Effects of biochar amendment on rice growth and nitrogen retention in a waterlogged paddy field

Short-term effects of wheat straw incorporation into paddy field include stimulation of CH4 emissions, immobilisation of available N, suppression of rice growth, and accumulation of toxic materials. To study these short-term effects as affected by timing of rice transplantation, a field experiment was conducted at Dapu, China, in 2005. Two levels of wheat straw (0 and 3.75 t/ha) and 2 rice-transplanting times (normal and delayed) were adopted in this experiment. Methane emissions, concentrations of soil mineral N, dry matter accumulations, and grain yields were measured. Delayed rice transplantation had no effect on total CH4 emission from paddy fields incorporated with wheat straw (P > 0.05), but a significant effect on mineralisation of N (P < 0.05), in contrast to the net N immobilisation in the fields where seedlings were transplanted on the normal date. In paddy fields incorporated with wheat straw, delayed transplantation tended to promote rice growth and increase grain yield compared with transplantation on the normal date.

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Biochar amendment mitigated N2O emissions from paddy field during the wheat growing season

Environmental Pollution ◽

10.1016/j.envpol.2021.117026 ◽

2021 ◽

Vol 281 ◽

pp. 117026

Author(s):

Qianqian Zhang ◽

Zhen Wu ◽

Xi Zhang ◽

Pengpeng Duan ◽

Haojie Shen ◽

...

Keyword(s):

Paddy Field ◽

Growing Season ◽

N2o Emissions ◽

Biochar Amendment

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Effect of Biochar Amendment on Methane Emissions from Paddy Field under Water-Saving Irrigation

Sustainability ◽

10.3390/su10051371 ◽

2018 ◽

Vol 10 (5) ◽

pp. 1371 ◽

Cited By ~ 6

Author(s):

Yanan Xiao ◽

Shihong Yang ◽

Junzeng Xu ◽

Jie Ding ◽

Xiao Sun ◽

...

Keyword(s):

Paddy Field ◽

Methane Emissions ◽

Water Saving ◽

Biochar Amendment

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Effects of the Autumn Incorporation of Rice Straw and Application of Lime Nitrogen on Methane and Nitrous Oxide Emissions and Rice Growth of a High-Yielding Paddy Field in a Cool-Temperate Region in Japan

Agriculture ◽

10.3390/agriculture11121298 ◽

2021 ◽

Vol 11 (12) ◽

pp. 1298

Author(s):

Fumiaki Takakai ◽

Mimori Goto ◽

Haruki Watanabe ◽

Keiko Hatakeyama ◽

Kentaro Yasuda ◽

...

Keyword(s):

Rice Straw ◽

Paddy Field ◽

N2o Emission ◽

Nitrous Oxide Emissions ◽

Nitrogen Application ◽

Straw Decomposition ◽

Ch4 Emissions ◽

Rice Growth ◽

Ch4 And N2o ◽

Set Up

The effects of autumn plowing and lime nitrogen application on rice straw decomposition, CH4 and N2O emission and rice growth in the following year in a high-yielding rice cultivated paddy field were evaluated for two years. The experimental plots were set up, combining different times of rice straw (750 g m−2) incorporation into the soil by plowing (autumn or the following spring), with and without lime nitrogen application in autumn (5 g-N m−2). Autumn plowing promoted the decomposition of rice straw, but the application of lime nitrogen did not show a consistent trend. The soil pH was high (7.3) at the studied site, and the alkaline effect of lime nitrogen may not have been significant. As with straw decomposition, CH4 emissions were suppressed by autumn plowing, and no effect from the lime nitrogen application was observed. It was also suggested that the straw decomposition period may be shorter and the CH4 emissions may be higher in high-yielding cultivars that require a longer ripening period than in normal cultivars. The effect of both treatments on N2O emission was not clear. Both the autumn plowing of rice straw and lime nitrogen application were effective in promoting rice growth and increasing rice yield.

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Mitigating methane emission via annual biochar amendment pyrolyzed with rice straw from the same paddy field

The Science of The Total Environment ◽

10.1016/j.scitotenv.2020.141351 ◽

2020 ◽

Vol 746 ◽

pp. 141351

Author(s):

Qiong Nan ◽

Cheng Wang ◽

Hao Wang ◽

Qianqian Yi ◽

Weixiang Wu

Keyword(s):

Rice Straw ◽

Methane Emission ◽

Paddy Field ◽

Biochar Amendment

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Estimation of rice vegetation coverage from DVI of Landsat 7 and 8 data

Science and Technology Development Journal ◽

10.32508/stdj.v19i2.678 ◽

2016 ◽

Vol 19 (2) ◽

pp. 138-145

Author(s):

