title: Assessing the subsequent effect of nitrogen released from tobacco-waste on maize crop using a ¹⁵N isotope technique.
abstract: The investigation of the residual effect of nitrogen (N) released from tobacco-waste (TW) using isotope techniques will provide valuable data for sustainable organic farming. For this aim, a pot experiment was conducted using the (15)N isotope technique. The experiment was based on a completely randomised design with four replications and was conducted on a calcareous ustochrepts soil. TW at levels of 0, 10, 20, 30 and 40 t ha(-1) and N fertiliser as (NH₄)₂SO₂ at levels of 0, 20, 40, 60 and 80 kg N ha(-1) were used for the Bezostaja-1 wheat variety. Concerning mineral N fertilisation with 20 and 80 kg N ha(-1), additional treatments with (15)N-labelled (NH₄)₂SO₂ (10 at.% exc.) have been applied. Following harvesting wheat plants, the Pioneer 3377 maize variety was used to see the residual effect of TW. After harvesting, dry matter yields were recorded and total N concentrations were determined. (15)N determinations and calculations were also made for (15)N treatments separately. TW had a significant residual effect on the growth of corn plant under the pot condition. Increasing rates of TW significantly increased the dry matter yield of corn plant following wheat from 3.31 t ha(-1) (at control) to 7.89 t ha(-1) (at the TW treatment of 40 t ha(-1)). The (15)N values derived from the (15)N fertiliser decreased with increasing TW application. The average values of N derived from N fertiliser (Ndff) varied from 2.14 to 3.09% at the rates of 20 and 80 kg N ha(-1), respectively. However, N derived from TW (Ndftw) significantly increased from 16.93 to 24.59% (at 20 kg N ha(-1)), and it also increased from 23.06 to 28.15% (at 80 kg N ha(-1)) with increasing TW applications from 20 to 40 t ha(-1), respectively.
authors.affiliation: Department of Soil Science and Plant Nutrition, Agricultural Faculty, Gaziosmanpaşa University, Tokat, Turkey. rkaraman2000@hotmail.com
authors.forename: M Rüştü
authors.initials: MR
authors.lastname: Karaman
authors.forename: A Reşit
authors.initials: AR
authors.lastname: Brohi
mesh_terms: D005308:Fertilizers / Q000032:analysis*; D009584:Nitrogen / Q000032:analysis*; D009587:Nitrogen Isotopes / Q000032:analysis; D058871:Organic Agriculture / Q000379:methods*; D011897:Random Allocation; D012987:Soil / Q000737:chemistry / Q000592:standards; D014026:Nicotiana / Q000737:chemistry*; D014866:Waste Products / Q000032:analysis*; D003313:Zea mays / Q000254:growth & development*
chemical_list: D005308:Fertilizers; D009587:Nitrogen Isotopes; D012987:Soil; D014866:Waste Products; D009584:Nitrogen