ORTA ANADOLU KURU KOŞULLARINDA KIŞLIK VE YAZLIK OLARAK EKİLEN ARPA’DA FARKLI GELİŞME DÖNEMLERİNE AİT AZOT ALIMLARININ N-15 TEKNİĞİ İLE İNCELENMESİ

Öz

Orta Anadolu kuru koşullarında kışlık ve yazlık olarak yetiştirilen arpa (Hordeum vulgare) bitkisinin farklı büyüme dönemlerinde, H₁: başaklanma, H₂: dane dolum ve H₃: hasat’a ait verim, N-15 alımları ve gübre kullanma randıman değerlerini belirlemek amacıyla bir tarla denemesi kurulmuştur. Deneme tesadüf blokları deneme desenine göre bölünmüş parseller olarak 4 tekrarlı kurulmuştur. Kışlık arpa Ekim’de ve yazlık arpa Mart’ta, ekim oranı 200.0 kg/ha ve sıra arası 20.0 cm olarak ekilmiştir. Kışlık arpa’ya 40.0 kgN/ha hesabıyla 3.02 % N-15 atom excess ve yazlık arpa’ya 40.0 kgN/ha hesabıyla 2.80 % N-15 atom excess’lik amonyum sülfat gübresi uygulanmıştır. Bitki örnekleri farklı gelişme dönemlerinde hasat edildi ve toplam azot analizleri Kjeldahl metodu ile ve % N-15 atom excess analizleri N-15 emisyon spektrometresi ile yapılmıştır. Elde edilen sonuçlarda kışlık arpanın kuru madde verimleri (dane+sap), N-15 alımı ve N kullanma randımanı değerlerinin yazlık arpa’dan yüksek olduğu görülmüştür. En yüksek N-15 alımı ve N kullanma randımanı değerleri dane dolum döneminde bulunmuştur. Hasat döneminde ortalama azot kullanma randımanı değerleri kışlık ve yazlık arpa için sırasıyla % 66.0 ve % 24.1 bulunmuştur.

Anahtar Kelimeler

• N-15 izotop tekniği,azot kullanma randımanı,farklı gelişme dönemleri,arpa

THE INVESTIGATION ON NITROGEN UPTAKE AT DIFFERENT GROWING STAGES OF WINTER AND SUMMER CULTIVATED BARLEY UNDER DRYLAND CENTRAL ANATOLIA CONDITIONS USING N-15 ISOTOPE TECHNIQUE

Öz

In order to determine the yield, N-15 uptake and nitrogen use efficiency values at the different growing stages which were H₁: heading, H₂: grain filling and H₃: harvesting stages of winter and summer cultivated barley (Hordeum vulgare) under dryland Central Anatolia, a field experiment was carried out. Experiments were conducted using randomized block design as split plot for 4 replications. Winter barley was sown in October and summer barley was in March as 200.0 kg/ha sowing rate and 20.0 cm row spacing. For winter barley 40.0 kgN/ha as 3.02 % N-15 atom excess and for summer barley 40.0 kgN/ha as 2.80 % N-15 atom excess ammonium sulphate fertilizer were applied. Plant samples were harvested at different growth stages and total nitrogen using by Kjeldahl method and % N-15 atom excess using by emission spectrometer analyses were done. Obtained results showed that the winter barley had higher dry matter yields (seed+straw), N-15 uptake and N-use efficiency values than summer barley. The highest amount of N-15 uptake and N-use efficiency were found at the grain filling stage. The average of nitrogen use efficiency values were found 66.0 and 24.1 % for winter and summer barley at harvesting stages, respectively.

Anahtar Kelimeler

• N-15 isotope technique,nitrogen use efficiency,different growing stages,barley

Kaynakça

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