scholarly journals Nitrogen fertilizer fate after introducing maize and upland-rice into continuous paddy rice cropping systems

2018 ◽  
Vol 258 ◽  
pp. 162-171 ◽  
Author(s):  
Irabella Fuhrmann ◽  
Yao He ◽  
Eva Lehndorff ◽  
Nicolas Brüggemann ◽  
Wulf Amelung ◽  
...  
Keyword(s):  
Nitrogen Fertilizer ◽  
Upland Rice ◽  
Cropping Systems ◽  
Paddy Rice ◽  
Rice Cropping Systems

scholarly journals Mapping Ratoon Rice Planting Area in Central China Using Sentinel-2 Time Stacks and the Phenology-Based Algorithm

2020 ◽  
Vol 12 (20) ◽  
pp. 3400
Author(s):  
Shishi Liu ◽  
Yuren Chen ◽  
Yintao Ma ◽  
Xiaoxuan Kong ◽  
Xinyu Zhang ◽  
...  
Keyword(s):  
Vegetation Index ◽  
Cropping Systems ◽  
Hubei Province ◽  
Paddy Rice ◽  
Rice Fields ◽  
Central China ◽  
Yellowness Index ◽  
Productivity Cost ◽  
Rice Cropping Systems ◽  
Sentinel 2

Mapping rice cropping systems is important for grain yield prediction and food security assessments. Both single- and double-season rice are the dominant rice systems in central China. However, because of increasing labor shortages and high costs, there has been a gradual decline in double-season rice. Ratoon rice (RR) has been proposed as an alternative system that balances the productivity, cost, and labor requirements of rice cultivation. RR has been expanding in central China, encouraged by the improved cultivars, machinery, and favorable policies. However, to our knowledge, the distribution of RR has not been mapped with remote sensing techniques. This study developed a phenology-based algorithm to map RR at a 10 m resolution in Hubei Province, Central China, using dense time stacks of Sentinel-2 images (cloud cover <80%) in 2018. The key in differentiating RR from the other rice cropping systems is through the timing of maturity. We proposed to use two contrast vegetation indices to identify RR fields. The newly-developed yellowness index (YI) calculated with the reflectance of blue, green, and red bands was used to detect the ripening phase, and the enhanced vegetation index (EVI) was used to detect the green-up of the second-season crop to eliminate the misclassification caused by stubbles left in the field. The RR map demonstrated that RR was mainly distributed in the low alluvial plains of central and southern Hubei Province. The total planting area of RR in 2018 was 2225.4 km2, accounting for 10.03% of the total area of paddy rice fields. The overall accuracy of RR, non-RR rice fields, and non-rice land cover types was 0.76. The adjusted overall accuracy for RR and non-RR was 0.91, indicating that the proposed YI and the phenology-based algorithm could accurately identify RR fields from the paddy rice fields.

Long-term Productivity of Intensive Rice Cropping Systems on the Central Plain of Thailand

1977 ◽  
Vol 13 (4) ◽  
pp. 305-315 ◽  
Author(s):  
J. J. Walcott ◽  
M. Chauviroj ◽  
A. Chinchest ◽  
P. Choticheuy ◽  
R. Ferraris ◽  
...  
Keyword(s):  
Grain Yield ◽  
Short Duration ◽  
Nitrogen Uptake ◽  
Nitrogen Fertilizer ◽  
Dry Matter ◽  
Cropping Systems ◽  
Dry Season ◽  
Multiple Cropping ◽  
Rice Cropping Systems

SUMMARYThe productivity of seven multiple rice-cropping systems, utilizing a short-duration cultivar under irrigation, were assessed over 5 years. Systems of one, two and three crops a year were compared. Multiple cropping reduced grain yield, panicles m-2, total dry matter and nitrogen uptake per crop. However, the unfertilized three-crop-per-year system averaged 9·1 t grain, 17·1 t DM and 126 kg N ha-1 per annum, without showing a long term decline in productivity. Recovery and utilization of nitrogen fertilizer were generally low compared to other experiments, and were highest for the early dry season cropping period.

scholarly journals Cost-Benefit Analysis for Single and Double Rice Cropping Systems under the Background of Global Warming

