Water‐use efficiency and greenhouse gas emissions of rice affected by water saving and nitrogen reduction

This paper proposes an optimization method based on the RAGA model. Taking rice from a cold area as the research object, this article selects irrigation volume, nitrogen application volume, and biochar application volume as experimental factors, and rice yield, water use efficiency, greenhouse gas emission comprehensive warming potential as influencing indicators. The research design is D311 Field trials by 3 factors of 5 levels of saturation. Hence, we can obtain the data on rice yield, water use efficiency, greenhouse gas emissions and comprehensive warming potential under different levels of water and fertilizer, and biochar application, and regression equations were established respectively. The RAGA model was used to simulate the regression equations. The optimal combination of water and fertilizer, and biochar was obtained as follows: irrigation amount is 7230 m3.hm-2, nitrogen fertilizer application amount is 92.13 kg.hm-2, and biochar application amount is 30 t.hm-2. The optimal rice yield obtained under this combination is 9452.20 kg.hm-2. The water use efficiency is 1.94 kg.m-3, and the comprehensive warming potential of greenhouse gas emissions is 4546.73 kg.hm-2. The combined application of water and fertilizer, and biochar optimized by this model can provide a theoretical basis for achieving high yield, water-saving, and emission reduction of rice in cold areas, and it can also provide a reliable calculation method and idea for solving similar optimization problems in the field of agricultural production.

Download Full-text

Algal food and fuel coproduction can mitigate greenhouse gas emissions while improving land and water-use efficiency

Environmental Research Letters ◽

10.1088/1748-9326/11/11/114006 ◽

2016 ◽

Vol 11 (11) ◽

pp. 114006 ◽

Cited By ~ 30

Author(s):

Michael J Walsh ◽

Léda Gerber Van Doren ◽

Deborah L Sills ◽

Ian Archibald ◽

Colin M Beal ◽

...

Keyword(s):

Water Use Efficiency ◽

Greenhouse Gas Emissions ◽

Greenhouse Gas ◽

Water Use ◽

Gas Emissions ◽

Algal Food ◽

Use Efficiency

Download Full-text

Increasing energy and protein use efficiency improves opportunities to decrease land use, water use, and greenhouse gas emissions from dairy production

Agricultural Systems ◽

10.1016/j.agsy.2016.03.013 ◽

2016 ◽

Vol 146 ◽

pp. 20-29 ◽

Cited By ~ 12

Author(s):

Robin R. White

Keyword(s):

Land Use ◽

Greenhouse Gas Emissions ◽

Greenhouse Gas ◽

Water Use ◽

Dairy Production ◽

Gas Emissions ◽

Use Efficiency

Download Full-text

Estimate greenhouse gas emissions from water-saving and drought-resistance rice paddies by deNitrification-deComposition model

Clean Technologies and Environmental Policy ◽

10.1007/s10098-021-02094-z ◽

2021 ◽

Author(s):

Xianxian Zhang ◽

Huifeng Sun ◽

Junguo Bi ◽

Bo Yang ◽

Jining Zhang ◽

...

Keyword(s):

Greenhouse Gas Emissions ◽

Greenhouse Gas ◽

Drought Resistance ◽

Water Saving ◽

Rice Paddies ◽

Gas Emissions ◽

Decomposition Model

Download Full-text

Exploring Northwest China's agricultural water-saving strategy: analysis of water use efficiency based on an SE-DEA model conducted in Xi'an, Shaanxi Province

Water Science & Technology ◽

10.2166/wst.2016.286 ◽

2016 ◽

Vol 74 (5) ◽

pp. 1106-1115 ◽

Cited By ~ 5

Author(s):

L. Mu ◽

L. Fang ◽

H. Wang ◽

L. Chen ◽

Y. Yang ◽

...

Keyword(s):

Water Resources ◽

Water Use Efficiency ◽

Water Use ◽

Water Demand ◽

Water Governance ◽

Northwest China ◽

Water Saving ◽

Shaanxi Province ◽

Agricultural Water ◽

Use Efficiency

Worldwide, water scarcity threatens delivery of water to urban centers. Increasing water use efficiency (WUE) is often recommended to reduce water demand, especially in water-scarce areas. In this paper, agricultural water use efficiency (AWUE) is examined using the super-efficient data envelopment analysis (DEA) approach in Xi'an in Northwest China at a temporal and spatial level. The grey systems analysis technique was then adopted to identify the factors that influenced the efficiency differentials under the shortage of water resources. From the perspective of temporal scales, the AWUE increased year by year during 2004–2012, and the highest (2.05) was obtained in 2009. Additionally, the AWUE was the best in the urban area at the spatial scale. Moreover, the key influencing factors of the AWUE are the financial situations and agricultural water-saving technology. Finally, we identified several knowledge gaps and proposed water-saving strategies for increasing AWUE and reducing its water demand by: (1) improving irrigation practices (timing and amounts) based on compatible water-saving techniques; (2) maximizing regional WUE by managing water resources and allocation at regional scales as well as enhancing coordination among Chinese water governance institutes.

Download Full-text

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.

Download Full-text