Effects of Water–Nitrogen Interaction Coupled with Straw Addition on Rice Paddy Field Grain Yield and Greenhouse Gas Emissions

Wu, Meikang; Su, Qingwang; Song, Zehe; Jiang, Hao; Li, Yunzhe; Wei, Xiaoshuang; Cui, Jingjing; Yang, Meiying; Wu, Zhihai

doi:10.1007/s42106-022-00185-5

Cited by 4 publications

(2 citation statements)

References 25 publications

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“…Nitrous oxide gas (N 2 O) was collected and measured during the wolfberry harvest period using a closed static camera obscuru gas chromatography ( Wu et al., 2022a ).…”

Section: Methodsmentioning

confidence: 99%

Investigation of the regulatory effects of water and nitrogen supply on nitrogen transport and distribution in wolfberry fields

Tian,

Wang,

Yin

et al. 2024

Front. Plant Sci.

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Resource-based water shortages, uncoordinated irrigation, and fertilization are prevalent challenges in agricultural production. The scientific selection of appropriate water and fertilizer management methods is important for improving the utilization efficiency of agricultural resources and alleviating agricultural non-point source pollution. This study focused on wolfberry and compared the effects of four irrigation levels [full irrigation (W0, 75%–85% θf), slight water deficit (W1, 65%–75% θf), moderate water deficit (W2, 55%–65% θf), and severe water deficit (W3, 45%–55% θf)] and four nitrogen application levels [no nitrogen application (N0, 0 kg·ha−1), low nitrogen application (N1, 150 kg·ha−1), medium nitrogen application (N2, 300 kg·ha−1), and high nitrogen application (N3, 450 kg·ha−1)] on soil nitrate nitrogen (NO3−–N) transport, plant nitrogen allocation, and soil nitrous oxide (N2O) emissions during the harvest period of wolfberry. And this study used CRITIC-entropy weights-TOPSIS model to evaluate 16 water and nitrogen regulation models comprehensively. The results revealed the following: (1) The NO3−–N content of the soil decreased with increasing horizontal distance from the wolfberry. It initially decreased, then increased, and finally decreased with an increase in soil depth. The average NO3−–N content in the 0–100 cm soil layer ranged from 3.95–13.29 mg·kg−1, indicating that W0 > W1, W2, W3, and N3 > N2 > N1 > N0. (2) The soil NO3−–N accumulation ranged from 64.45–215.27 kg·ha−1 under varying water and nitrogen levels, demonstrating a decreasing trend with increasing horizontal distance. The NO3−–N accumulation at each horizontal distance increased with increasing irrigation and nitrogen application. The NO3−–N accumulation of W0N3 treatment increased by 5.55%–57.60% compared with the other treatments. (3) The total nitrogen content and nitrogen uptake in all wolfberry organs were W1 > W0 > W2 > W3, and N2 > N3 > N1 > N0. The maximum total nitrogen content and nitrogen uptake in W1N2 treatment were 3.25% and 27.82 kg·ha−1 in the roots, 3.30% and 57.19 kg·ha−1 in the stems, 3.91% and 11.88 kg·ha−1 in the leaves, and 2.42% and 63.56 kg·ha−1 in the fruits, respectively. (4) The emission flux and total emission of N2O increased with increasing irrigation and nitrogen application. The emission flux exhibited a transient peak (116.39–177.91 ug·m−2·h−1) after irrigation. The intensity of N2O emissions initially decreased and then increased with an increase in the irrigation amount. It also initially increased with increasing nitrogen application amount, then decreased, and finally increased again. The maximum emission intensity was observed under the W3N3 treatment (0.23 kg·kg−1). The N2O emission coefficients ranged from 0.17%–0.39%, in the order of W0 > W1 > W2 > W3 (except for N1) and N1 > N2 > N3. (5) Under varying water and nitrogen concentrations, N2O emission flux showed a positive linear correlation with soil pore water content and NO3−–N content and a negative linear correlation with soil temperature. The comprehensive evaluation revealed that a slight water deficit (65%–75% θf) combined with medium nitrogen application (300 kg·ha−1) decreased soil NO3−–N leaching, increased nitrogen uptake, and reduced N2O emission. These findings can serve as a reference for improving the efficiency and reducing emissions of wolfberry in the Yellow River irrigation region of Gansu Province and in similar climate zones.

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“…Nitrous oxide gas (N 2 O) was collected and measured during the wolfberry harvest period using a closed static camera obscuru gas chromatography ( Wu et al., 2022a ).…”

Section: Methodsmentioning

confidence: 99%

Investigation of the regulatory effects of water and nitrogen supply on nitrogen transport and distribution in wolfberry fields

Tian,

Wang,

Yin

et al. 2024

Front. Plant Sci.

