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Chaoqiang Jiang, Dianjun Lu, Chaolong Zu, Jianmin Zhou, Huoyan Wang
It is urgently to minimize nitrogen (N) loss while simultaneously ensuring high yield for maize in China. A two-year field experiment was conducted to determine the effects of root-zone fertilization (RZF) and split-surface broadcasting (SSB) on grain yield, N use efficiency (NUE), and urea-15 N fate under different N rates (135, 180 and 225 kg ha-1 ). Results showed that RZF increased grain yield by 11.5%, and the N derived from fertilizer (Ndff%) by 13.1-19.6%, compared with SSB. The percentage of residual 15 N in the 0-80 cm soil was 37...
October 11, 2018: Scientific Reports
Sumeth Wongkiew, Mee-Rye Park, Kartik Chandran, Samir Kumar Khanal
Aquaponics is a technology for food production (fish and vegetables/fruits) with concomitant remediation of nitrogen-rich aquaculture effluent. There is, however, a critical need to improve the nitrogen use efficiency (NUE) in aquaponics. Here, we employed quantitative polymerase chain reactions and next-generation sequencing to evaluate the bacterial communities and their links to nitrogen transformations for improving NUEs in four bench-scale plant-based floating-raft aquaponics (pak choi, lettuce, chive, and tomato) and three pH levels (7...
September 28, 2018: Environmental Science & Technology
Xiaoli Fan, Wei Zhang, Na Zhang, Mei Chen, Shusong Zheng, Chunhua Zhao, Jie Han, Jiajia Liu, Xilan Zhang, Liqiang Song, Jun Ji, Xigang Liu, Hongqing Ling, Yiping Tong, Fa Cui, Tao Wang, Junming Li
QTL for a wheat ideotype root system and its plasticity to nitrogen deficiency were characterized. Root system architecture-related traits (RRTs) and their plasticity to nitrogen availability are important for nitrogen acquisition and yield formation in wheat (Triticum aestivum L.). In this study, quantitative trait loci (QTL) analysis was conducted under different nitrogen conditions, using the seedlings of 188 recombinant inbred lines derived from a cross between Kenong 9204 and Jing 411. Fifty-three QTL for seven RRTs and fourteen QTL for the plasticity of these RRTs to nitrogen deficiency were detected...
September 25, 2018: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
Xiukang Wang, Ning Wang, Yingying Xing, Mohamed Ben El Caid
Nitrogen (N) fertilization potentially affects the amount of N uptake and N translocation (NT) within plants, but the synergetic effects of plastic mulching and N application rates on the grain yield (GY), N uptake and NT of maize have not been studied. A fertilization experiment with six N application rates (0, 80, 160, 240, 350 and 450 kg ha-1 ) with or without mulch was conducted in 2015 and 2016 in the Loess Plateau of China. There were significant interactions between mulch and the N fertilizer rate on the GY...
September 25, 2018: Scientific Reports
Muhammad Waqas, Shizhong Feng, Hira Amjad, Puleng Letuma, Wenshan Zhan, Zhong Li, Changxun Fang, Yasir Arafat, Muhammad Umar Khan, Muhammad Tayyab, Wenxiong Lin
Nitrogen (N) is an essential element usually limiting in plant growth and a basic factor for increasing the input cost in agriculture. To ensure the food security and environmental sustainability it is urgently required to manage the N fertilizer. The identification or development of genotypes with high nitrogen utilization efficiency (NUE) which can grow efficiently and sustain yield in low N conditions is a possible solution. In this study, two isogenic rice genotypes i.e., wild-type rice kitaake and its transgenic line PP2C9TL overexpressed protein phosphatase gene ( PP2C9 ) were used for comparative proteomics analysis at control and low level of N to identify specific proteins and encoding genes related to high NUE...
September 19, 2018: International Journal of Molecular Sciences
Yingke Fang, Xinhan Chen, Zhen Hu, Daoxing Liu, Hang Gao, Lichao Nie
The effects of hydraulic retention time (HRT) on the performance of algal-bacterial-based aquaponics (AA) were investigated in this study. Both the highest fish growth and algal biomass increase were observed in the AA system at 2-day HRT, resulting in the highest nitrogen utilization efficiency (NUE) (39.28%) in this microcosm. On the contrary, ammonia oxidation bacteria (AOB) abundance at 4-day HRT was approximately ten times higher than that at 2-day HRT, since longer HRT would benefit bacterial growth. The 15 N labeling study showed that microalgae assimilation was the main pathway of NH4 + removal in the AA system, and oxygen produced by microalgae could in situ support complete nitrification, thus leading to much lower NH4 + concentrations at 2-day HRT...
