Published in Scientific Papers. Series A. Agronomy, Vol. LX
Written by Deniz İŞTİPLİLER, Uğur ÇAKALOĞULLARI, Özgür TATAR
Water and nitrogen are both most limiting factors for plant growth and productivity. Effects of different nitrogen applications on grain yield of wheat under terminal drought stress were investigated in the present study. A field experiment was conducted with a bread wheat cultivar Gönen in two experimental sites characterized by loamy-sand (Menemen) and clay-loam (Bornova) soils. Rainout shelters were used to exclude rain from drought imposed plots during grain filling stage. Gradually decrease in soil moisture content caused significant decrease in grain yield in both experimental sites. However, higher yield were recorded in loamy-sand soils (LSs) than clay-loam soils (CLs) in all treatments. Thousand grain yield and grain number per spike were also decreased due to drought conditions. Similar to grain yield, both parameters were also significantly lower in CLs than LSs. Split nitrogen treatment included flowering stage caused a significant decrease in grain yield because of lower biomass production during earlier development stages. Our findings suggested that higher biomass which could be obtained by high earlier nitrogen application may provide an advantage in wheat production for later drought conditions
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