scholarly journals Waxy Rice Cultivation by Direct Sowing in a Well-Drained Paddy Field in Hokkaido.

2003 ◽  
Vol 72 (1) ◽  
pp. 11-18
Author(s):  
Tomoyuki YUKAWA ◽  
Yasuo OHSHITA ◽  
Hirotoshi AWAZAKI ◽  
Jiro WATANABE
Keyword(s):  
Paddy Field ◽  
Rice Cultivation ◽  
Waxy Rice ◽  
Direct Sowing

Rice (Oryza sativa L.) germplasm with better seedling emergence under direct sowing in flooded paddy field

2018 ◽  
Vol 16 (4) ◽  
pp. 352-358 ◽  
Author(s):  
Junichi Kashiwagi ◽  
Koji Hamada ◽  
Yutaka Jitsuyama
Keyword(s):  
Paddy Field ◽  
Oryza Sativa L ◽  
Seedling Emergence ◽  
Screening Method ◽  
Paddy Fields ◽  
Rice Germplasm ◽  
Geographical Regions ◽  
Wide Range ◽  
Cultivation Practice ◽  
Direct Sowing

AbstractDirect sowing of rice in a flooded paddy field is a beneficial cultivation practice for water use and labour efficiency, compared to the transplanted cultivation. However, a drastic reduction in seedling emergence under flooded paddy fields is a serious constraint especially when the seeds fell at deeper soil layers. Suitable rice germplasm for the direct sowing in flooded paddy fields could ensure the success of this cultivation practice. Instead of laborious field-based screening systems, a pot-based screening method was adopted for simplicity and efficient evaluation of seedling emergence of a subset of world rice germplasm (n = 75) at different sowing depths. As a result, two rice genotypes, ‘Vary Futsi’ (landrace from Madagascar, non-glutinous, subspecies Indica) and ‘Dahonggu’ (landrace from China, non-glutinous, subspecies Indica), with consistently better seedling emergence were identified from a wide range of rice germplasm. These genotypes could serve as excellent parents for the breeding program in developing new rice cultivars with the improved seedling emergence in flooded paddy fields. There were no significant differences in the seedling emergence rate in flooded paddy conditions among the groups from various agro-geographical regions.

scholarly journals Effects of Forage Rice Cultivation on Carbon and Greenhouse Gas Balances in a Rice Paddy Field

Atmosphere ◽  
2018 ◽  
Vol 9 (12) ◽  
pp. 504 ◽  
Author(s):  
Fumiaki Takakai ◽  
Masahiro Kobayashi ◽  
Takashi Sato ◽  
Kentaro Yasuda ◽  
Yoshihiro Kaneta
Keyword(s):  
Greenhouse Gas ◽  
Paddy Field ◽  
Net Primary Production ◽  
Ghg Emissions ◽  
Co2 Flux ◽  
Rice Paddy ◽  
Bare Soil ◽  
Rice Cultivation ◽  
Forage Rice ◽  
Ch4 And N2o

The effects of conversion from staple rice to forage rice on carbon and greenhouse gas (GHG) balances in a paddy field were evaluated. A staple rice plot without the application of livestock manure compost (LMC, S − M plot) and forage rice plots with and without the application of LMC, derived mainly from cattle (2 kg−FW m−2, F + M and F − M plots, respectively), were established. CH4 and N2O fluxes and CO2 flux from a bare soil plot for organic matter decomposition (OMD) were measured. The carbon budget was calculated by subtracting the OMD, CH4 emission, and harvested grain and straw (forage rice only) from the net primary production and LMC. The net GHG balance was calculated by integrating them as CO2 equivalents. There were no significant differences in GHG flux among the plots. Compared to the carbon loss in the S − M plot, the loss increased by harvesting straw and was mitigated by LMC application. The net GHG emission in the F + M plot was significantly lower than that in other plots (1.78 and 2.63−2.77 kg CO2-eq m−2 year−1, respectively). There is a possibility that GHG emissions could be suppressed by forage rice cultivation with the application of LMC.

scholarly journals Risk Factors of Leptospirosis in Rice Cultivators as Compared to non Rice Cultivators in Punjab, Pakistan

