Tank mix application of cyhalofop-butyl with selected herbicides for weed control in wet seeded rice (Record no. 154735)
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| 000 -LEADER | |
|---|---|
| fixed length control field | 04944nam a22002057a 4500 |
| 003 - CONTROL NUMBER IDENTIFIER | |
| control field | OSt |
| 005 - DATE AND TIME OF LATEST TRANSACTION | |
| control field | 20220422154524.0 |
| 008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION | |
| fixed length control field | 220422b ||||| |||| 00| 0 eng d |
| 082 ## - DEWEY DECIMAL CLASSIFICATION NUMBER | |
| Classification number | 630 |
| Item number | ATH/TA |
| 100 ## - MAIN ENTRY--PERSONAL NAME | |
| Personal name | Atheena A |
| 245 ## - TITLE STATEMENT | |
| Title | Tank mix application of cyhalofop-butyl with selected herbicides for weed control in wet seeded rice |
| 260 ## - PUBLICATION, DISTRIBUTION, ETC. (IMPRINT) | |
| Place of publication, distribution, etc. | Vellanikkara |
| Name of publisher, distributor, etc. | Department of Agronomy, College of Horticulture |
| Date of publication, distribution, etc. | 2016 |
| 300 ## - PHYSICAL DESCRIPTION | |
| Extent | 101 pages |
| 502 ## - DISSERTATION NOTE | |
| Dissertation note | MSc |
| 520 3# - SUMMARY, ETC. | |
| Summary, etc. | Herbicidal weed control is very common in rice cultivation. Application of pre- emergence and post emergence herbicides or two post emergence herbicides as follow up sprays is usually recommended to take care of diverse weed flora in rice. As this increases the cost incurred in spraying, farmers prefer single spray of a mixture of herbicides or a broad spectrum herbicide. Cyhalofop-butyl is a common cost effective post emergence selective herbicide that controls grass weeds, especially the rice associated weed Echinochloa spp. and Leptochloa chinensis. The present study was carried out to study the efficacy and economics of tank mix application of cyhalofop-butyl with selected herbicides (pre emergence, post emergence and early post emergence) and to study the response of weed flora to tank mix application. A field experiment was conducted in Alappad kole lands from September 2015 to January 2016, using the rice variety Uma (MO-16). There were a total of 16 treatments replicated thrice. Almix® [chlorimuron-ethyl (10%) + metsulfuron-methyl (10%)], ethoxysulfuron, carfentrazone-ethyl, pyrazosulfuron-ethyl, pretilachlor, pendimethalin were tank mixed with cyhalofop-butyl and were also applied as follow up sprays, two days after cyhalofop-butyl application. For better comparison, sole application of cyhalofop-butyl, as well as a broad spectrum post emergence herbicide, bispyribac sodium, were also included apart from hand weeded and unweeded controls. Pre emergence herbicides were sprayed at six days after sowing (DAS), and early post emergence herbicide at 10 DAS. All tank mix herbicide applications were done at 18 DAS and follow up post emergence herbicide applications at 20 DAS (i.e., two days after the application of cyhalofop-butyl). Hand weeding was carried out at 20 DAS and 40 DAS. The data on weed spectrum revealed that broad leaf weeds and grasses were dominant and at 30 DAS they constituted 47 per cent and 46 per cent of the population respectively, whereas sedges constituted only 7 per cent. Echinochloa stagnina was the dominant grass and Monochoria vaginalis, the dominant broad leaf weed. Among tank mix applications of herbicides, cyhalofop-butyl + pyrazosulfuron-ethyl recorded the least weed dry matter production while among various sequential application of herbicides, the lowest weed dry matter accumulation was noted in cyhalofop-butyl followed by (f.b.) Almix® and both were statistically comparable. Among various herbicides and herbicide mixtures, both tank mix and sequential applications of carfentrazone-ethyl caused severe phytotoxicity in rice. However, the crop recovered by seven days after spraying and plant growth parameters were not affected with all the treatments registering comparable plant height at all stages. At both 30 DAS and 60 DAS, hand weeded treatment registered the highest tiller count. However, this was on par with bispyribac sodium, pyrazosulfuron-ethyl + cyhalofop-butyl and cyhalofop-butyl f.b. Almix®. Highest and statistically superior grain yield was registered in hand weeded treatment. Application of cyhalofop-butyl + pyrazosulfuron-ethyl and bispyribac sodium were the next best treatments with respect to grain yield and were superior to all other treatments. Except for pyrazosulfuron-ethyl all other herbicides resulted in lower grain yields when tank mixed with cyhalofop-butyl with weed index in the range of 13to 18 per cent and weed control efficiency in the range of 61 to 76 per cent (at 30 DAS). Application of follow up sprays of herbicides for control of broad leaf weeds after cyhalofop-butyl resulted in grain and straw yields comparable to that of single application of bispyribac sodium, which recorded a higher B:C ratio of 2.4. From this study it can be concluded that tank mix application of cyhalofopbutyl with pyrazosulfuron-ethyl at 18 DAS can be recommended for effective control of mixed weed flora in wet seeded rice as this treatment resulted in the highest B:C ratio (2.5) as well as net returns. It is not advisable to go for tank mixing of cyhalofop-butyl with Almix® as it will lead to complete loss of activity of cyhalofopbutyl. Tank mixing of pre emergence herbicides with cyhalofop-butyl was found to be less effective than their sequential application. |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name as entry element | Agronomy |
| 700 ## - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Prameela P (Guide) |
| 856 ## - ELECTRONIC LOCATION AND ACCESS | |
| Uniform Resource Identifier | http://krishikosh.egranth.ac.in/handle/1/5810031023 |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) | |
| Source of classification or shelving scheme | |
| Koha item type | Theses |
| Withdrawn status | Lost status | Damaged status | Not for loan | Collection code | Permanent Location | Current Location | Shelving location | Date acquired | Full call number | Barcode | Date last seen | Price effective from | Koha item type |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Not For Loan | Reference Book | KAU Central Library, Thrissur | KAU Central Library, Thrissur | Theses | 2017-02-14 | 630 ATH/TA | 173681 | 2017-02-14 | 2017-02-14 | Theses |