Effects of increased ammonia on root/shoot ratio, grain yield and nitrogen use efficiency of two wheat varieties with various N supply
Jing, L.,Northwest A and F Univ., Yangling (China). State Key Lab. of Soil Erosion and Dryland Farming on Loess Plateau | Shi-Qing, L.,Northwest A and F Univ., Yangling (China). State Key Lab. of Soil Erosion and Dryland Farming on Loess Plateau | Yi, L.,CAS and MWR, Yangling (China). Inst. of Soil and Water Conservation | Xiao-Li, C.,CAS and MWR, Yangling (China). Inst. of Soil and Water Conservation
The effects of elevated atmospheric NH3 on growth and yield characteristics of two winter wheat varieties, the high water and fertilizer-demanding variety Xiaoyan 6 (XY6) and the drought-resistant variety Changhan 58 (CH58), grown with two levels of N fertilization, were studied in Open-Top Chambers. The results showed that in combination with the high N treatment increasing the atmospheric NH3 concentration to 1,000 nL/L from the ambient level of 10 nL/L NH3 significantly reduced the biomass and the root/shoot ratios of the plants, especially in XY6 plants, mainly because it negatively influenced root biomass production at anthesis and mature stages. In addition, the grain yield of XY6 was by 1.51% higher, while that of CH58 was by 13.2% lower, following exposure to the elevated atmospheric NH3 concentration rather than the ambient concentration in combination with the high N treatment. In contrast, in combination with the low N treatment, elevated atmospheric NH3 had significantly and non-significantly positive effects on the grain yield of XY6 and CH58 plants, respectively. The N use efficiency and related characteristics were all lower in plants of both varieties exposed to the high atmospheric NH3 concentration together with either the high or low N treatment.
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