. Total N, alcohol insoluble N, soluble organic N, and NH 4 -N were higher in the tissue of plants which received NH 4 -N, as compared to NO 3 -N, regardless of K level. An increased K supply from 1.0 to 10.0 meq/liter resulted in higher NO 3 -N in NO 3 -N fertilized plants and lower NH 4 -N in NH 4 -N fertilized plants.
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