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Nitrogen Uptake and Utilization Efficiency of Malting Barley as Influenced by Variety and Nitrogen Level

Author:
Kassie, Meharie, Fanataye, Kindie
Source:
Journal of crop science and biotechnology 2019 v.22 no.1 pp. 65-73
ISSN:
1975-9479
Subject:
fertilizer rates, grain yield, grains, growing season, malting, malting barley, nitrogen, nitrogen fertilizers, nutrient use efficiency, straw, Ethiopia
Abstract:
Nitrogen (N) is the primary driver of crop production and it is heavily used in modern agriculture to maximize yield. However, the effectiveness with which N is used by cereals has become increasingly important because of both financial and environmental costs to N fertilization. The aims of this study were to determine the effects of N fertilization rate, variety, and growing season on grain yield, N uptake, and N-efficiency traits of malting barley at Bekoji, southeastern Ethiopia. The treatments studied were five N levels (0, 23, 46, 69, and 92 kg ha⁻¹) and two malting barley varieties (Miscal-21 and Holker) over three seasons (2012, 2013, and 2014). The results showed that as N rates increased, malting barley grain yield, grain, straw, and total N uptakes increased, but N-harvest index, N-use efficiency, N-recovery efficiency, and N-utilization efficiency decreased. Grain yield, grain, and total N uptake, N-harvest index, N-use efficiency, N-recovery efficiency, and N-utilization efficiency were greater in Miscal-21, whilst straw N uptake were greater in Holker. Grain yield, grain, straw, and total N uptake, N-recovery efficiency, and N-harvest index were greater in 2012 than in 2013 and 2014, but growing season had no effect on N-use efficiency and N-utilization efficiency. Grain yield was positively correlated with N-efficiency traits, but the role of N-recovery efficiency in enhancing grain yield was larger than the role of N-utilization efficiency.
Agid:
6354628