COMPARATIVE EFFICACY OF HERBICIDES IN WEED CONTROL AND ENHANCEMENT OF PRODUCTIVITY AND PROFITABILITY OF RICE
| Autor: | K. B. Pun, Priyanka Gautam, Teekam Singh, Kanchan Saikia, Bhawani Shankar Satapathy, Banwari Lal, Upendra Kumar |
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| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
Biomass 04 agricultural and veterinary sciences Biology Weed control 01 natural sciences Biomass carbon chemistry.chemical_compound Productivity (ecology) Agronomy chemistry 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Grain yield Soil enzyme Weed Agronomy and Crop Science Butachlor 010606 plant biology & botany |
| Zdroj: | Experimental Agriculture. 54:363-381 |
| ISSN: | 1469-4441 0014-4797 |
| DOI: | 10.1017/s0014479717000047 |
| Popis: | SUMMARYWeed management is the major challenge to the success of boro rice (rice grown during Dec–Jan to May–Jun, also known as summer rice) in Southern Asia. Herbicide seems to be a cost effective and strategic tool from an agronomic view point to control weeds; however, herbicide application can potentially interfere with soil enzyme activity and microbial biomass carbon (MBC). A field study was conducted in 2012/13 and 2013/14 to evaluate the performance of sole and combined application of different pre-emergence herbicides in comparison to manual weeding in boro rice. Lowest weed density, biomass and highest weed control efficiency (~83%) were recorded with the pyrazosulfuron ethyl, causing higher grain yield (6.7 Mg ha−1 in 2012/13 and 4.5 Mg ha−1 in 2013/14) than treatments with chlorimuron + metsulfuron-methyl, bensulfuron methyl + pretilachlor, butachlor fb 2,4D, butachlor and cono-weeder. Among, the herbicidal treatments butachlor caused lower grain yield and higher weed density and biomass when compared to the others. Although grain yield was highest in weed-free treatments but net returns and (B:C) benefit cost ratio was highest for pyrazosulfuron ethyl due to high cost of hand weeding. After 15 days of herbicide application, lowest microbial biomass carbon was recorded with bensulfuron methyl + pretilachlor, whereas lower values of dehydrogenase and fluorescein diacetate activities were observed with the application of chlorimuron + metsulfuron-methyl at 15 days after herbicide application. Our results suggest that pyrazosulfuron ethyl is one broad-spectrum and economically effective herbicide for controlling weeds as an alternative to labour consuming hand weeding in boro rice cultivation. |
| Databáze: | OpenAIRE |
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