Kuraklığın Kışlık Buğdayın Gelişmesi ve Verimine Etkisi

Parsel örtülerinin kullanıldığı bu tarla denemesinde, kuraklığın Doğu-88 kışlık buğday çeşidinin gelişmesi ve verimine etkisiincelenmiştir. Sulu koşullar (SK), kuru koşullar (KK), erken kuraklık (EK), geç kuraklık (GK) ve tam kuraklık (TK) uygulamalarınıiçeren araştırma, Erzurum koşullarında yürütülmüştür. EK; SKa göre birim alandaki tane sayısının % 44.4, 1000 tane ağırlığının % 6.9, tane veriminin ise % 40.6 oranında azalmasınaneden olmuştur. GKın yeşil dokulardaki yaşlanmayı hızlandırması; daha kısa yeşil alan süresi (27.5 gün), daha düşük 1000 taneağırlığı (3.8 g) ve tane veriminde azalma (% 24.0) ile sonuçlanmıştır. TK, SKa göre birim alandaki tane sayısını % 54.9, taneağırlığını % 19.9, tane verimini ise % 65.6 oranında azaltmıştır. Tane verimindeki varyasyon esas olarak uygulamaların birim alan-daki tane sayısı üzerindeki etkisinden kaynaklanmıştır. EK başlıca birim alandaki tane sayısını, GK ise tane ağırlığını sınırlamıştır. EKıntane verimine olumsuz etkisi GKa göre daha fazla olmuştur.

The Effect of Drought on the Growth and Yield of Winter Whea

The effect of drought on the growth and yield of Doğu-88 winter wheat variety was investigated in this field experi-ment using plot covers. Fully irrigated (FI), rainfed (R), early drought (ED), late drought (LD) and continuous drought (CD) treat-ments were studied under Erzurum conditions.ED decreased grain number per unit area by 44.4 %, 1000 kernel weight by 6.9 % and grain yield by 40.6 % compared with FI.A rapid senescence of green tissues in LD treatment also led to shorter green area duration (27.5 days), lighter 1000 kernel weight(3.8 g) and lower grain yield (24.0 %). CD treatment decreased grain number per unit area by 54.9 %, 1000 kernel weight by19.9 % and grain yield by 65.6 % compared with FI. Variations in grain yield depended mainly on the effects of treatments on grainnumber per unit area. ED limited primarily grain number per unit area while LD affected kernel weight. The negative effect of EDon grain yield was more significant than that of LD.

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