Influence of Clinorotation on Total Grain Yield per Plant of MR 219 Rice Seed

2019 ◽  
Vol 19 ◽  
pp. 1446-1450
Author(s):  
C.C. Teoh ◽  
N.A. Zulkifli ◽  
K.K. Ong ◽  
A.B. Norliza ◽  
U.F. Abdul Rauf ◽  
...  
Keyword(s):  
Grain Yield ◽  
Rice Seed

Red Rice (Oryza sativa) Control in Drill-Seeded Rice (O. sativa)

Weed Science ◽  
1985 ◽  
Vol 33 (5) ◽  
pp. 703-707 ◽  
Author(s):  
Amadou Diarra ◽  
Roy J. Smith ◽  
Ronald E. Talbert
Keyword(s):  
Oryza Sativa ◽  
Grain Yield ◽  
Field Experiments ◽  
Growing Season ◽  
Rice Cultivar ◽  
Rice Grain ◽  
Rice Seed ◽  
Red Rice ◽  
Culm Density ◽  
High Yields

Field experiments were conducted to investigate methods of controlling red rice (Oryza sativaL. ♯ ORYSA) in drill-seeded rice (O. sativa). Treatments included the rice cultivar ‘Mars', coated with calcium peroxide (CaO2) at 40% (w/w) and a crop protectant, R-33865 (O,O-diethyl-O-phenyl phosphorothioate) at 0.5 and 1% (v/w). Molinate (S-ethyl hexahydro-1H-azepine-1-carbothioate) at 6.7 kg ai/ha was applied preplant incorporated (ppi). The land was flooded (2.5 to 5 cm deep) after seeding with rice (100 kg/ha, 2.5 cm deep), and the water was maintained throughout the growing season. CaO2, with or without molinate, increased rice grain yield 50% and increased rice culm density fivefold above untreated rice. Molinate applied ppi controlled 96% of the red rice. Rice seed coated with only CaO2or with CaO2plus R-33865 at 0.5%, each combined with ppi molinate, produced 5690 and 6030 kg/ha of grain, respectively. These high yields were associated with red rice control by molinate and good stands of rice provided by O2supplied by CaO2. R-33865 applied to rice seed at 1% (v/w) injured rice by reducing rice culm densities 41%, compared with rice without protectant.

Competition of Bearded Sprangletop (Leptochloa fascicularis) with Rice (Oryza sativa)

Weed Science ◽  
1983 ◽  
Vol 31 (1) ◽  
pp. 120-123 ◽  
Author(s):  
Roy J. Smith
Keyword(s):  
Oryza Sativa ◽  
Grain Yield ◽  
Paddy Rice ◽  
Rice Grain ◽  
Rice Seed ◽  
Weed Density ◽  
Weed Plant ◽  
Linear Decrease ◽  
Head Rice ◽  
Rice Yields

Yields of drill-seeded paddy rice (Oryza sativaL. ‘Lebonnet’) at optimum stands of 215 to 270 plants/m2at Stuttgart, Arkansas, were reduced 9, 18, 20, and 36% by bearded sprangletop [Leptochloa fascicularis(Lam.) Gray] densities of 11, 22, 54, and 108 plants/m2, respectively. There was a linear decrease in rice grain yield of 21 kg/ha for each bearded sprangletop plant per square meter. Weed densities of 54 and 108 plants/m2reduced head-rice yields (whole milled kernels) and a density of 108 plants/m2reduced germination of rice seed. The number of bearded sprangletop panicles produced per weed plant decreased as the weed density increased.

scholarly journals Different soaking times and niacin concentrations affect yield of upland rice under water deficit conditions

2019 ◽  
Vol 37 (2) ◽  
pp. 166-172
Author(s):  
Eduardo Pradi Vendruscolo ◽  
Aliny Heloísa Alcântara Rodrigues ◽  
Sávio Rosa Correa ◽  
Alexander Seleguini ◽  
Sebastião Ferreira de Lima
Keyword(s):  
Grain Yield ◽  
Water Deficit ◽  
Plant Development ◽  
Maximum Concentration ◽  
Upland Rice ◽  
Seedling Emergence ◽  
Rice Seed ◽  
Relative Index ◽  
Spikelets Per Panicle ◽  
Production Characteristics

