Effect of Nitrogen Levels and Weed Management on Yield Performance of BRRI Hybrid Dhan3 Under AWD Irrigation System

Bhuiyan, M. K. A.; Mahbub, Mostofa; Nahar, L; Baki, Zakaria Ibne

doi:10.3329/baj.v20i1.34877

Cited by 3 publications

(3 citation statements)

References 5 publications

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“…Smart technology such as location-specific variety, profitable cropping sequences, innovative cultural management, and appropriate agronomic management with smart dissemination using multiple means would maximize rice yield and minimize production barriers of rice. It is observed from different experimental results that rice yield could be increased by 0.74 t ha -1 by adopting proper agronomic management (Bhuiyan et al, 2017). Site-specific nutrient management improved productivity and profitability in rainfed lowlands of the Philippines and get 6% more yield and reduce nitrogen use in the farmers' field (Banayo et al,2018).…”

Section: Site-specific and Season Wise Agronomic Managementmentioning

confidence: 99%

Agronomic Management and Interventions to Increase Rice Yield in Bangladesh

Bhuiyan¹,

Islam²,

Sarkar³

et al. 2021

Bangladesh Rice J.

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Avenues of agronomic manipulation need to be explored critically for getting potential rice yield in a given environment. Increasing population, decreasing resources and increasing climate vulnerability such as salinity, drought, submergence, early flash flood in haor areas can interrupt achieving the target of rice yield. Location specific variety, profitable cropping sequences, innovative and smart cultural management, and appropriate agronomic management with smart dissemination using multiple means would maximize rice yield and decrease the production barriers of rice. Appropriate variety and location- specific crop management systems should be formulated for rice yield maximization to reduce yield gap in farmers’ field. A number of approaches can be undertaken for maximizing rice yield by adopting location-specific crop production e.g., manipulating sowing and planting times, appropriate weed management technology in proper time, suitable variety selection for improving cropping intensity, Judicious and balance application of organic and inorganic fertilizer application etc. Nitrogen application before panicle primordia is crucial because at this stage panicle primordia determined the spikelet number of the panicle and the absorbed nitrogen is efficiently used to increase spikelet number, accumulated photosynthates to leaf sheath and culm and, hence, increases panicle size and grain yield. Farmers should have a plan and should follow different steps of rice production to get higher yield and sustain productivity. Rice growth stage- wise agronomic management should be followed to get maximum yield. Choice of appropriate variety in a specific location or ecosystem is a major concern that contributed about 20% to the grain yield. Whereas management is a big issues which contributed about 60% for obtaining higher grain yield.The difference of environment × management explained the largest variations ( 80%) in explaining the yield. The bridging of knowledge gaps can bridge yield gaps. New paradigms need to be added to transfer and use new high yielding varieties and knowledge based technologies under new policy settings. Bangladesh Rice J. 24 (2): 161-181, 2021

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Section: Site-specific and Season Wise Agronomic Managementmentioning

confidence: 99%

Agronomic Management and Interventions to Increase Rice Yield in Bangladesh

Bhuiyan¹,

Islam²,

Sarkar³

et al. 2021

Bangladesh Rice J.

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“…It was evident from the study that pre planting herbicide Authority 48 SC @ 200 ml ha -1 and 250 ml ha -1 found effective for controlling weeds than other doses of that herbicide. Bhuiyan et al, 2017 reported that different groups of herbicides controlled more than 80% of weeds in different nitrogen management practices in hybrid rice.…”

