WEED MANAGEMENT IN MAIZE (Zea mays L.)
| dc.contributor.advisor | Yadava, M. S. | |
| dc.contributor.author | DEWANGAN, PRADEEP KUMAR | |
| dc.date.accessioned | 2017-06-12T11:00:31Z | |
| dc.date.available | 2017-06-12T11:00:31Z | |
| dc.date.issued | 2016 | |
| dc.description | WEED MANAGEMENT IN MAIZE (Zea mays L.) | en_US |
| dc.description.abstract | Maize (Zea mays L.) is the 3rd most important staple food of world population after wheat and rice. A high level of weed infestation poses a major problem in kharif maize. Weeds being a serious negative factor in crop production are responsible for marked loss (28-68.9%) in maize yield. Therefore, weed control plays an important role in maize production to achieve a desired level of yield. Keeping these points in view, an experiment entitled “Weed management in maize (Zea mays L.)” was conducted at BAU experimental Farm, (Kanke), Ranchi, Jharkhand during kharif season 2015 on sandy clay loam soil with low organic carbon (4.25 g/kg), moderately acidic (pH 5.7) in nature, low available nitrogen (263.07 kg/ha), medium potassium (176.96 kg/ha) and high phosphorus (28.42 kg/ha). The experiment was laid out in a RBD with 13 treatments: atrazine 0.5 + pendimethalin 0.5 kg/ha PE (T6), two hand weeding at 20 and 40 DAS (T12), two mechanical weeding at 20 and 40 DAS (T11), atrazine 1.0 kg/ha PE (T2), pretilachlor 0.5 + metribuzin 0.175 kg/ha PE (T5), metribuzin 0.35 kg/ha at 15 DAS (T8), pendimethalin 1.0 kg/ha PE (T3), atrazine 1.0 kg/ha at 15 DAS (T9), metribuzin 0.35 kg/ha PE (T4), pretilachlor 1.0 kg/ha PE (T1), pretilachlor 1.0 kg/ha at 15 DAS (T7), green manuring by Sesbania @ 80 kg/ha fb 2, 4-D 0.625 kg/ha at 30 DAS (T10) and weedy Check (T13), replicated thrice. Maize var. Suwan was sown (on 30- 06-2015) with spacing of 70 x 20 cm, seed rate 20 kg/ha and RDF 120:60:40 kg/ha. Results revealed that application of atrazine 0.5 + pendimethalin 0.5 kg/ha PE significantly reduced weed density at 30 and 60 DAS up to 96.07% (11.67/m2) and 76.39% (124.33/m2), respectively as compare to weed density in rest of the treatments except hand weeding as well as mechanical weeding at 20 and 40 DAS. It also recorded significant reduction in total weed dry matter (9.27 and 15.09 g/m2) and maximum WCE (96.33% and 94.50%) at 30 and 60 DAS, respectively over rest of the treatments. Crop growth parameters namely plant height & dry matter production of maize crop were maximum at 60, 90 DAS and maturity with the application of atrazine 0.5 + pendimethalin 0.5 kg/ha PE where leaf area index was also recorded significantly maximum at 60 (LAI 2.77) and 90 DAS (LAI 3.95). Same weed control method (atrazine 0.5 + pendimethalin 0.5 kg/ha PE) showed higher crop growth rate, relative growth rate and net assimilation rate at all growth stages. Reduction in yield was 43.61 % in weedy check plot (2843 kg/ha) compare to best weed control method T6 - atrazine 0.5 + pendimethalin 0.5 kg/ha PE (5059 kg/ha). Yield attributes namely no. of cobs/ha (70540/ha) and no. of row/cob (13.73), gross return (70591 `/ha), net return (44623 `/ha) and B:C ratio (1.72) were observed maximum due to application of same treatment (atrazine 0.5 + pendimethalin 0.5 kg/ha PE). Population of soil microbial biomass (fungi, bacteria and Actinomycetes) was at par in all the weed control methods (chemical, mechanical and hand weeding). The cost of treatment (atrazine 0.5 + pendimethalin 0.5 kg/ha PE) is much lower (1768 `/ha) against mechanical weedings (3749 `/ha) and hand weedings (9372 `/ha). It can be summarized that weed density and weed dry matter were significantly reduced by application of atrazine 0.5 + pendimethalin 0.5 kg/ha PE where maximum weed control efficiency was upto 97%. This weed control method recorded significantly higher vegetative growth parameters at all stages and also maximum yield & yield attributes in kharif maize (var. Suwan). Population of soil microbial biomass (fungi, bacteria and Actinomycetes) were not significantly affected by different weed management practices. Based on the results of present investigation, it can be concluded that application of atrazine 0.5 + pendimethalin 0.5 kg/ha PE can be recommended as an economical weed management practice in kharif maize for obtaining higher productivity. | en_US |
| dc.identifier.uri | http://krishikosh.egranth.ac.in/handle/1/5810019606 | |
| dc.keywords | WEED MANAGEMENT IN MAIZE (Zea mays L.) | en_US |
| dc.language.iso | en_US | en_US |
| dc.pages | 87 | en_US |
| dc.publisher | Birsa Agricultural University, Kanke, Ranchi, Jharkhand | en_US |
| dc.sub | Agronomy | en_US |
| dc.subject | null | en_US |
| dc.theme | WEED MANAGEMENT IN MAIZE (Zea mays L.) | en_US |
| dc.these.type | M.Sc | en_US |
| dc.title | WEED MANAGEMENT IN MAIZE (Zea mays L.) | en_US |
| dc.type | Thesis | en_US |