Rice is an important source of energy for a large part of the world’s population. The development and application of technologies that contribute to the improvement of production forthis grain have great importance. The objective of this study was to evaluate the influence of rice seed immersion in a niacin solution on plant development, physiology and production. Thetreatments were defined by a combination of two immersion times for the seeds (12 h and 24 h) in four niacin concentrations (0.00, 100, 200 and 300 mg L-1) distributed in five replicates. Characteristics relating to seedling emergence, plant vegetativedevelopment, relative indices of chlorophyll and grain yield were evaluated. We verified that the immersion of the seeds for 12 h gave higher relative indices of chlorophyll, whereas immersion for 24 h increased the speed of emergence and the number of tillers and panicles. The doses of niacin positively affected the relative chlorophyll indices and the production characteristics, up to a maximum concentration of 172.57 mg L-1. We concluded that the immersion of rice seeds for 24 h increased the speed of seedling emergence, leaf number, and panicles per area. However, the relative indices of chlorophyll in leaves decreased. The use of niacin promoted the numbers of spikelets per panicle, fertility of the spikelets and the weight of 1000 grains, besides increasing the relative index of chlorophyll in the leaves of rice plants.

scholarly journals EFFECT OF NITROGEN-FIXING BACTERIA ON GRAIN YIELD AND DEVELOPMENT OF FLOODED IRRIGATED RICE

2016 ◽  
Vol 29 (1) ◽  
pp. 11-17 ◽  
Author(s):  
AMAURI NELSON BEUTLER ◽  
GIOVANE MATIAS BURG ◽  
EVANDRO ADEMIR DEAK ◽  
MARCELO RAUL SCHMIDT ◽  
LEANDRO GALON
Keyword(s):  
Grain Yield ◽  
Rice Grain ◽  
Rice Seed ◽  
Nitrogen Fixing ◽  
Irrigated Rice ◽  
Randomized Design ◽  
Four Levels ◽  
Set Up ◽  
Nitrogen Rates ◽  
Liquid Inoculant

ABSTRACT: This study aimed at evaluating the effect of Azospirillum brasilense, a nitrogen-fixing bacterium, on flooded irrigated rice yield. Evaluations were carried out in a shaded nursery, with seedlings grown on an Alfisol. Were performed two sets of experiments. In the first, were carried out four experiments using the flooded rice cultivars INIA Olimar, Puitá Inta-CL, Br Irga 409 and Irga 424; these trials were set up as completely randomized design in a 5x4 factorial scheme, with four replications. Treatments consisted of five nitrogen rates (0, 40, 80, 120 and 160 kg ha-1) and four levels of liquid inoculant Ab-V5 and Ab-V6 - A. brasilense (0, 1, 2 and 4 times the manufacturer's recommendation) without seed treatment. In second set, were performed two experiments using the cultivars Puitá Inta-CL and Br Irga 409, arranged in the same design, but using a 4x2 factorial. In this set, treatments were composed of four levels of Ab-V5 and Ab-V6 - A. brasilense liquid inoculant (0, 1, 2 and 4 times the recommendation of 100 mL ha-1), using rice seeds with and without insecticide and fungicide treatment. Shoot dry matter, number of panicles, and rice grain yield per pot were the assessed variables. The results showed that rice seed inoculation with A. brasilense had no effects on rice grain yield of the cultivars INIA Olimar, Puitá Inta-CL, Br Irga 409 and Irga 424.

Effects of Cycocel on Lodging and Grain Yield of Upland and Swamp Rice in Sierra Leone

1971 ◽  
Vol 7 (2) ◽  
pp. 157-160 ◽  
Author(s):  
D. K. Das Gupta
Keyword(s):  
Grain Yield ◽  
Sierra Leone ◽  
Upland Rice ◽  
Foliar Spray ◽  
The Other ◽  
Rice Seed ◽  
Other Hand

SUMMARYIn upland rice, seed soaked in CCC for 24 hours before sowing or sprayed with CCC 10, 21, 42 and 63 days after sowing, showed severe lodging. Effects of CCC on the number of paniclebearing tillers, number of good grains in 1000 grains, weight of 100 good grains and grain yield were not significant. On the other hand CCC prevented lodging in swamp rice, with the lowest percentage when foliar spray was given 21 days after transplanting. CCC failed to increase the number of panicle-bearing tillers and grain yield in swamp rice.

scholarly journals Effect of planting time and nitrogen application on the yield and seed quality of T. Aman rice (Oryza sativa L.)

