 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Response of Weeds and Wheat Yield to Tillage and Weed Management) ผู้เขียน: Jagat DEVI RANJIT, รังสิต สุวรรณเขตนิคม สื่อสิ่งพิมพ์:pdf AbstractWeed flora and yield attributes of wheat in two tillage systems (conventional and minimum tillage) with five weed management systems (unweeded control, handweeding one, post emergence application of sulfosulfuron @ 28 g ai/ha, post emergence application of fenoxaprop-P-ethyl @ 100g ai/ha, and rice straw mulch @ 4 t/ha + sulfosulfuron @ 26 g ai/ha) were evaluated in Khumaltar, Nepal from 2001-02 to 2002-03 winter season. The most common narrowleaf weed species were Alopecuros aequalis and Phalaris minor and broadleaf dicot were Chenopodium album, Coronopus didymus, Rumex crispus, Stellaria media, and Soliva anthemifolia. The population of A. aequalis, P. minor, R. crispus, and S. media was more in conventional tillage at 4 weeks after sowing compared to minimum tillage. The total population of narrowleaf weeds was higher in conventional tillage than in minimum tillage at 4 and 8 weeks after sowing. Sulfosulfuron gave broader spectrum of weed control than fenoxaprop-P- ethyl. Sulfosulfuron has suppressed both narrowleaf and broadleaf weeds. Fenoxyprop-P-ethyl suppressed only narrowleaf weeds, but broadleaf weeds like C. album, C. didymus, R. crispus, S. anthemifolia, and S. media were not suppressed. Among the weed management treatments, sulfosulfuron, handweeding one, and straw mulch + sulfosulfuron were the best in terms of weed suppression and yield attributes. There was no impact of conventional tillage and minimum tillage on grain yield of wheat. |
หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Response of Weeds and Yield of Dry Direct Seeded Rice to Tillage and Weed Management) ผู้เขียน:Jagat DEVI RANJIT, รังสิต สุวรรณเขตนิคม สื่อสิ่งพิมพ์:pdf AbstractThe study was initiated to assess the performance of rice (Oryza sativa) under dry direct seeded environment with two tillage systems of conventional tillage and minimum tillage and five weed management treatments namely unweeded control, handweeding twice 25 and 45 days after seeding, anilophos + one handweeding, bispyribac-sodium, and straw mulch + bispyribac-sodium as an alternate method of transplanting in the mid-hill ecology. Both anilophos and bispyribac–sodium were found to reduce narrowleaf and broadleaf weeds compared to unweeded control. However, anilophos reduced Cyperus difformis, C. sanguinolentus, and C. iria 4 weeks after seeding (WAS) but not Ammania sp. and Dopatrium junceum 8 WAS. Bispyribac–sodium and straw mulch + bispyribac-sodium reduced the population of Alternanthera philoxeroides, Ammania sp., Commelina diffusa, C. difformis, C. iria, and D. junceum 8 WAS. No phytotoxic effect on the rice plants was observed due to both herbicides. Yield and yield attributes were not affected by the tillage systems. The weed managements were found to affect the numbers of tiller per square meter and grain yield. The increasing number of weed did not affect the plant height of rice (Khumal-4). The numbers of tiller and grain yield highly affected the increasing number of weed population. Anilophos plus one handweeding, straw mulch plus bispyribac-sodium, handweeded twice and bispyribac–sodium alone gave higher yield compared to unweeded control. Promising grain yield could be achieved with the anilophos or bispyribac-sodium with additional physical or mechanical control methods in dry direct seeded rice. |
หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Performance and Competitive Ability of Rice Cultivars to Weeds Under Direct Dry Seeded Environment) ผู้เขียน:Jagat DEVI RANJIT, รังสิต สุวรรณเขตนิคม สื่อสิ่งพิมพ์:pdf AbstractEleven rice cultivars having different plant heights and grain types were evaluated for their performance and competitive ability against weeds under direct dry seeded environment in lowland field in Agronomy farm, Khumaltar, Nepal. The cultivars were tested under uncontrolled weed growth, hand weeding two at 25 and 45 days after sowing and rice straw mulch @ 4t/ha. Common weeds were Cyperus difformis, C. iria, Fimbristylis littoralis, Echinochloa colona, E. crusgalli, Paspalum distichum, Commelina diffusa, Monochoria vaginalis, Polygonum sp., Dopatrium junceum, Lindernia sp., and Eclipta prostrata. Narrowleaf weeds were the dominant species. Straw mulch suppressed 100 percent of narrowleaf weeds compared with unweeded (control) at 4 weeks after rice sowing (WAS) but the number of these weeds increased in the later stage. Dry narrowleaf weed biomass at 8 WAS was significantly less in handweeding compared to mulch and unweeded control. Two cultivars namely Pokhreli masino and NR10274-10-2-1-1 gave comparable yield in handweeding and unweeded control showing their competitiveness to weeds. These might be due to these two cultivars are taller than the others. Furthermore, Pokhreli masino has the highest leaf area index. |
 ผลงานตีพิมพ์ในวารสารวิชาการWeed Seed Bank Response to Soil Depth, Tillage
and Weed Management in the Mid Hill Ecologyผู้แต่ง:Jagat Devi Ranjit,  Dr.Rungsit Suwanmonkha, Professor , Dr.Sombat Chinawong, Associate Professor , Mrs.Sutevee Sukprakarn, Associate Professor , Mrs.ISARA SOOKSATHAN, Associate Professor, Mrs.Sunanta Juntakool, Assistant Professor, วารสาร: |
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หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Weed Seed Bank Response to Soil Depth, Tillage and Weed Management in the Mid Hill Ecology) ผู้เขียน:Jagat DEVI RANJIT, รังสิต สุวรรณเขตนิคม, ดร.สมบัติ ชิณะวงศ์, รองศาสตราจารย์, Sutevee Suprakarn, นางอิสรา สุขสถาน, รองศาสตราจารย์, นางสุนันทา จันทกูล, ผู้ช่วยศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractThe size and composition of weed seed bank was studied in the glass house based on the study initiated in the field under conventional and minimum tillage with five weed managements in wheat and dry direct seeded rice rotation at various soil depths such as 0-5 cm, 5-10 cm, 10-15 cm, and 15-20 cm. The experiments were conducted at Agronomy Farm, Khumaltar, Nepal during 2001-2003. The number of weed species was greater in weed seed bank than in the field. Eighty–one weed species belonging to 25 families were retrieved from the soil seed bank samples collected over three seasons. Dicot broadleaves ranked first in terms of number of species followed by grasses, sedges, monocot broadleaves and pteridophytes. Alopecuros aequalis, Digitaria sanguinalis, Echinochloa colona, Phalaris minor, Polypogon fugox, Cyperus difformis, C. dilutus, C. iria, C. sanguinolentus, Fimbristyllis littoralis, Chenopodium album, Coronopus didymus, Lindernia procumbens, Rumex crispus, Soliva anthemifolia, Stellaria media, S. aquatica, Commelina diffusa, Murdania sp. and Ceratopteri thalictroides were the common weeds. Vertical distribution of weed seed bank of grasses, sedges, and broadleaves showed in descending order from 5 cm to 20 cm in all season’s soil samples and the pressure of most weeds was at 5-10 cm soil depth. The total number of weeds in seed bank per square meter ranged from 6,800 to 9,500 in 0-5 cm depth. Tillage affected on grass weed seed bank but had no consistent effect on sedges and neither on broadleaves over seasons. Sulfosulfuron and fenoxaprop affected on annual grass weed seed bank but not on broadleaf by the later. ispyribac–sodium and anilophos both suppressed grass and sedge weed seed bank. Weed seed bank was influenced by management as well as soil depths. |