ASSESSMENT OF CROP ESTABLISHMENT METHODS AND WEED MANAGEMENT PRACTICES IN DIRECT SEEDED RICE (Oryza sativa L.)
KrishiKosh
View Archive InfoField | Value | |
Title |
ASSESSMENT OF CROP ESTABLISHMENT METHODS AND WEED MANAGEMENT PRACTICES IN DIRECT SEEDED RICE (Oryza sativa L.)
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Creator |
SAMIR, PURTY
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Contributor |
MOSHA, K
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Subject |
weeds, sowing, control methods, rice, crops, planting equipment, developmental stages, yields, seed drilling, grain
WEED MANAGEMENT, SEEDED RICE (Oryza sativa L.) |
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Description |
A field experiment entitled “Assessment of crop establishment methods and weed management practices in direct seeded rice (Oryza sativa L.)” was conducted at Agricultural College Farm, Bapatla on sandy loam soil during the late kharif 2010-11. The treatments consisted of three crop establishment methods viz., drum seeding in puddled condition, drilling in friable soil and transplanting assigned to main plots and four weed management practices viz., weedy check, hand weeding at 20 and 40 DAS, bispyribac @ 30 g a.i. ha-1 at 15 DAS and bispyribac @ 30 g a.i. ha-1 at 15 DAS fb ethoxysulfuron @ 20 g a.i. ha-1 at 30 DAS to sub plots. The designed adopted was in split-plot with three replications. Weed density was significantly the lowest with transplanting method over drilling but it was on par with that of drum seeding method of crop establishment. Among weed management practices, the lowest weed density was recorded with sequential application of bispyribac-sodium and ethoxysulfuron which was significantly superior over application of bispyribac alone. However, it remained at par with hand weeding. Similar trend was observed at all the stages of crop growth. The minimum weed drymatter observed with the transplanting was significantly lower than that of drilling and drum seeding throughout the growth period. Weed drymatter recorded in drilling was significantly higher than that of other establishment methods at maturity. Application of bispyribac along with ethoxysulfuron reduced the drymatter significantly over the application of bispyribac alone at maturity. The highest weed control efficiency was recorded with hand weeding and it was significantly superior to all other treatments. Significantly higher weed control efficiency was recorded with sequential application of bispyribac-sodium and ethoxysulfuron over the application of bispyribac-sodium alone. The taller plants were observed with transplanting method which was significantly superior to that of drum seeding and drilling. Significantly the tallest plants were recorded with sequential application of herbicides and it was on a par with hand weeding. More number of tillers was recorded under transplanting which was at par with drum seeding at maturity. However, number of tillers under drum seeding and drilling did not differ statistically at 80 DAS/T and maturity. The highest number of tillers under hand weeding recorded was significantly superior to rest of weed management treatment. The treatment W3 and W4 were at par with each other and recorded significantly higher number of tillers over weedy check at all stage of crop growth. All the weed management practices were found to be on a par with each other and accumulated significantly more drymatter over weedy check under transplanting. However, application of bispyribac along with ethoxysulfuron found superior to application bispyribac-sodium alone but remained at par with hand weedings. Number of productive tillers recorded with transplanting was significantly higher than drum seeding and drilling. The lowest number of productive tillers recorded with drilling was, however, on a par with drum seeding. Similarly, transplanting recorded with significantly higher number of grains per panicle and more test weight over drum seeding and drilling. Among the weed management practices, the maximum numbers of productive tillers, grains per panicle and test weight were noticed in hand weeding twice followed by sequential application of bispyribac-sodium and ethoxysulfuron and the lowest were recorded by bispyribac- sodium alone. The highest grain and straw yields were recorded with transplanting followed by drum seeding and the least was recorded with drilling Transplanting was found to be significantly superior to both the methods of sowing. However, grain and straw yields under drilling and drum seeding methods did not differ significantly. The maximum grain and straw yields were recorded by hand weeding while the minimum grain and straw yields were recorded by the weedy check. Sequential application of herbicides was found better in increasing the yields significantly than the application of bispyribac-sodium alone. Transplanting found profitable compared with drilling and drum seeding. Among the direct seeding methods, the maximum gross return, net return and returns per rupee invested were obtained from drum seeding over drilling. From the present investigation, it can be concluded that, though transplanting is superior to other methods, direct seeding by drum and drill can be recommended under non-availability of labour and to reduce cost of cultivation. Sequential application of bispyribac-sodium and ethoxysulfuron emerged as a suitable and effective early post emergence herbicide in transplanted as well as in direct seeded rice. |
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Date |
2016-06-03T09:23:03Z
2016-06-03T09:23:03Z 2011 |
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Type |
Thesis
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Identifier |
http://krishikosh.egranth.ac.in/handle/1/66675
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Language |
en
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Relation |
D9015;
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Format |
application/pdf
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Publisher |
ACHARYA N. G. RANGA AGRICULTURAL UNIVERSITY
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