2014 ◽  
Vol 38 (4) ◽  
pp. 673-688
Author(s):  
ASMI Hussain ◽  
MM Hoque ◽  
MN Huda ◽  
D Hossain ◽  
M Shahjahan
Keyword(s):  
Grain Yield ◽  
Seed Quality ◽  
Oryza Sativa L ◽  
Lower Percentage ◽  
Rice Seed ◽  
Optimum Time ◽  
Spikelet Sterility ◽  
Late Planting ◽  
Planting Time

A field experiment was conducted at the research farm of Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur during June 2006 to December 2007 to find out the effect of planting time and nitrogen fertilization on the yield and seed quality of T. Aman rice. BR11 ( Mukta) was transplanted at different dates from 5 July to 19 August at 15 days interval. The rates of N used in the experiment were 80, 100, 120, and 140 kg N/ha,. Plant height, number of tillers/hill, grain yield, and yield components parameters varied significantly due to transplanting of rice at variable dates. The optimum time of planting was found to be 4 August compared to other dates of transplanting. Result indicates that this variety planted in optimum time gave higher yield with high quality of rice seed. In comparison to early and late planting, earlier planting of the variety was better as the late planted crops were severely affected by adverse environmental condition during reproductive phase. The poor grain yield in early or late planting was due to higher percentage of spikelet sterility. The varieties responded positively with increment of N levels upto 120 kg N/ha. The higher number of panicles/m2, lower percentage of unfilled grain, and heavier individual grain contributed to increase grain yield of this verity. It is, therefore, suggested to transplant BR11 rice in the first week of August in Aman season. The application of N of 100 -120 kg/ha with three splits is optimum for achieving higher grain yield and better quality of rice seed. DOI: http://dx.doi.org/10.3329/bjar.v38i4.19660 Bangladesh J. Agril. Res. 38(4): 673-688, December 2013

scholarly journals Fertilizer and Weed Management Options for Direct Wet Seeded Rice in Dry Season

2016 ◽  
Vol 20 (1) ◽  
pp. 65-75 ◽  
Author(s):  
R Shultana ◽  
JC Biswas ◽  
MAA Mamun ◽  
L Nahar
Keyword(s):  
Grain Yield ◽  
Weed Control ◽  
Weed Management ◽  
Dry Season ◽  
Control Measures ◽  
Rice Seed ◽  
Management Options ◽  
Weed Density ◽  
Direct Seeded ◽  
Hand Weeding

Direct seeding of rice is an emerging technology. However, direct seeded rice culture in the main field is hindered by enormous weed infestation and it lacks judicious fertilizer management. So, experiments were conducted during dry seasons of 2010 and 2012 with three fertilizer packages and four weed control measures. Rice seed was sown in the field using drum seeder in wet soil. The results revealed that weed density and weed biomass were strongly influenced by weed control methods and fertilizer rates. Weed density was higher in unweeded plots with 140:36:43 kg NPK ha-1. Among the species Echinichloa crusgalli (L.) P. Beauv. was the dominant species. Three hand weeding controlled maximum weeds. Uses of herbicide for controlling weeds were above 80 and 70% effective. Strong negative correlation was recorded between grain yield and weed density. Herbicide with one hand weeding and BRRI weeder in combination with 160:46:53 kg NPK ha-1 produced about 81- 104% higher grain yield than no weeding. Weed free plot produced 112% higher yield with 160:46:53 kg NPK ha-1. Besides, herbicide with one hand weeding and BRRI weeder treated plot produced similar yield irrespective of fertilizer doses. The strong positive and linear relationship was found in case of yield and yield components. Herbicide with one hand weeding and 120:26:33 kg NPK ha-1 gave higher net return (1145 $/ha). The benefit cost ratio was also higher in herbicide based weed management with reduced rate of fertilizer. Direct seeded culture using herbicide with one hand weeding and 120:26:33 kg NPK ha-1 could be an option for reducing production cost in dry season along with satisfactory grain yield.Bangladesh Rice j. 2016, 20(1): 65-75

scholarly journals Effects of irrigated rice sowing season and imazapyr + imazapic time of application on rice grain yield and red rice management

2013 ◽  
Vol 31 (3) ◽  
pp. 631-644 ◽  
Author(s):  
G.M.S. Sartori ◽  
E. Marchesan ◽  
C.F. Azevedo ◽  
A.C. Filho ◽  
R. Roso ◽  
...  
Keyword(s):  
Grain Yield ◽  
Block Design ◽  
Sowing Date ◽  
Joint Analysis ◽  
Rice Grain ◽  
Rice Seed ◽  
Red Rice ◽  
Irrigated Rice ◽  
Time Of Application ◽  
Sowing Season