Atmosphere ◽  
2020 ◽  
Vol 11 (10) ◽  
pp. 1048
Author(s):  
Qing Ye ◽  
Xiaoguang Yang ◽  
Yong Li ◽  
Wanghua Huang ◽  
Wenjuan Xie ◽  
...  
Keyword(s):  
Global Warming ◽  
Climate Variability ◽  
Nitrogen Fertilizer ◽  
Yangtze River ◽  
Cropping Systems ◽  
The Yangtze River ◽  
Net Profit ◽  
Use Efficiency ◽  
Double Rice ◽  
Rice Cropping Systems

Global warming might expand crop growth areas for the prevailing single and double rice cropping systems in Southern China. Based on historical weather and crop data from 1981 to 2015, we evaluated the economic benefit and environmental cost for single and double rice cropping systems (SRCS and DRCS) in areas that are sensitive to climate variability in the middle and lower reaches of the Yangtze River. The five chosen indices were: net profit, agronomic nitrogen use efficiency (ANUE), water use efficiency (WUE), total amount, and global warming potential (GWP) of greenhouse gas (GHG). The goal of this study is to provide scientific evidence for local policymakers to use in selecting the most suitable rice cropping systems to maximize economic profits while adapting to climate change. The results showed that net profit was $171.4 per hectare higher for DRCS than for SRCS in the study region. In addition, output per unit nitrogen usage was $0.25 per kg N higher for DRCS than for SRCS. Net profit would increase if DRCS replaced SRCS, and the maximum amplitude of increase in net profit for this replacement occurred under the settings of 150 kg ha−1 nitrogen fertilizer level and continuous irrigation when the paddy water layer started to fade. On the other hand, annual variation in net profit for SRCS was consistently smaller than DRCS, regardless of changes in nitrogen fertilizer level and irrigation regime settings. SRCS showed better WUE than DRCS in both rainfed and irrigated situations, as well as lower seasonal CH4 and N2O emissions during the study period. Therefore, we conclude that SRCS is superior to DRCS for the sake of maximizing economic profit while maintaining sustainable agriculture in areas that are sensitive to climate variability in the middle and lower reaches of the Yangtze River.

scholarly journals Impact of trap barrier systems on rodent damage to upland rice cropping systems during bamboo masting events

2019 ◽  
Vol 126 ◽  
pp. 104939
Author(s):  
Nikhil Chakma ◽  
Noor Jahan Sarker ◽  
Sohrab Uddin Sarker ◽  
Santosh Kumar Sarker ◽  
Rokeya Begum Shafali ◽  
...  
Keyword(s):  
Upland Rice ◽  
Cropping Systems ◽  
Rice Cropping Systems

scholarly journals Earthworm Inoculation Improves Upland Rice Crop Yield and Other Agrosystem Services in Madagascar

Agriculture ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 60
Author(s):  
Onja Ratsiatosika ◽  
Malalatiana Razafindrakoto ◽  
Tantely Razafimbelo ◽  
Michel Rabenarivo ◽  
Thierry Becquer ◽  
...  
Keyword(s):  
Upland Rice ◽  
Cropping Systems ◽  
Conservation Agriculture ◽  
Biological Properties ◽  
Rice Grain ◽  
Positive Effects ◽  
Ecological Transition ◽  
Earthworm Activity ◽  
Endogeic Earthworms ◽  
Plant Properties

The effects of earthworm inoculation and cropping systems on upland rice systems were examined over a four-year period in the Highlands of Madagascar. Each year, endogeic earthworms Pontoscolex corethrurus (Rhinodrilidae) were inoculated (EW+) at a density of 75 ind m−2 or were not inoculated (EW0). Inoculation was tested in three cropping systems: conservation agriculture (CA) and traditional tillage with or without residues restitution. Soil and plant properties were measured during the first three years while soil biological properties were assessed at the fourth year. At the end of the experiment, earthworm density was three-fold higher in EW+ than in EW0, demonstrating the success of the inoculation. Earthworm density was more important in CA than in tillage systems. Earthworm inoculation had higher significant effects on soil and plant properties than cropping systems. Earthworm inoculation had positive effects on soil macroaggregation (+43%), aboveground biomass (+27%), rice grain yield (+45%), and N grain amount (+43%). Intensifying earthworm activity in field conditions to meet the challenge of ecological transition is supported by our study.

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