title: (15)N investigation of nitrogen released from tobacco-waste to be utilized by maize crop.
abstract: The (15)N study aimed to estimate the portion of nitrogen released from tobacco-waste to be utilized by maize crop. Tobacco-waste at the levels of 0, 2, 4, 6 and 8 g pot(-1) and ((15)NH(4))(2)SO(4) as nitrogen fertilizer labelled with 5 at.% exc. at the levels of 0, 4, 8, 12 and 16 mg N pot(-1) together with a basal dressing of some nutrients were added to pots with Pioneer maize variety. After the harvest, dry matter yield was recorded and (15)N determinations and calculations were made. Tobacco-waste had a positive effect on the growth and on the nitrogen uptake of maize crop. Increasing the rates of tobacco-waste increased the dry matter yield of maize crop from 4.64 g pot(-1) (at control) to 7.22 g pot(-1) (at the tobacco-waste treatment of 8 g pot(-1)). The values of (15)N in the plant derived from nitrogenous fertilizer also increased with increasing nitrogen fertilizer levels, whereas they decreased from 0.427 % to 0.249 % with increasing tobacco-waste treatments from 0 to 8 g pot(-1), respectively. The average values of per cent nitrogen derived from nitrogenous fertilizer (Ndff) varied from 4.32 % to 7.95 % at the rates of 4-16 mg N pot(-1), respec-tively. However, Ndff decreased from 8.54 % to 4.99 % with increasing tobacco-waste treatments from 0 to 8 g pot(-1), respectively. Per cent nitrogen derived from tobacco-waste (Ndft) increased from 21.8 % to 38.5 % with increasing tobacco-waste treatments from 2 to 8 g pot(-1), respectively. The results have revealed that (15)N tracer technique was confidently used for the investigation of nitrogen levels released from tobacco-waste as organic waste to be utilized by maize crop.
authors.affiliation: Department of Soil Science, Agricultural Faculty, Gaziosmanpaşa University, Tokat, Turkey. rkaraman@gop.edu.tr
authors.forename: M Rüştü
authors.initials: MR
authors.lastname: Karaman
authors.forename: A Reşit
authors.initials: AR
authors.lastname: Brohi
authors.forename: Ali
authors.initials: A
authors.lastname: Inal
authors.forename: Akgün
authors.initials: A
authors.lastname: Aydeniz
mesh_terms: D000383:Agriculture; D003247:Conservation of Natural Resources; D004787:Environmental Pollution / Q000517:prevention & control; D005308:Fertilizers; D009584:Nitrogen / Q000032:analysis* / Q000378:metabolism; D009587:Nitrogen Isotopes; D014026:Nicotiana / Q000737:chemistry*; D014421:Turkey; D014866:Waste Products; D003313:Zea mays / Q000254:growth & development / Q000378:metabolism*
chemical_list: D005308:Fertilizers; D009587:Nitrogen Isotopes; D014866:Waste Products; D009584:Nitrogen