Nitrogen Uptake and Use Efficiency of Irrigated Bread Wheat (Triticum aestivum L.) as Influenced by Seed and Nitrogen Fertilizer Rates at Werer, Afar National Regional State, Ethiopia

Birke Bahiru, H. Ashagre, Mihratu Amanuel
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Abstract

An offseason field experiment was conducted in 2015-2016 at Werer Agricultural Research Center Middle Awash, Afar regional state to determine N-uptake and use efficiency of irrigated bread wheat (Triticum aestivum L.) as influenced by seed and nitrogen fertilizer rates. The experiment was laid down in a randomized complete block design (RCBD) with three replications. The treatments were factorial combination of five nitrogen levels (0, 23, 46, 69, and 92 kgNha-1) with four seed rates (75, 100, 125, and 150 kgha-1). The results of the study showed that both main and interaction effect of nitrogen and seed rates significantly affect N concentrations of the grain and straw, Nuptake, apparent nitrogen recovery, agronomic and physiological efficiencies, nitrogen use efficiency, grain protein content, and N harvest index. The apparent recovery, agronomic and physiological efficiencies and nitrogen use efficiencies decreased with increasing N-rate. Concentration of N and total nitrogen uptake in straw and grain, grain protein and NHI were increased as the N rate increased, while decreased with the increment of seed rate. In conclusion, rate of nitrogen fertilizer applied and seed rate affect the N-uptake and N-use efficiencies.
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埃塞俄比亚阿法尔国家地区Werer地区种子和氮肥用量对灌溉面包小麦氮素吸收和利用效率的影响
2015-2016年,在阿法尔州中部阿瓦什的Werer农业研究中心进行了淡季田间试验,研究了施氮量和施氮量对灌溉面包小麦(Triticum aestivum L.)氮素吸收和利用效率的影响。试验采用随机完全区组设计(RCBD), 3个重复。5个氮素水平(0、23、46、69和92 kgNha-1)和4个种子率(75、100、125和150 kgNha-1)的因子组合处理。结果表明,施氮量和种子量的主效应和互作效应对籽粒和秸秆氮素浓度、氮素吸收、表观氮素恢复、农艺和生理效率、氮素利用效率、籽粒蛋白质含量和氮素收获指数均有显著影响。表观恢复率、农艺生理效率和氮素利用效率随施氮量的增加而降低。秸秆和籽粒氮素浓度、总氮吸收量、籽粒蛋白质和氮肥含量均随施氮量的增加而增加,随播种率的增加而降低。综上所述,施氮量和种子量影响氮素吸收和氮素利用效率。
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