Effects of ammonium sulphate and urea on NO3? and NO2? accumulation,nutrient contents and yield criteria in spinach |
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| Institution: | 1. Centro de Investigación en Recursos Naturales y Sustentabilidad, Universidad Bernardo O''Higgins, Fabrica 1990, Segundo Piso, Santiago, Chile;2. Laboratorio de Salud Pública, Ambiental y Laboral, Servicio Regional Ministerial, Ministerio de Salud, Región Metropolitana, Santiago, Chile;3. Facultad de Ingeniería, Departamento de Ingeniería Geográfica, Universidad de Santiago de Chile, Av. Libertador B. O''Higgins 3363, Santiago, Chile;4. Facultad de Química and Biología, Universidad de Santiago de Chile, USACH, Casilla 40, C.P. 33, Santiago 9170022, Chile;5. Center for the Development of Nanoscience and Nanotechnology, CEDENNA, Santiago 9170124, Chile;6. Instituto de Ciencias Biomédicas, Universidad Autónoma de Chile, Chile;7. Wadsworth Center, New York State Department of Health, and Department of Environmental Health Sciences, School of Public Health, State University of New York at Albany, New York 12201-0509, United States |
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| Abstract: | In this study, effects of ammonium sulphate (AS) and urea fertilizers on NO3? and NO2? accumulation, N, P, K, Ca, Mg, Fe, Cu, Zn, Mn contents and some yield criteria in spinach were investigated. Increments in nitrogen doses of AS and urea from 0 (control) to 150 kg N level ha?1 increased NO3?, NO2?, total N contents and yield of spinach significantly, but usually decreased P, Zn and Mn contents. NO3? contents of spinach in 120 and 150 kg N ha?1 of urea applications were higher than that of AS applications, while the NO3? contents of spinach in the lower application doses of AS were higher than that of urea applications. Increasing phosphorus availability in the higher doses of AS applications due to possibility of decreasing soil pH might be decrease NO3? accumulation in spinach by assimilating NO3? in protein form. NO3? and NO2? contents also gave the significant negative relationships with yield and P content in spinach. Decreasing micronutrient contents in spinach at the higher nitrogen doses might be due to dilution effect by increasing the plant biomass. |
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