2018 ◽  
Vol 23 (4) ◽  
pp. 536-539
Author(s):  
Muhammad Athar Khan ◽  
Muhammad Zahid Latif ◽  
Syed Amir Gilani ◽  
Ifrah Bukhari
Keyword(s):  
Public Health ◽  
Paddy Field ◽  
Strong Association ◽  
Rice Paddy ◽  
Rice Cultivation ◽  
Ethical Review ◽  
Body Parts ◽  
Rice Paddy Field ◽  
Paddy Water ◽  
Union Council

Leptospirosis is a global zoonotic infectious disease having alarming public health concerns. Generally this is an occupation related disease and the victims belong to animal slaughtering, owners of pet shops, farm workers, handlers of meat, sewerage and agriculture workers. Leptospirosis affect multiple organs in human body and may lead to myocarditis, renal failure, respiratory distress and hypotension. This disease is an emerging infectious problem in many developing countries like Pakistan. A total of 250 subjects were selected from five different rice growing districts of Punjab, Pakistan after the approval of institutional ethical review board (IERB), 250 subjects were selected for this comparative cross sectional study. Multiple stage probability technique was used for sampling. In the first stage one union council was selected from each district randomly. In the second stage, 25 subjects involved in rice cultivation from the last 10 years wereselected from each union council. Similarly 25 subjects who never worked in the rice paddy field were also randomly selected from each union council as controls. The serum sample of each subject was tested against each of the five antigens against the serovars. A total of 250 subjects were included in the study. Out of these, 125 subjects were exposed to the rice paddy water where as 125 were not exposed to rice paddy water. The cumulative seropositivity among the exposed is (83.2%) as compared to (42%) among the non exposed to rice paddy field water. The calculated cumulative odds ratio is 6.7 which represent a strong association of the risk for the development of disease among the exposed than the non exposed subjects. Leptospirosis is a public health zoonotic disease which is widely present in tropical and sub tropical areas. This study concludes that there is a strong association of rice cultivation with Leptospirosis. It is recommended that rice cultivators should protect their body parts with gloves or boots as prevention is the most appropriate way to control any disease.

Establishment of optimal barley straw biochar application conditions for rice cultivation in a paddy field

2017 ◽  
Vol 41 (4) ◽  
pp. 1793-1803
Author(s):  
S. W. Kang ◽  
J. H. Park ◽  
S. H. Kim ◽  
D. C. Seo ◽  
Y. S. Ok ◽  
...  
Keyword(s):  
Paddy Field ◽  
Rice Cultivation ◽  
Barley Straw ◽  
Barley Straw Biochar

scholarly journals A STUDY ON THE SAR DATA OBSERVATION TIME FOR THE CLASSIFICATION OF PLANTING CONDITION OF PADDY FIELDS

2016 ◽  
Vol XLI-B8 ◽  
pp. 927-930
Author(s):  
A. Kimura ◽  
A. Kondo ◽  
K. Mochizuki
Keyword(s):  
Paddy Field ◽  
Low Cost ◽  
Observation Time ◽  
Paddy Fields ◽  
Synthetic Aperture ◽  
Initial Growth ◽  
Acquisition Costs ◽  
Statistical Distance ◽  
Direct Sowing

In recent years, cultivation methods of rice have been diversified due to the low cost of rice-growing techniques. For example, there is direct sowing of seed rice in paddy field in addition to the practice of usual paddy field to flooding at the time of planting. The yield of the usual paddy field and the direct sowing is different even though the same varieties are grown in the same area. It is necessary to grasp by performing classification for the usual paddy field or direct sowing for the management of agricultural crops. The main objective of this study was to select the observation time for the classification of paddy fields’ planting conditions by utilizing Synthetic Aperture Radar TerraSAR-X satellite. The planting conditions included the usual planting of rice, the direct sowing of rice and the soybean. We selected the observation time by the statistical distance of the microwave backscattering in each paddy field for maximizing the planting condition classification. In addition, the satellite data observation timing considered the processing time of the analysis and the acquisition costs. The acquisition was performed 4 periods from 2 periods in the rice growing season and the planting phase. In the current study, we were able to classify the usual planting of rice, the direct sowing of rice and the soybean by TerraSAR-X data for the later planting of rice during mid-May and initial growth of rice in early June.

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