Effect of nitrogen levels and weed management on weed flora and yield of direct-seeded rice (Oryza sativa) in southern part of Punjab

IF 0.3 4区 农林科学 Q4 AGRICULTURE, MULTIDISCIPLINARY Indian Journal of Agricultural Sciences Pub Date : 2023-10-09 DOI:10.56093/ijas.v93i10.104538
VICKY SINGH, SEEMA SEPAT, JASBIR SINGH, ANAND GAUTAM, G S AULAKH
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Abstract

An experiment was conducted at Krishi Vigyan Kendra, Ferozepur, Punjab during rainy (kharif) seasons of 2018 and 2019 to study the effects of nitrogen levels and weed management in direct-seeded rice (Oryza sativa L.) (DSR). The results indicated that pendimethalin + bispyribac (W1) (5.25 and 2.95 m2) and oxadiargyl + bispyribac (W2) (6.05 and 3.95 m2) application reduced the density of narrow-leaved weeds (NLW) and broad-leaf weeds (BLW) followed by oxadiargyl + fenoxaprop (W3) (7.0 and 4.55 m2) during both the years. Application of W1 decreased the total weed biomass by 84–98.2%, respectively compared to weedy check (W5) (80.1 and 94.8 g/m2) in both years. Treatment W1 and W2 recorded at par values of grain and straw yield followed by W3. An increase (48.6–72.0%) in grain yield was registered with weed practices compared to weedy check in DSR. W1 and W2 significantly recorded higher N uptake in grain (61.45 and 60.85 kg/ha) and total (100.8 and 99.45 kg/ha) followed by W3 (53.85 and 90.35 kg/ha, respectively). The high infestation of BLW with W3 resulted in the lowest weed control efficiency (WCE) (46.2–53.9%) among the weed control practices. N at 120 and 150 kg/ha recorded the low density and biomass of NLW and BLW. Application of 120 and 150 kg N/ha enhanced the grain yield (4.89 and 5.25 t/ha) and net returns (55.1 and 60.5 × 103 ₹/ha) in both years. No N application recorded lowest N uptake in grain (87.71 kg/ha) and total (80.26 kg/ha) compared to 150 kg N/ha in both years. N levels at 120 and 150 kg/ha recorded higher values of water control efficiency (WCE). Based on the findings, it may be concluded that pendimethalin + bispyribac and oxadiargyl + bispyribac with N 120 kg/ha application can reduce weed flora diversity with higher grain yield of direct-seeded rice in Punjab.
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氮素水平和杂草管理对旁遮普南部直播水稻杂草区系及产量的影响
在2018年和2019年雨季,在旁遮普省费罗采普尔的Krishi Vigyan Kendra进行了一项试验,研究了氮素水平对直播水稻(Oryza sativa L.)杂草管理的影响。结果表明:两年内,喷施二甲醚+双吡虫胺(W1)(5.25和2.95 m2)和恶二乙胺+双吡虫胺(W2)(6.05和3.95 m2)分别降低了窄叶杂草(NLW)和阔叶杂草(BLW)的密度,其次是恶二乙胺+苯硝唑(W3)(7.0和4.55 m2)。施用W1与施用W5 (80.1 g/m2和94.8 g/m2)相比,两年内杂草总生物量分别减少了84 ~ 98.2%。处理W1和W2以籽粒和秸秆产量的标准值记录,W3次之。与DSR的杂草检查相比,杂草处理的粮食产量增加了48.6% - 72.0%。W1和W2籽粒吸氮量(61.45和60.85 kg/ha)和总吸氮量(100.8和99.45 kg/ha)显著高于W3(53.85和90.35 kg/ha)。W3对BLW的高侵染导致WCE(46.2 ~ 53.9%)在不同防杂草措施中最低。N值为120和150 kg/ha时,低密度和低生物量均较低。施用120和150公斤氮/公顷在这两年都提高了粮食产量(4.89和5.25吨/公顷)和净收益(55.1和60.5 × 103卢比/公顷)。与150 kg N/ha相比,无施氮肥的籽粒吸氮量最低(87.71 kg/ha),总吸氮量最低(80.26 kg/ha)。氮素水平为120和150 kg/ hm2时,水分控制效率(WCE)较高。综上所述,在旁遮普地区,喷施120 kg/ hm2的戊二甲基灵+双嘧菌酯和恶二甲酰+双嘧菌酯可降低水稻杂草群落多样性,提高水稻籽粒产量。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Indian Journal of Agricultural Sciences
Indian Journal of Agricultural Sciences 农林科学-农业综合
CiteScore
0.80
自引率
25.00%
发文量
273
审稿时长
6 months
期刊介绍: The Indian Journal of Agricultural Sciences publishes papers concerned with the advancement of agriculture throughout the world. It publishes original scientific work related to strategic and applied studies in all aspects of agricultural science and exploited species, as well as reviews of scientific topics of current agricultural relevance. Specific topics of interest include (but are not confined to): genetic resources, all aspects of crop improvement,crop production,crop protection, physiology, modeling of crop systems, the scientific underpinning of agronomy, engineering solutions, decision support systems, land use, environmental impacts of agriculture and forestry, impacts of climate change, rural biodiversity, experimental design and statistical analysis, the application of new analytical and study methods (including molecular studies) and agricultural economics. The journal also publishes book reviews. Articles are accepted on the following broad disciplines: Agric. Engineering & Technology, Agric. Social & Economic Sci., Agronomy, Biometry, Biosciences, Cytology, Ecology, Environmental Sciences, Fertilization, Forestry , Genetics, Horticultural Sciences, Microbiology, Pest, Weed Control etc., Molecular Biology, Plant Pathology, Plant Breeding, Physiology and Biochemistry, Soil Sciences, Special Cultivation Technology, Stress Breeding, Agric. extension, and Cell Biology.
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