Irrigated rice sowing season and red rice competition are among the main factors affecting grain yield. The objective of this work was to evaluate the sowing date of irrigated rice and moments of application of the herbicide imazapyr + imazapic to control red rice management and irrigated rice grain yield. Eight experiments were performed at the following dates (09/30, 10/19, 11/08 and 12/01) for the 2010/2011 harvest season and (09/27, 10/17, 11/08 and 12/05) for the 2011/2012 harvest season. The treatments were: application of the herbicide imazapyr + imazapic at doses of 105+35 g ha-1 in pre-emergence (PRE); 52.5+17.5 g ha‑1 in pre-emergence and 52.5+17.5 g ha-1 in post-emergence (PRE + POST); and 105+35 g ha-1 in post- emergence (POST), and a control without application and no weeding. The cultivar Puitá Inta CL was used and a randomized block design with four replicates. A joint analysis of the experiments was carried out. There was less emergence of red rice and higher grain yield of the irrigated rice at the early periods (09/30/10 and 09/27/11), with 10,578 and 8,653 kg ha-1, respectively. At the end of the season (12/01/10 and 12/05/11), there was greater reduction of the red rice seed bank. Sowing at the beginning of the recommended period provided more irrigated rice grain yield. The application of imazapyr + imazapic at a dose of 52.5+17.5 g ha-1 in PRE + 52.5+17.5 g ha-1 POST, and 105+35 g ha-1 only in PRE and POST was effective in the control of red rice.

scholarly journals Evaluation of AV-5055 as Seed Dresser in Lowland Rice Production

2021 ◽  
Vol 3 (3) ◽  
pp. 75-79
Author(s):  
I. G. Mohammed ◽  
M. Bashiru ◽  
S. T. Gbadeyan ◽  
B. Ehirin ◽  
S. O. Bakare ◽  
...  
Keyword(s):  
Grain Yield ◽  
Plant Height ◽  
Block Designs ◽  
Rice Seed ◽  
Ecological Zone ◽  
Subsequent Reduction ◽  
Control Data ◽  
Cropping Season ◽  
Significant Difference ◽  
Bird Damage

This experiment was established in 2020 cropping season at National Cereals Research Institute experimental field at Badeggi in Guinea Savannah agro-ecological Zone, (Latitude 9 040 Longitude 6 070 E), to assess seed dressing effect of AV-5055 on rice seed. The experiment was laid out in Randomized Complete Block Designs (RCBD), replicated three times. It consisted of four (4) treatments: application of AV-5055 rate at 0.7L, 1.2L, 1.7L per 100kg of rice seed and no application of chemical as (control). Data was taken on plant height, tiller count, days to 50% flowering, bird damage, rodent damage panicle per meter square and grain yield. The result shows that there was no significant difference (P > 0.05) in plant height, tiller count, days to 50% flowering and bird damage. However, control plot had significantly (P < 0.05) lower rodent damage (0.00) and higher grain yield (2060.00kg/ha) compared to rodent damage and grain yield in treated plots (0.33-2.33) and (1789.00-1999.03) respectively. It was concluded from the result of analysis that AV-5055 offer protection to dressed seed against bird depredation from planted field as there was no significant difference on bird depredation among the various rates of AV-5055 application. However, various rates of AV-5055 application attract picking by rodents and subsequent reduction on yield. Thus it was recommended that AV-5055 should be applied in combination with rodenticides to give perfect seed protection against birds and rodents.

scholarly journals Disruption of MIR396e and MIR396f improves rice yield under nitrogen-deficient conditions

2019 ◽  
Vol 7 (1) ◽  
pp. 102-112 ◽  
Author(s):  
Jinshan Zhang ◽  
Zhenyu Zhou ◽  
Jinjuan Bai ◽  
Xiaoping Tao ◽  
Ling Wang ◽  
...  
Keyword(s):  
Grain Size ◽  
Grain Yield ◽  
Nitrogen Fertilization ◽  
Nitrogen Assimilation ◽  
Rice Yield ◽  
Relative Increase ◽  
Rice Seed ◽  
Above Ground Biomass ◽  
Rice Varieties ◽  
Panicle Development

Abstract The microRNA miR396 directly represses GROWTH-REGULATING FACTORs (OsGRFs) and has been implicated in regulating rice yield and in nitrogen assimilation. Overexpressing the miR396 targets OsGRF4 and OsGRF6 improves rice yield via increased grain size and panicle branching, respectively. Here, we used CRISPR/Cas9 to assess the function of miR396 genes in rice. Knockout of MIR396ef (MIR396e and MIR396f), but not other isoforms, enhanced both grain size and panicle branching, resulting in increased grain yield. Importantly, under nitrogen-deficient conditions, mir396ef mutants showed an even higher relative increase in grain yield as well as elevated above-ground biomass. Furthermore, we identified OsGRF8 as a new target of miR396, in addition to the known targets OsGRF4 and OsGRF6. Disruption of the miR396-targeting site in OsGRF8 was sufficient to both enlarge grain size and elongate panicles. Our results suggest that rice-seed and panicle development are regulated by miR396ef-GRF4/6/8-GIF1/2/3 modules and that miR396ef are promising targets of genome editing for breeding environmentally friendly rice varieties that require less nitrogen fertilization.

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