337-7 Preplant Soil Mineral Nitrogen for Fertilizer Recommendations for Wheat in Southeastern Turkey.

Poster Number 1269

See more from this Division: S08 Nutrient Management & Soil & Plant Analysis
See more from this Session: Nitrogen Management
Wednesday, November 3, 2010
Long Beach Convention Center, Exhibit Hall BC, Lower Level
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Ebru Karnez1, Hayriye Ibrikci1, Mahmut Cetin2, Sevilay Topcu2, Cevat Kirda2, Eren Oztekin1, Mahmut Dingil1, John Ryan3 and Kursat Korkmaz4, (1)Cukurova Univ. Faculty of Agric. Soil Sci. Dept., Adana, Turkey
(2)Cukurova Univ. Agricultural Structures and Irrigation Dept., Adana, Turkey
(3)ICARDA, Aleppo, SYRIAN ARAB REPUBLIC
(4)Ordu University, Ordu, Turkey
Preplant soil mineral nitrogen (Nmin, NO3-N + NH4-N) is widely used in N-fertilizer recommendations. We tested this approach in a large wheat-growing area in Turkey. Prior to planting, soil samples from the profile (0-30, 30-60 and 60-90 cm) were taken and analyzed for NO3-N and NH4-N to determine readily available Nmin. Soil samples (18 in 2007, and 36 in 2008) were taken from farmersí wheat fields in the irrigation district. Plant samples were also colleted to determine N uptake. There was considerable amount of Nmin (72 to 120 kg Nmin ha-1) in the effective rooting depth (0-90 cm) in both years. The wheat yield and total plant N uptake by grain and the biomass were significantly increased by the higher values of Nmin in the profile, especially in 2007. Even though soil types and wheat genotypes grown in the irrigation District are different, this meaningful relationship between soil Nmin and yield and N uptake suggest considering preplant soil N in fertilizer recommendations and using less N fertilizers, thus contributing to increase use efficiency. The approach could be widely used in Turkey.
See more from this Division: S08 Nutrient Management & Soil & Plant Analysis
See more from this Session: Nitrogen Management