scholarly journals Studies of Direct-Sowing Culture by Broadcasting Seeds on a Submarged Paddy Field : No. 7 Effects of seeding density and amount of top dressing on the yield of rice and its components

1968 ◽  
Vol 37 (1) ◽  
pp. 21-24
Author(s):  
Seiichi AKAMATSU
Keyword(s):  
Paddy Field ◽  
Seeding Density ◽  
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 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.

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
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