Estimation of soil N-supplying capability in NaHCO3 extracts by UV absorbance method in Samsun region soils Samsun yoresi topraklarinin azot saglama kapasitelerinin NaHCO3 ekstraktinda UV absorbans yontemiyle belirlenmesi

Korkmaz A., GÜLSER C.

Turkish Journal of Agriculture & Forestry, cilt.19, sa.5, ss.319-326, 1995 (Scopus) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 19 Sayı: 5
  • Basım Tarihi: 1995
  • Dergi Adı: Turkish Journal of Agriculture & Forestry
  • Derginin Tarandığı İndeksler: Scopus
  • Sayfa Sayıları: ss.319-326
  • Ondokuz Mayıs Üniversitesi Adresli: Hayır

Özet

The incubation and UV absorbance methods are compared with regards to determination of the N-supplying capability of soils. In this pot experiment conducted with 15 soils and three replicates, sunflower was used as a test plant and 15N enriched (3.6% atom excess) urea was applied to the soils at the rate of 0-100 ppm N. The UV absorbance value obtained at 205 and 220 nm with 0.01 M NaHCO3 extract correlates more with "A' values (respectively, r=0.820** and 0.840**) and other biological indexes (the amount of N in the plants to which had been applied urea derived from the soil "mgN/kg soil', relative yield "%', dry matter yield "grDM/pt', and uptake N "mgN/kg' in the controls pots "No'). -from English summary