Nitrogen Fertilizer Management for Enhancing Crop Productivity and Nitrogen Use Efficiency in a Rice-Oilseed Rape Rotation System in China

Abstract Background The use of biochar-based N fertilizers have been considered among the most effective strategy for reducing nitrogen loss and improving nitrogen use efficiency (NUE). However, effect and mechanism of biochar-coated urea (BCU) controlling the loss of nitrogen from soil and NUE are rarely reported. Methodology In this study, a 65-d culture pot experiment of oilseed rape was used to investigate the impact of BCU on nitrogen leaching, ammonia volatilization, soil nitrogen concentrations, soil pH, nitrogen uptake, NUE and oilseed rape biomass as compared with urea and urea combined with biochar at same nitrogen level. Results Results showed that the application of BCU could minimize nitrogen loss mainly by reducing nitrate leaching loss; which could be attributed to the slow-release performance of BCU, followed by biochar induced adsorption/fixation of nitrogen due to the porous nature and surface functional groups of biochar. However, the application of BCU enhanced ammonia volatilization due to the increase of soil NH4+–N concentration and pH value of microenvironment around urea by BCU. The application of BCU increased NUE by about 20% when compared with urea, since BCU reduced losses of nitrogen fertilizer and increased concentration of nitrogen in the soil as well as nitrogen uptake in oilseed rape. Furthermore, the reduction of nitrogen application by 20% when BCU served as a nitrogen source not only reduced nitrogen loss but significantly improved NUE, with no negative effect on the biomass of oilseed rape. Conclusion BCU can serve as a promising control release nitrogen fertilizer for reducing loss of nitrogen and increasing NUE. However further investigations are required to validate the dosage-effect relationship of BCU on crop yield at the field scale.

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Engineering nitrogen use efficiency with alanine aminotransferase

Canadian Journal of Botany ◽

10.1139/b07-019 ◽

2007 ◽

Vol 85 (3) ◽

pp. 252-262 ◽

Cited By ~ 151

Author(s):

Allen G. Good ◽

Susan J. Johnson ◽

Mary De Pauw ◽

Rebecka T. Carroll ◽

Nic Savidov ◽

...

Keyword(s):

Transgenic Plants ◽

Seed Yield ◽

Nitrogen Use Efficiency ◽

Nitrogen Fertilizer ◽

Alanine Aminotransferase ◽

Crop Productivity ◽

Wild Type ◽

Nitrogen Use ◽

Use Efficiency ◽

N Use

Nitrogen (N) is the most important factor limiting crop productivity worldwide. The ability of plants to acquire N from applied fertilizers is one of the critical steps limiting the efficient use of nitrogen. To improve N use efficiency, genetically modified plants that overexpress alanine aminotransferase (AlaAT) were engineered by introducing a barley AlaAT cDNA driven by a canola root specific promoter (btg26). Compared with wild-type canola, transgenic plants had increased biomass and seed yield both in the laboratory and field under low N conditions, whereas no differences were observed under high N. The transgenics also had increased nitrate influx. These changes resulted in a 40% decrease in the amount of applied nitrogen fertilizer required under field conditions to achieve yields equivalent to wild-type plants.

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Interaction of erect panicle genotype and nitrogen fertilizer application on the source-sink ratio and nitrogen use efficiency in rice

Field Crops Research ◽

10.1016/j.fcr.2022.108430 ◽

2022 ◽

Vol 278 ◽

pp. 108430

Author(s):

Olusegun Idowu ◽

Yuanzheng Wang ◽

Koki Homma ◽

Tetsuya Nakazaki ◽

Zhengjin Xu ◽

...

Keyword(s):

Nitrogen Use Efficiency ◽

Nitrogen Fertilizer ◽

Fertilizer Application ◽

Nitrogen Use ◽

Use Efficiency ◽

Source Sink

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Exploiting Genetic Variability of Root Morphology as a Lever to Improve Nitrogen Use Efficiency in Oilseed Rape

Engineering Nitrogen Utilization in Crop Plants ◽

10.1007/978-3-319-92958-3_11 ◽

2018 ◽

pp. 185-206

Author(s):

Julien Louvieaux ◽

Hugues De Gernier ◽

Christian Hermans

Keyword(s):

Genetic Variability ◽

Oilseed Rape ◽

Nitrogen Use Efficiency ◽

Root Morphology ◽

Nitrogen Use ◽

Use Efficiency

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Optimized split nitrogen fertilizer increase photosynthesis, grain yield, nitrogen use efficiency and water use efficiency under water-saving irrigation

Scientific Reports ◽

10.1038/s41598-020-75388-9 ◽

2020 ◽

Vol 10 (1) ◽

Author(s):

Zhen Zhang ◽

Yongli Zhang ◽

Yu Shi ◽

Zhenwen Yu

Keyword(s):

Winter Wheat ◽

Grain Yield ◽

Water Use Efficiency ◽

Water Use ◽

Nitrogen Use Efficiency ◽

Nitrogen Fertilizer ◽

Water Saving ◽

Nitrogen Use ◽

Use Efficiency ◽

Nitrogen Ratio

AbstractThis study aims to investigate optimization of the basal-top-dressing nitrogen ratio for improving winter wheat grain yield, nitrogen use efficiency, water use efficiency and physiological parameters under supplemental irrigation. A water-saving irrigation (SI) regime was established and sufficient irrigation (UI) was used as a control condition. The split-nitrogen regimes used were based on a identical total nitrogen application rate of 240 kg ha−1 but were split in four different proportions between sowing and the jointing stage; i.e. 10:0 (N1), 7:3 (N2), 5:5 (N3) and 3:7 (N4). Compared with the N1, N2 and N4 treatments, N3 treatment increased grain yield, nitrogen and water use efficiencies by 5.27–17.75%, 5.68–18.78% and 5.65–31.02%, respectively, in both years. The yield advantage obtained with the optimized split-nitrogen fertilizer application may be attributable to greater flag leaf photosynthetic capacity and grain-filling capacity. Furthermore, the N3 treatment maintained the highest nitrogen and water use efficiencies. Moreover, we observed that water use efficiency of SI compared with UI increased by 9.75% in 2016 and 10.79% in 2017, respectively. It can be concluded that SI along with a 5:5 basal-top-dressing nitrogen ratio should be considered as an optimal fertigation strategy for both high grain yield and efficiency in winter wheat.

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