September 6, 2018: Applied Microbiology and Biotechnology
Jin Peng Chu, Wen Mei Zhu, Li Jun Yin, Yu Hua Shi, Shu Zhen Deng, Liang Zhang, Ming Rong He, Xing Long Dai
The effects of wide-range planting (WR) versus drilling-planting (DP) on grain yield, nitrogen use efficiency (NUE), and nitrogen uptake efficiency (UPE) were investigated using winter wheat cultivar Tainong 18 at experimental fields in Tai'an and Yanzhou during the growing seasons of 2015 and 2016. The results showed that planting pattern, experimental field location, and their interaction significantly affected the grain yield, NUE, and related indices of cultivar Tainong 18. Compared to DP, the WR pattern significantly increased grain yield by 22...
August 2018: Ying Yong Sheng Tai Xue Bao, the Journal of Applied Ecology
Hongxiang Zhang, Yingzhi Gao, Buli Yohannis Tasisa, Jerry M Baskin, Carol C Baskin, Xiao-Tao Lü, Daowei Zhou
Water and nitrogen (N) availability to plants are spatially and temporally variable in arid and semi-arid grasslands. We aimed to investigate the eco-physiological responses of three bunchgrass species to water and N addition along a gradient of habitat degradation in the Inner Mongolian typical grasslands. The effects of water and N addition on aboveground and belowground growth and biomass allocation and water- and nitrogen-use efficiency (WUE and NUE) of Stipa grandis, Agropyron cristatum and Cleistogenes squarrosa from non-degraded, moderately-degraded and heavily-degraded grasslands, respectively, were compared...
January 10, 2019: Science of the Total Environment
Yuan Yi, Fujian Li, Mingwei Zhang, Yi Yuan, Min Zhu, Wenshan Guo, Xinkai Zhu, Chunyan Li
Excessive use of synthetic nitrogen (N) fertilizer and lower nitrogen use efficiency (NUE) are threatening the wheat production in the middle and lower reaches of Yangtze River. Excess input of N fertilizers also results in severe environmental pollution, climate change and biodiversity loss. However, the study on reasonable nitrogen application and NUE improvement with the prerequisite of stable and high yield remains unexplored. In our study, the four different levels of nitrogen were applied to find out the nitrogen threshold which could be both friendly to environment and promise the stable and high yield...
2018: PloS One
Zhipeng Liu, Yingjia Zhao, Xiaoying Wang, Mengya Yang, Chengjin Guo, Kai Xiao
BACKGROUND: Nitrate (NO3 - ) is the major source of nitrogen (N) for higher plants aside from its function in transducing the N signaling. Improving N use efficiency of crops has been an effective strategy for promotion of the sustainable agriculture worldwide. The regulatory pathways associating with N uptake and the corresponding biochemical processes impact largely on plant N starvation tolerance. Thus, exploration of the molecular mechanism underlying nitrogen use efficiency (NUE) and the gene wealth will pave a way for molecular breeding of N starvation-tolerant crop cultivars...
August 13, 2018: BMC Plant Biology
Niels West, Martin Nue Møller, Søren Hansen, Per Cayé-Thomasen
OBJECTIVES: The aim of the present study was to investigate the relationships between tumor size, hearing, and vestibular outcomes in patients with vestibular schwannomas (VSs). MATERIALS AND METHODS: Adult patients (n=124) with unilateral extrameatal VS prior to surgery were included in the study. This was a retrospective cohort study of preoperative audiovestibular investigations including audiometry, discrimination test, caloric test, cervical vestibular evoked myogenic potential (c-VEMP), and ocular vestibular evoked myogenic potential (o-VEMP)...
August 2018: Journal of International Advanced Otology
A S Nehe, S Misra, E H Murchie, K Chinnathambi, M J Foulkes
Nitrogen (N) fertilizer represents a significant cost for the grower and may also have environmental impacts through nitrate leaching and N2 O (a greenhouse gas) emissions associated with denitrification. The objectives of this study were to quantify the genetic variability in N-use efficiency (NUE) in Indian spring wheat cultivars and identify traits for improved NUE for application in breeding. Twenty eight bread wheat cultivars and two durum wheat cultivars were tested in field experiments in two years in Maharashtra, India...
August 1, 2018: Field Crops Research
Li Wang, Cheng Xue, Xia Pan, Fang Chen, Yi Liu
The use of controlled-release urea (CRU) has been recommended over that of conventional urea to improve rice grain yield and nitrogen use efficiency. However, the underlying agronomical and physiological mechanisms need to be better understood. In this study, field trials over four site-years, and a big container experiment were carried out to explore CRU effects on rice yield and NUE, with the main aims to identify the key yield components contributing to the superior rice yield with CRU use, and to evaluate differences in dry matter, nitrogen (N) accumulation, translocation and yield formation with different N fertilizer practices...
2018: Frontiers in Plant Science
Qianjing Jiang, Zhiming Qi, Chandra A Madramootoo, Cynthia Crézé
Greenhouse gas (GHG) emissions from agricultural soils are affected by various environmental factors and agronomic practices. The impact of inorganic nitrogen (N) fertilization rates and timing, and water table management practices on N2 O and CO2 emissions were investigated to propose mitigation and adaptation efforts based on simulated results founded on field data. Drawing on 2012-2015 data measured on a subsurface-drained corn (Zea mays L.) field in Southern Quebec, the Root Zone Water Quality Model 2 (RZWQM2) was calibrated and validated for the estimation of N2 O and CO2 emissions under free drainage (FD) and controlled drainage with sub-irrigation (CD-SI)...