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“…In Chinese rice production, panicle fertilizer is usually applied in two splits, one at the PI stage and the other at the SPD stage ( Wu et al., 2022 ). Jiangsu Province is a prominent rice-producing region in the middle and lower reaches of the Yangtze River in China, currently the country’s largest and most concentrated area under rice–wheat rotation, with abundant straw resources to return ( Li et al., 2017 ).…”

Section: Introductionmentioning

confidence: 99%

Simplified panicle fertilization is applicable to japonica cultivars, but splits are preferred in indica rice for a higher paddy yield under wheat straw return

Shu,

Zhang,

Wang

et al. 2024

Front. Plant Sci.

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IntroductionThe panicle fertilization strategy for japonica and indica rice under wheat straw return (SR) has not been updated, especially on the elaboration of their impacts on spikelet differentiation and degeneration. This study aimed to verify the hypothesis that SR increases spikelet number by reducing spikelet degeneration and to explore the possibility of simplifying panicle fertilization.MethodsIn three consecutive years, four varieties of japonica and indica rice were field-grown in Yangzhou, Jiangsu Province, China. Six panicle fertilization rates and split treatments were applied to SR and no straw return (NR) conditions.ResultsThe results showed that SR promoted rice yield significantly by 3.77%, and the highest yields were obtained under the T2 (split panicle fertilization at the panicle initiation (PI) and spikelet primordium differentiation (SPD) stages) and T1 (panicle fertilization only at the PI stage) treatments, for indica and japonica rice, respectively. Correlation and path analysis revealed that the number of spikelets per panicle was the most attributable to yield variation. SR significantly increased the concentration of alkali hydrolyzable N in the soil 40 days after rice transplantation, significantly increased the nitrogen accumulation per stem (NA) during the SPD-pollen mother cell meiosis (PMC) stage, and increased the brassinosteroids level in the young panicles at the PMC stage. SR also reduced the degeneration rate of spikelets (DRS) and increased the number of surviving spikelets (NSS). The dry matter accumulation per stem was more important to increasing the NA in japonica rice at the PMC stage, whereas NA was more affected by the N content than the dry matter accumulation in indica rice. In japonica rice, panicle N application once only at the PI stage combined with the N released from SR was enough to improve the plant N content, reduce the DRS, and increase the NSS. For indica rice, split application of N panicle fertilization at both the PI and SPD stages was still necessary to achieve a maximum NSS.DiscussionIn conclusion, under wheat SR practice, panicle fertilization could be simplified to once in japonica rice with a significant yield increase, whereas equal splits might still be optimal for indica rice.

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Rice Yield and Greenhouse Gas Emissions Due to Biochar and Straw Application under Optimal Reduced N Fertilizers in a Double Season Rice Cropping System

Hua

Zhou

et al. 2023

Agronomy

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This study aimed to investigate the impacts of straw and biochar on greenhouse gas (GHG) emissions and grain yield in a double rice cropping system under optimal N fertilizer reduction. Conventional fertilization (CF) was used as the control group, and treatments included optimal fertilization and 15% less nitrogen (OF), together with straw (S) or biochar (B) applied under different fertilization conditions, namely CF + S, CF + B, OF + S, and OF + B. The effects of treatments on soil CH4 and N2O emissions were studied, and changes in soil physicochemical properties were analyzed. The results showed that relative to CF, CF + S and OF + S increased the cumulative CH4 emissions by 11.80% and 2.35%, respectively, while CF + B and OF + B resulted in significant reductions in cumulative CH4 emissions by 27.80% and 28.46%, respectively. Biochar was effective in reducing N2O emissions, and OF further increased the potential, with CF + B and OF + B achieving the best N2O reductions of 30.56% and 32.21%, respectively. Although OF reduced yields by 0.16%, this difference was within reasonable limits; the remaining treatments increased grain yields by 2.55% to 3.47%. CF + B and OF + B reduced the global warming potential (GWP) by 27.93% and 28.63%, respectively, and ultimately reduced the greenhouse gas emission intensity (GHGI) by 30.42% and 30.97%. Both straw and biochar increased the soil organic matter, NH4+-N, and NO3−-N contents, and biochar increased the soil pH, which may be the potential mechanism regulating soil GHG emissions. Overall, OF + B is beneficial for reducing GHG emissions and may be a better agronomic cropping pattern in double season rice growing areas.

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Effects of Water–Nitrogen Interaction Coupled with Straw Addition on Rice Paddy Field Grain Yield and Greenhouse Gas Emissions

Cited by 4 publications

References 25 publications

Investigation of the regulatory effects of water and nitrogen supply on nitrogen transport and distribution in wolfberry fields

Investigation of the regulatory effects of water and nitrogen supply on nitrogen transport and distribution in wolfberry fields

Simplified panicle fertilization is applicable to japonica cultivars, but splits are preferred in indica rice for a higher paddy yield under wheat straw return

Rice Yield and Greenhouse Gas Emissions Due to Biochar and Straw Application under Optimal Reduced N Fertilizers in a Double Season Rice Cropping System

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