Effect of Nitrogen Sources for Spikelet Sterility and Yield of Boro Rice Varieties

Sixteen genotypes of rice (including one check) were evaluated on 18 quantitative traits during sali (August), 2018 in a randomized block design with three replications at Instruction cum Research Farm, Department of Plant Breeding and Genetics, Assam Agricultural University, Jorhat to study the nature and magnitude of variability, heritability and genetic advance under delayed sown condition. The analysis of variance for 18 quantitative traits revealed the presence of significant differences for grain yield and its component characters. The highest genotypic coefficient of variation (GCV) and phenotypic coefficient of variation (PCV) was observed for chaffs per panicle followed by grains per panicle, spikelet sterility (%), spikelets per panicle, grain yield (kg/ha). A high heritability coupled with high genetic advance was observed for plant height (cm), spikelets per panicle, spikelet sterility (%), chaffs per panicle, grains per panicle, grain yield (g/hill), grain yield (kg/ha), biological yield (kg/ha), straw weight (kg/ha) and harvest index (%) indicating that selection might be effective for improvement of these characters under delayed sown condition with low input. From the findings of this investigation, one genotype viz., Gandhari emerged as the outstanding genotype which yielded 4170 kg/ha and could be directly used for cultivation in delayed sown situation with low inputs. Some other promising genotypes that yielded higher than the check Manoharsali under delayed sown condition were JR 29, JR 16, Basundhara and JR 60 and could be utilized as potential parental material in the hybridization programmes designed to develop suitable rice varieties for delayed sown situation.

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ASSESSMENT OF CLIMATE CHANGE IMPACTS ON AMAN AND BORO RICE YIELDS IN BANGLADESH

Climate Change Economics ◽

10.1142/s2010007816500081 ◽

2016 ◽

Vol 07 (03) ◽

pp. 1650008 ◽

Cited By ~ 9

Author(s):

M. MEHEDI HASAN ◽

Md. ABDUR RASHID SARKER ◽

JEFF GOW

Keyword(s):

Climate Change ◽

Time Series Data ◽

Climate Change Impacts ◽

Series Data ◽

Rice Varieties ◽

Cross Sectional ◽

Climate Conditions ◽

Climatic Regions ◽

Rice Yields ◽

Boro Rice

Despite substantial volumes of research on the impacts of climate change on rice productivity little attention has been paid in evaluating how these impacts differ between traditional varieties (TVs) and high yielding varieties (HYVs). In this study, Aman and Boro rice yields are examined, as respective examples. Cross-sectional time series data over 41 years for four climatic regions of Bangladesh has been used to explore this issue. Each region was examined individually and then across region comparisons were made to try to understand the impacts of major climate variables: average temperature, temperature range, and seasonal rainfall. Using both linear regression and panel data regression models, the major findings are that HYVs for both Aman and Boro rice varieties have less capacity to cope with changing climate conditions in contrast to TVs. Therefore, government should help to promote research and development aimed at developing more climate tolerant varieties, particularly temperature tolerant HYVs which have the potential to solidify the country’s food security situation at least in terms of food availability.

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Effect of Different Doses of Urea on the Yield of Boro Rice Varieties in Haor Areas of Bangladesh

Asian Plant Research Journal ◽

10.9734/aprj/2019/v3i230061 ◽

2019 ◽

pp. 1-9

Author(s):

Mahmudul Karim ◽

Md. Abul Kashem ◽

Azmul Huda ◽

Md. Abdul Aziz ◽

Bani Krishna Goswami

Keyword(s):

Grain Yield ◽

Plant Height ◽

Block Design ◽

Growth Yield ◽

Fertilizer Application ◽

Higher Plant ◽

Rice Varieties ◽

Urea Fertilizer ◽

Two Factors ◽

Boro Rice

The experiment was carried out at Sunamganj district during November 2016 to May 2017 to observed the effect of urea fertilizer on the yield of boro rice varieties in haor areas of Bangladesh. Two factors experiment viz. Varieties BRRI dhan29 and BRRI dhan58; and six urea fertilizer levels including: 340 (F1), 320 (F2), 300 (F3), 280 (F4), 260 (F5), and 165 kg ha-1 (F6) [Farmer’s practice (FP)] were used. In case of F1-F5, the MoP-TSP-CaS04-ZnS04 as 127-112-75-11 kg ha-1 were used while Farmers’ practice (FP) was done with only 82 kg ha-1 TSP. The experiment was laid out in two factors randomized complete block design (RCBD) with three farmers’ replications. Data were collected on growth, yield and yield contributing characters of boro rice. Plant height varied at harvest stage in relation to variety and fertilizer. The tillers production hill-1 varied at harvest in case of variety and urea application. Higher plant height was found in BRRI dhan58 (93.9 cm) in comparison to BRRI dhan29 (90.3 cm). Plant height was also influenced due to urea fertilizers application. The higher tillers hill-1 (15.9), effective tillers hill-1 (12.3) and longer panicle length (21.1 cm) were produced by BRRI dhan58 at harvest compared to BRRI dhan29. The longest panicle (21.4 cm) was produced in the treatment F3 (300 kg urea ha-1). Higher number of sterile spikelets panicle-1 (58.5) and 1000-grain weight (23.2 g) was produced by BRRI dhan58. Higher number of grains panicle-1 (137.5) was produced by BRRI dhan29. The highest grain yield (6.7 t ha-1) and straw yield (7.91 t ha-1) were obtained in the treatment F3 (300 kg urea ha-1). The experimental soil analyses showed that the nutrient contents in post-harvest soils were higher compared to initial soil due to balanced fertilizer application. It is concluded that 300 kg urea ha-1 promoted highest grain yield.