Thu Thi Thanh Phan ◽

Rikimaru Atsushi ◽

Kenta Sakata ◽

Kazuyoshi Takahashi ◽

Junki Abe

Keyword(s):

Paddy Field ◽

Vegetation Index ◽

Near Infrared ◽

Digital Camera ◽

Vegetation Coverage ◽

Observation Data ◽

Landsat Images ◽

Rice Varieties ◽

Rice Growth ◽

Landsat 7

Monitoring of rice growth is a requirement for high quality rice production. In addtion to plant height, number stem and rice leaf color, vegetation coverage (VC) which represents for percentage of ground covered by rice plant is also considered as an important index to validate rice growth. Thus, the study is to estimate rice vegetation coverage from difference vegetation index (DVI) calculated from reflectance of near-infrared and red band of Landsat 7 and 8 images. The field observations of the reflectance and the VC were carried out in two paddy rice varieties in 2013. Paddy field reflectance was observed by spectrometer Ocean Optics SD2000. The photos of paddies were taken from the height of 1 m by a digital camera in order to calculate the VC. The reflectances of paddy field corresponding to red and near-infrared bands of Landsat 7 and 8 were calculated from the field observation data. Satellite reflectance was also converted from pixel value of Landsat images. According to the data analysis, VC rapidly increased in two fields and got saturation status (VC>90%) at 65 days after transplanting (DAT) in the early July. DVI was approximately 25% when VC saturated. Additionally, DVI had strong correlation with VC with high determination coefficient (r2 =0.9) when VC was less than 90%. Thus, VC were computed from DVI, calculated from reflectances of Landsat images, using a regression model of VC and DVI. From the result of comparison between the estimated and computed VC, the possibility of estimating VC from DVI calculated from Landsat reflectance is confirmed.

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Effects of Rice Straw Amendment and Nitrogen Fertilization on Rice Growth and Soil Properties in Reclaimed Tidal Paddy Field

Korean Journal of Soil Science and Fertilizer ◽

10.7745/kjssf.2015.48.3.205 ◽

2015 ◽

Vol 48 (3) ◽

pp. 205-212

Author(s):

Sanghun Lee ◽

Hui-Su Bae ◽

Soo-Hwan Lee ◽

Kyeong-Bo Lee ◽

Tae-Hwan Noh ◽

...

Keyword(s):

Soil Properties ◽

Rice Straw ◽

Nitrogen Fertilization ◽

Paddy Field ◽

Rice Growth ◽

Straw Amendment

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Weeding Frequencies Decreased Rice–Weed Competition and Increased Rice N Uptake in Organic Paddy Field

Agronomy ◽

10.3390/agronomy11101904 ◽

2021 ◽

Vol 11 (10) ◽

pp. 1904

Author(s):

Margi Asih Maimunah ◽

Valensi Kautsar ◽

Putu Oki Bimantara ◽

Samuel Munyaka Kimani ◽

Ren Torita ◽

...

Keyword(s):

Paddy Field ◽

Rice Field ◽

N Uptake ◽

Tiller Number ◽

Weed Competition ◽

Weed Biomass ◽

Organic Rice ◽

Rice Growth ◽

N Concentration ◽

Weed Diversity

Different weeding frequencies (WFs)―0WF, 2WF, 4WF, 6WF, and 8WF―were adopted in an organic rice field to investigate their influence on weed types, rice and weed biomass, rice tiller and weed number, N concentration, and N uptake. The study field was located in Tsuruoka, Yamagata, Japan. Rice (cv. Sasanishiki) was planted from May to September 2019, and all weeding events were carried out until 49 days after transplantation (DAT) using a rotary weeder. Rice and weed samples were collected at 60, 88, and 110 DAT. Echinochloa crus-galli (E. crus-galli), Schoenoplectus juncoides, and Monochoria vaginalis (Burm. f.) were the most commonly found weeds. High weed diversity was observed at both 6WF and 8WF, E. crus-galli was the dominant weed at 0WF. Compared to 0WF, 2WF displayed a significantly decreased weed biomass. However, at 8WF, the weed biomass was reduced by 79.0%, the rice biomass was increased by 277%, and the rice tiller number was almost three times higher than that at 0WF and 110 DAT. Compared to 0WF, a significantly increased rice N uptake was observed at 4WF, and rice N uptakes achieved at 6WF and 8WF were two and four times higher than those at 0WF, respectively. Higher weeding frequencies provide notable benefits in suppressing weeds and supporting rice growth, especially in N uptake competition with weeds.

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