Section: Weed Control Efficiency (Wce)mentioning

confidence: 99%

Sensitivity of Annual Weeds against Sulfentrazone 48 SC herbicide in Rice Cultivation

et al. 2018

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Herbicides are used successfully for weed control in rice fields for rapid effect, easier to application and low cost involvement in comparison to the traditional methods of hand weeding. Sulfentrazoneis a new pre-planting herbicide in Bangladesh. , pretilachlor 500 EC @ 1000 ml ha -1 , weed free and unweeded control. Visual assessment indicated that this herbicide possesses high selectivity and not toxic to rice plants. The results revealed that the major weed flora associated with the transplanted rice was mainly comprised of two grasses, two sedges and four broadleaves in Aman 2014 and two grasses, two sedge and two broadleaves in Boro 2014-15. The most dominant weeds were Cyperus difformis, Echinochloa crus-galli, Scirpus maritimus and Monochoria vaginalis in both the growing seasons. Application of Sulfentrazone 48 SC @ 200 ml ha -1 was most effective to suppress weed density and dry masses in both the seasons resulting increased grain yield more than 50% as compared to unweeded control. Therefore, Sulfentrazone 48 SC @ 200 ml ha -1 should apply two or three days before plantingfor effectively control weeds in rice.

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“…Many studies have shown that saturated soil conditions significantly increase the number of weed species, density and biomass compared with continuous flooding (Bhager et al, 1999; Mahajan et al, 2009). This is especially true for sedges and grass species (Bhuiyan et al, 2017; Hill et al, 2001). Maintaining soil saturation at the early stage (pre‐sowing to 2–3 leaf stage) in direct‐seeded rice also resulted in the largest weed seed banks, especially in sedges, grasses and some upland weeds (Chen et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Rice–weed competition in response to nitrogen form under high and low transpirational demand

Stuerz

Asch

2021

J Agronomy Crop Science

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Implementation of water‐saving irrigation practices in lowland rice results in increased availability of nitrate (NO3−) in the soil and favours germination of upland weeds. Since plant species show a specific preference for either ammonium (NH4+) or NO3− as nitrogen (N) source, changes in both soil NO3− concentration and weed flora may affect the competition between rice and weeds. Further, the transpirational demand of the atmosphere might affect growth and competitiveness of lowland (wetland) and upland (dryland) weeds differently due to their adaptation to different ecological environments. Therefore, the study aimed to evaluate the effects of N source on growth, N uptake and competition between rice and common upland and lowland weeds under high and low vapour pressure deficit (VPD). Two rice (Oryza sativa) varieties (NU838 and KD18) differing in growth characteristics and two weed species (Echinochloa crus‐galli and Solanum nigrum) differing in their natural habitat were selected and grown hydroponically as monoculture or mixed culture at low or high VPD. N was supplied as 75%/25% or 25%/75% NH4+/NO3−. N uptake rates were measured in the first week, whereas dry matter (DM), N concentration in the plant, total N uptake and the activities of nitrate reductase and glutamine synthetase in the fresh leaves were determined two weeks after the onset of treatments. Independent of N source, both rice varieties and E. crus‐galli took up a larger share of NH4+, whereas S. nigrum took up a larger share of NO3−. N uptake of rice and E. crus‐galli was hardly affected by N source, whereas high NO3− led to significantly higher N uptake rates and total N uptake of S. nigrum. NU838 showed a higher competitiveness against weeds than KD18. In competition, high NO3− decreased the competitiveness of E. crus‐galli against NU838 but increased the competitiveness of S. nigrum against NU838. High VPD did not affect DM but increased N uptake of S. nigrum, leading to increased competitiveness of the weed at high transpirational demand. Competitiveness for N uptake appears to be an important trait as the relative N concentration in mixed plant communities was correlated with the activity of N‐assimilating enzymes and leaf growth, with a stronger response in rice than in weeds. Our results support the hypothesis that increased availability of NO3− in aerobic rice soils may be advantageous for the competitiveness of upland weeds, especially at high VPD, whereas it may be disadvantageous for common lowland weeds.

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Effect of Nitrogen Levels and Weed Management on Yield Performance of BRRI Hybrid Dhan3 Under AWD Irrigation System

Cited by 3 publications

References 5 publications

Agronomic Management and Interventions to Increase Rice Yield in Bangladesh

Agronomic Management and Interventions to Increase Rice Yield in Bangladesh

Sensitivity of Annual Weeds against Sulfentrazone 48 SC herbicide in Rice Cultivation

Rice–weed competition in response to nitrogen form under high and low transpirational demand

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