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Improvement of salinity tolerance in rice during boro season by proline application

Progressive Agriculture ◽

10.3329/pa.v29i4.41343 ◽

2019 ◽

Vol 29 (4) ◽

pp. 295-303

Author(s):

F Jahan ◽

D Bhusan ◽

M Jahiruddin ◽

Y Murata ◽

MA Hoque

Keyword(s):

Nutrient Uptake ◽

Soil Salinity ◽

Block Design ◽

Organic Matter Content ◽

Cellular Damage ◽

Growth And Yield ◽

Silty Clay ◽

Salt Tolerant ◽

Rice Varieties ◽

Boro Rice

Salinity causes cellular damage, limiting crop productivity. Accumulation of proline is one of the main adaptive mechanisms to salinity in plants. The main objective of this study was to mitigate the adverse effects of soil salinity in boro rice by exogenous application of proline. The field experiment was conducted at the farmer’s field of Botiaghata, Khulna with Boro rice. The soil was silty clay loam having pH 7.2, EC 6.6 dS/m, CEC 26 meq/100 g soil and organic matter content 0.84%. Two rice varieties (salt-sensitive; BRRI dhan29 and salt-tolerant; BINA dhan-8) were used as test crops. There were ten treatment combinations with different concentrations of proline applied at seedling and/or vegetative stages. Recommended doses of N, P, K, S and Zn fertilizers were applied to the all experimental plots. The experiments were laid out in a randomized complete block design with three replications. Soil salinity caused a significant reduction in growth and yield of both salt-sensitive and salt-tolerant rice. Salt-tolerant rice produced higher grain and straw yields than salt-sensitive rice. Application of proline significantly increased growth, and grain and straw yields of boro rice under saline condition. There were no considerable variations in growth and yield of rice due to the different doses of proline. Increased nutrient uptake and K+/Na+ ratio in boro rice were observed due to proline application. The present study suggests that exogenous proline improves salt tolerance in rice by increasing K+/Na+ ratio and nutrient uptake. Progressive Agriculture 29 (4): 295-303, 2018

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Effect of high temperature on some physiological parameters of grain growth and yield of boro rice varieties

Journal of Bioscience and Agriculture Research ◽

10.18801/jbar.070116.72 ◽

2016 ◽

Vol 7 (1) ◽

pp. 600-607

Author(s):

P. Hazra ◽

M. T. Islam ◽

G. C. Das

Keyword(s):

High Temperature ◽

Grain Growth ◽

Physiological Parameters ◽

Growth And Yield ◽

Rice Varieties ◽

Boro Rice

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Crop Production in the Haor Areas of Bangladesh: Insights from Farm Level Survey

The Agriculturists ◽

10.3329/agric.v8i2.7582 ◽

1970 ◽

Vol 8 (2) ◽

pp. 88-97 ◽

Cited By ~ 6

Author(s):

M Shahe Alam ◽

MA Quayum ◽

MA Islam

Keyword(s):

Crop Production ◽

Flood Control ◽

Secondary Data ◽

Land Utilization ◽

Rice Varieties ◽

Cropping Intensity ◽

Cropping Patterns ◽

Control Devices ◽

The Cost ◽

Boro Rice

A study was conducted in the haor areas of Bangladesh to assess the land utilization status, delineate the productivity and profitability of growing modern rice, evaluate the existing cropping patterns and assess the prospect of possible cropping patterns. Both primary and secondary data were used in the study. Applying the conventional descriptive statistics, the study revealed that, there are about 1.26 million hectares of cultivated lands in seven haor districts, of which 66% falls under haor area. In Kishoregonj and Hobigonj, nearly 94 and 87% areas were devoted to MV Boro rice production. Both BRRI dhan 28 and 29 were being the widely adopted rice varieties. On an average, about 33% of the haor areas were under mechanized irrigation, but in Kishoregonj, the coverage of mechanized irrigation was 87% that helped increasing cropping intensity. The cost of production for MV Boro was almost double than that of LV rice. The yield of MV Boro was 79% higher than that of LVs and the return from MVs was 82% higher. Rabi-Fallow-T. Aman, Vegetable-Aus-T. Aman and Rabi-B.Aman patterns were the potential cropping patterns in some selected areas and this could increase both cropping intensity and productivity in those areas. According to the farmers' assessment, lack of flood control dam and lack of short duration varieties etc. are the major hindrance to the adoption of potential cropping patterns. Construction of community harvest and threshing facilities and flood control devices could be the important public interventions for enhanced agricultural productivity in the haor areas. Key words: Haor areas; potential pattern; productivity; mechanization; profitability DOI: 10.3329/agric.v8i2.7582 The Agriculturists 8(2): 88-97 (2010)

