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RISS 인기검색어
- 검색키워드
- 주제어 : nitrogen use efficiency(NUE) (검색결과 6 건)
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Areum Chun,Ho Jin Lee 韓國作物學會 2006 Korean journal of crop science Vol.51 No.1
The nitrogen (N) absorption and partition of the rice plants are important indicators that can be used to improve the N use efficiency (NUE) of the plants. Improving the plant NUE can help to avoid nutrient waste that may cause environmental pollution. To investigate the N absorption and partition of the rice plants, Hwaseongbyeo (Japonica) and Dasanbyeo (indica/japonica) were applied with N fertilizers at the rates of 60, 120, and 180 kg N per ha in paddy field. Also micro plots of 0.81m2 were established inside each plot for application of 15N-labeled fertilizer. The differences in N utilization of the rice plants were associated with the total N absorption and partitioning after the heading stage. In the grain filling period, the increase of nitrogen content in the total and leaf blades of Dasanbyeo was higher than that of Hwaseongbyeo. Soil N was the main contributor for the increase of total N of Dasanbyeo during the grain filling period. The N fertilizer uptake rate of Hwaseongbyeo rapidly increased with the increment of N fertilization rate. In Dasanbyeo, N fertilizer uptakes were similar under all rates and times of N application. From heading stage to harvest, Dasanbyeo continued accumulating nitrogen, whereas Hwaseongbyeo had small changes. In conclusion, the difference in nitrogen absorption and partition after heading of the two cultivars was caused by the ability of Dasanbyeo to accumulate and remobilize soil nitrogen to the grains during the grain filling period.
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Chun, Areum,Lee, Ho-Jin The Korean Society of Crop Science 2006 Korean journal of crop science Vol.51 No.1
The nitrogen (N) absorption and partition of the rice plants are important indicators that can be used to improve the N use efficiency (NUE) of the plants. Improving the plant NUE can help to avoid nutrient waste that may cause environmental pollution. To investigate the N absorption and partition of the rice plants, Hwaseongbyeo (Japonica) and Dasanbyeo (indica/japonica) were applied with N fertilizers at the rates of 60, 120, and 180 kg N per ha in paddy field. Also micro plots of $0.81m^2$ were established inside each plot for application of $^{15}N-labeled$ fertilizer. The differences in N utilization of the rice plants were associated with the total N absorption and partitioning after the heading stage. In the grain filling period, the increase of nitrogen content in the total and leaf blades of Dasanbyeo was higher than that of Hwaseongbyeo. Soil N was the main contributor for the increase of total N of Dasanbyeo during the grain filling period. The N fertilizer uptake rate of Hwaseongbyeo rapidly increased with the increment of N fertilization rate. In Dasanbyeo, N fertilizer uptakes were similar under all rates and times of N application. From heading stage to harvest, Dasanbyeo continued accumulating nitrogen, whereas Hwaseongbyeo had small changes. In conclusion, the difference in nitrogen absorption and partition after heading of the two cultivars was caused by the ability of Dasanbyeo to accumulate and remobilize soil nitrogen to the grains during the grain filling period.
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오광스티븐 ( Stephen Okwang ),손정우 ( Jung-woo Son ),장태일 ( Taeil Jang ),곽진협 ( Jin-hyeob Kwak ) 한국농공학회 2023 한국농공학회 학술대회초록집 Vol.2023 No.0
Open field crops play a significant agricultural role, covering about 85% of Korea's cultivated area. Ensuring efficient fertilizer application is essential to meet food demands, enhance yields, and address environmental issues. However, certain crops are not covered by the nutrient standards set by the Rural Development Authority (RDA), emphasizing the necessity for comprehensive guidance. Additionally, adapting to climate changes and other factors necessitates adjustments. In this study, nutrient uptake efficiency of buckwheat, sweet pumpkin, ginger, and cabbage will be tested. The study will be conducted in the main producer of each crop. A randomized block design was employed to evaluate the nutrient utilization efficiency of the specified field crops. For each selected crop, each block measuring 35x15m was divided into ten subplots of 5x5m, spaced 2m apart, with one of these subplots designated as the control plot. In each subplot, standardized rates of chemical fertilizer, cattle manure compost, and organic fertilizer (at 100%, 150%, and 200%) were applied before sowing, while only chemical fertilizer was used for top dressing. For a comprehensive soil study, samples were collected from each subplot at depths of 0-20cm and 20-40cm using an auger. These samples were then examined for texture, moisture content, total nitrogen (TN), total carbon (TC), pH, cation exchange capacity (CEC), and inorganic nitrogen (NH<sub>4</sub><sup>+</sup>-N and NO<sub>3</sub><sup>-</sup>-N) across various growth stages. Plant samples from 30x30cm areas in each subplot were also examined for fresh and dry weight, TC, TN for individual components, and post-harvest yield. Subsequently, nitrogen use efficiency (NUE) indices for each crop will be established, involving a comparison of plant-absorbed nitrogen to applied fertilizer nitrogen, while considering losses and soil recovery. The findings of this study have the potential to offer substantial insights into the modification of current fertilizer application methods, as well as guiding the development of fertilizer recommendations for crops that lacked precise guidance.
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Ruan Xinmin,Du Hongyang,Zhan Xinchun,Cong Xihan,Shi Fuzhi,Li Juan,Luo Zhixiang,Dong Zhaorong 한국식물생명공학회 2023 Plant biotechnology reports Vol.17 No.1
Developing genotypes with high-nitrogen use efficiency is a prerequisite for achieving sustainable agriculture and high yields. In this study, both physiological and metabolic analyses were performed to evaluate the NUE (nitrogen use efficiency) of two elite indica rice cultivars: OM052 and Huanghuazhan (HHZ). The pNUE and gNUE of OM052 were higher than HHZ under three N conditions, and significant (p < 0.05) especially under both LN and MN conditions. The contents of soluble sugar and malate were significantly different between OM052 and HHZ under LN and HN conditions. The GDH activity in OM052 was significantly high than that in HHZ under HN condition. Metabolic analyses showed that 136 and 142 differentially accumulating metabolites were identified between OM052 and HHZ under LN and HN conditions, respectively. KEGG analysis showed that ‘aminoacyl-tRNA biosynthesis’ was also the most significant enriched in LN_OM052 vs. LN_ HHZ and ‘Glyoxylate and dicarboxylate metabolism’ and ‘citrate cycle’ were the most significantly enriched in HN_OM052 vs. HN_ HHZ. The contents of four metabolites (cis-aconitate, isocitrate, fumarate, and malate) involved in the TCA cycle were significantly upregulated in HN condition compared with LN condition, regardless of OM052 and HHZ. Taken together, the results of our study revealed the physiological and metabolic differences underlying the OM052 and HHZ and provide new insights into coordinating C and N metabolism and improving the NUE of rice.
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