January 1, 2019: Science of the Total Environment
Chaoqiang Jiang, Dianjun Lu, Chaolong Zu, Jia Shen, Shiji Wang, Zhibin Guo, Jianmin Zhou, Huoyan Wang
Excess N-fertilizer application and inappropriate fertilization methods have led to low N use efficiency (NUE) and high N leaching. A field experiment was performed in a typical lime concretion black soil area to compare N application methods: split surface broadcasting (SSB) and one-time root-zone fertilization (RZF) on grain yield, NUE, the fate of 15 N urea and soil N loss during the 2015 and 2016 maize growing seasons. Each application method was tested at N rates of 135 and 180 kg N ha-1 , and a control (CK) with no N fertilizer...
July 6, 2018: Scientific Reports
Ying-Peng Hua, Ting Zhou, Qiong Liao, Hai-Xing Song, Chun-Yun Guan, Zhen-Hua Zhang
Nitrogen (N) is a non-mineral macronutrient essential for plant growth and development. Oilseed rape (An An Cn Cn , 2 n = 4 x = 38) has a high requirement for N nutrients whereas showing the lowest N use efficiency (NUE) among crops. The mechanisms underlying NUE regulation in Brassica napus remain unclear because of genome complexity. In this study, we performed high-depth and -coverage whole-genome re-sequencing (WGS) of an N-efficient (higher NUE) genotype "XY15" and an N-inefficient (lower NUE) genotype "814" of rapeseed...
July 31, 2018: G3: Genes—Genomes—Genetics
Yanzheng Wu, Yong Li, Xiaoqing Fu, Jianlin Shen, Dan Chen, Yi Wang, Xinliang Liu, Runlin Xiao, Wenxue Wei, Jinshui Wu
Tea (Camellia sinensis L.), a perennial leaf-harvested crop, favors warm/humid climate and acidic/well-drained soils, and demands high nitrogen (N) fertilizer inputs which lead to significant emissions of N2 O. Potential mitigation options should be adopted to improve N use efficiency (NUE) and reduce environmental pollution in tea field system. A 3-year field experiment was carried out in a tea field in southern China from January 2014 to December 2016 to investigate the effect of controlled-release fertilizer (CRF) application on N2 O emissions in tea field system...
September 2018: Environmental Science and Pollution Research International
Lívia Gomes Torres, Mateus Cupertino Rodrigues, Nathan Lamounier Lima, Tatiane Freitas Horta Trindade, Fabyano Fonseca E Silva, Camila Ferreira Azevedo, Rodrigo Oliveira DeLima
Identifying maize inbred lines that are more efficient in nitrogen (N) use is an important strategy and a necessity in the context of environmental and economic impacts attributed to the excessive N fertilization. N-uptake efficiency (NUpE) and N-utilization efficiency (NUtE) are components of N-use efficiency (NUE). Despite the most maize breeding data have a multi-trait structure, they are often analyzed under a single-trait framework. We aimed to estimate the genetic parameters for NUpE and NUtE in contrasting N levels, in order to identify superior maize inbred lines, and to propose a Bayesian multi-trait multi-environment (MTME) model...
2018: PloS One
Alemayehu Kidane, Margareth Øverland, Liv Torunn Mydland, Egil Prestløkken
We assessed the interactive effects of gross feed use efficiency (FUE, milk yield per kg DMI) background ("high" = HEFF vs. "low" = LEFF) and graded levels of dietary CP (130, 145, 160 and 175 g/kg DM) on milk production, enteric methane (CH4) emission and apparent nitrogen use efficiency (NUE, g milk protein nitrogen per g nitrogen intake) with Nowegian Red (NRF) dairy cows. Eight early- to mid-lactation cows were used in a 4x4 Latin square design experiment (2 efficiency backgrounds, 4 dietary treatments and 4 periods each lasting 28 d)...
June 26, 2018: Journal of Animal Science
Jinpeng Li, Xuexin Xu, Gang Lin, Yunqi Wang, Yang Liu, Meng Zhang, Jinyao Zhou, Zhimin Wang, Yinghua Zhang
Water use efficiency (WUE) and nitrogen fertilizer use efficiency (NUE) of winter wheat are urgently needed to further improve in the North China Plain (NCP). In this study, a 3-year field experiment was conducted during the 2014-2017 growing seasons to clarify the effect of traditional flood irrigation (TI), surface drip irrigation (DI), and micro-sprinkling irrigation (MSI) on grain yield, WUE, and NUE of winter wheat. Across the 3 years, grain yield of DI and MSI improved by 9.79% and 14.1%, WUE of DI and MSI increased by 12...
December 1, 2018: Science of the Total Environment
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