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Relative abundance of insect pests and their predators on boro rice

Bangladesh Journal of Agricultural Research ◽

10.3329/bjar.v43i1.36182 ◽

2018 ◽

Vol 43 (1) ◽

pp. 81-88

Author(s):

MA Bakar ◽

MMH Khan

Keyword(s):

Relative Abundance ◽

Insect Pests ◽

Rice Varieties ◽

Green Rice Leafhopper ◽

Insect Predators ◽

Initiation Stage ◽

Boro Rice

The study was conducted to know the relative abundance of insect pests and their predators on 5 boro rice varieties namely Arize tez, Teea, Sakti, Sathi and BRRI Dhan 28. In Arize Tez variety, short horned grasshopper revealed the highest percent relative abundance (87.25%) at tillering stage and green rice leafhopper was only at panical initiation stage. Among insect predators, wasp showed the highest percent relative abundance (33.33%) both at tillering and panical initiation stages. In Teea variety, the highest percent relative abundance of short horned grasshopper was recorded at tillering (80.21%) and panicle initiation (86.03%) stages while spider and lady bird beetle had 21.05% at tillering stage, wasp (21.05% and 40.00%), damselfly (21.05% and 40.00%) at tillering and panical initiation stages, respectively. In Sakti variety, short horned grasshopper had the highest percent relative abundance (72.54% and 69.05%) at tillering and panicle initiation stages while dragonfly had 30.77% at tillering, wasp had 30.77% and 66.66% at tillering and panicle initiation stages. In Shathi variety, the highest percent relative abundance of short horned grasshopper was recorded at tillering (59.46%) and panicle initiation (52.27%) stages while wasp (41.67%) at panical initiation stage. In variety BRRI dhan 28, the highest percent relative abundance of insect pests was recorded in short horned grasshopper (76.73% and 86.05%) both at tillering and panicle initiation stages while in insect predators, wasp had 40% at tillering and 50% at panicle initiation stages but dragonfly had 50% only at panicle initiation stage.Bangladesh J. Agril. Res. 43(1): 81-88, March 2018

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Impact of high temperature on pollen germination and spikelet sterility in rice: comparison between basmati and non-basmati varieties

Crop and Pasture Science ◽

10.1071/cp10020 ◽

2010 ◽

Vol 61 (5) ◽

pp. 363 ◽

Cited By ~ 9

Author(s):

Bidisha Chakrabarti ◽

P. K. Aggarwal ◽

S. D. Singh ◽

S. Nagarajan ◽

H. Pathak

Keyword(s):

High Temperature ◽

Pollen Germination ◽

Rice Yield ◽

Pollen Grains ◽

Pollen Sterility ◽

Basmati Rice ◽

Pollen Deposition ◽

Spikelet Sterility ◽

Rice Varieties ◽

Increased Temperature

Increased temperature due to global warming may reduce pollen germination and induce spikelet sterility in rice crops. Anthesis is the most sensitive stage in rice and exposure to high temperature during this period may cause reduction in floral reproduction. Increased temperature will have different effects on different rice varieties. In the present study the effect of high temperature on pollen as well as on spikelet sterility in basmati (aromatic) and non-basmati (non-aromatic) rice varieties was quantified. Rice varieties were grown at 11 different sowing dates, to see the effect of varying temperature on pollen and spikelet sterility. Rise in temperature increased pollen sterility and reduced germination of pollen grains on the stigma. Temperature above 33°C during anthesis gradually increased pollen sterility in all rice cultivars. At 35.5°C, variety Pusa Sugandh 2 (basmati) recorded a pollen sterility of 17% and 26% reduction in pollen germination. The principal cause of sterility was reduced anther dehiscence and less pollen deposition on the stigma at higher temperature. Increased temperature during the grain-filling period also increased spikelet sterility in rice and variety Pusa Sugandh 2 was most affected. Non-basmati rice varieties were less affected by increased temperature than basmati types. The study indicated that increasing temperature could limit rice yield by affecting pollen germination and grain formation. It also suggested that sensitivity of pollen grains to temperature damage could be taken as one of the most important parameters for predicting rice yield in warmer climates.

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