scholarly journals Studies of Direct-Sowing Culture by Broadcasting Seeds on a Submerged Paddy Field : No. 6 Effects of seeding density and amount of fertilizer on the growth and yield of rice

1968 ◽  
Vol 37 (1) ◽  
pp. 17-20
Author(s):  
Seiichi AKAMATSU
Keyword(s):  
Paddy Field ◽  
Growth And Yield ◽  
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 Effect of seedling age, seeding density and nitrogen fertilizer on growth and grain yield of rice (Oryza sativa L.)

2019 ◽  
Vol 3 (1) ◽  
pp. 81
Author(s):  
Saroj Thapa ◽  
Khagendra Thapa ◽  
Jiban Shrestha ◽  
Amit Chaudhary
Keyword(s):  
Oryza Sativa ◽  
Grain Yield ◽  
Management Practices ◽  
Oryza Sativa L ◽  
Critical Factor ◽  
Growth And Yield ◽  
Seeding Density ◽  
Potential Yield ◽  
Seedling Age ◽  
Nitrogen Rates

Rice (Oryza sativa L.) is first staple crop of Nepal. The national average yield of rice is less than its potential yield, for which poor agronomic management has been reported as the critical factor. Among various agro-management practices seedling age, seeding density and nitrogen rates significantly affect the growth and yield of rice. The lower seeding density produces the taller plant, more effective tiller, lower sterility and higher grain yield. On the other hand, seedling of older age from higher seeding density gives the lowest yield. Transplanting younger seedling with low seeding density and application of recommended dose of nitrogen gives a higher yield. This article summarizes various effects of seedling age, seeding density and nitrogen rates on plant height, number of effective tillers, number of filled grains, thousand grain weight and grain yield of rice. This information may be useful for maize growers and researchers.

Effects of Polyethylene Film Mulching on Growth and Yield of Green Soybean in Early-Direct Sowing Cultivation in Upland Field Converted from Rice Paddy in the Hokuriku District

2011 ◽  
Vol 80 (2) ◽  
pp. 213-219
Author(s):  
Katsuyuki Katayama ◽  
Tatsuo Hosono ◽  
Hisashi Hosokawa ◽  
Yukiharu Shioya ◽  
Mikio Nomura
Keyword(s):  
Rice Paddy ◽  
Polyethylene Film ◽  
Growth And Yield ◽  
Film Mulching ◽  
Upland Field ◽  
Direct Sowing

scholarly journals Effects of the Rotary Tilling and Ridge-making Implement on the Growth and Yield of Six-rowed Barley (Hordeum vulgare L.) in an Upland Field Converted from Paddy Field in Hokuriku Region

2012 ◽  
Vol 81 (1) ◽  
pp. 49-55 ◽  
Author(s):  
Sachiko Ikenaga ◽  
Hisashi Hosokawa ◽  
Kazuhide Adachi ◽  
Satoshi Ohno ◽  
Mikio Nomura ◽  
...  
Keyword(s):  
Hordeum Vulgare ◽  
Paddy Field ◽  
Growth And Yield ◽  
Hordeum Vulgare L ◽  
Upland Field

Field evaluation of early vigour for genetic improvement of grain yield in wheat

2002 ◽  
Vol 53 (10) ◽  
pp. 1137 ◽  
Author(s):  
T. L. Botwright ◽  
A. G. Condon ◽  
G. J. Rebetzke ◽  
R. A. Richards
Keyword(s):  
Grain Size ◽  
Grain Yield ◽  
Biomass Production ◽  
Field Evaluation ◽  
Field Trials ◽  
Wheat Breeding ◽  
Growth And Yield ◽  
Seeding Density ◽  
Recurrent Parent ◽  
Early Vigour

Improved early vigour in wheat (Triticum aestivum L.) has been proposed as an important trait for increasing grain yield through greater water-use efficiency in rainfed, Mediterranean-type environments. Three years of field trials were undertaken in Western Australia at 2 sites, Merredin (low rainfall, 244 mm in the growing season) and Wongan Hills (medium rainfall, 308 mm), to examine the influence of increased early vigour on crop growth and yield. The effect of breeding for greater early vigour was tested in 1998 and 1999 using 3 high vigour and 3 low vigour BC2:F5 lines of the cultivar Amery backcrossed to a 'high vigour' donor. Averaged across environments, the high vigour backcross lines had a 10% increase in early vigour (i.e. leaf area/plant) at 50 DAS compared with the low vigour lines. Differences in yield across environments were associated with variation in total rainfall, rainfall distribution, and soil properties. In the wetter of the 2 years (1999), greater early vigour translated to increased yield of c. 12%, averaged across environments, but there was no difference in yield in either environment in the drier year (1998). Potential deleterious effects of the recurrent parent on yield were eliminated in field trials in 1999 and 2000 by manipulating early vigour through varying grain size (25, 35, or 50 mg) or seeding density (50, 200, or 400 plants/m2) of Amery at sowing. Large grain increased the embryo size and early vigour at 50 DAS in both environments in 1999. This translated to greater biomass production at anthesis and maturity to increase grain yield at Wongan Hills in 1999. In contrast, there was no relationship between grain size, biomass production, and yield at Merredin in 1999 or at either site in 2000. Sowing density treatments also had no effect on yield in 2000. In conclusion, there is potential to increase yield of wheat by selecting for greater early vigour in a wheat breeding program. The expression of vigour in field conditions and the translation of this improvement to higher yields is, however, dependent on the environment. Current yield limitations arising through backcrossing with a high vigour, yet poor yielding donor, need to be addressed.

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