Integrated Weed Management in Maize
| dc.contributor.advisor | A.Quayum | |
| dc.contributor.author | Rakesh Kumar Singh | |
| dc.date.accessioned | 2024-07-03T06:58:17Z | |
| dc.date.available | 2024-07-03T06:58:17Z | |
| dc.date.issued | 1997 | |
| dc.description.abstract | Maize (Zea mays L.) is an important cereal after rice and wheat in India as well as in Bihar. The productivity of maize in Bihar was 18.44 quintal ha-1 with respect of wheat (18.16 gha-1) and rice (9.30 qha-1) in 1993. Besides use as food material it has myriads industrial uses. As maize being a heavy feeder and responsive to nutrients, weeds not only reduces the nutrients but grain yield also followed by lower net profit. With a view to lower the cost of cultivation in maize production in which about 25 per cent cost is involved in weed management, integrated approach towards weed control can be a solution. Because intensive herbicides applications were harmful to environment whereas manual weeding was costly operation, the integrated approach of weed control method was done. Considering the views in mind a field trial on the topic "Integrated weed management in maize" was conducted at Birsa Agricultural University Farm, having soil texture sandy loam, soil pH (5.3), organic carbon (0.472%) and medium in soil fertility. Weedy check; 3 hand weedings 15, 30 and 40 DAS; pre emergence atrazine @ 0.5 kg a.i ha-1 + one hand weeding 20 DAS, pre-emergence atrazine @ 0.5 kg a.i ha-ยน + 2, 4-D @ 0.5 kg a.i ha 1 post-emergence 20 DAS; Pre-emergence atrazine @ 1.0 kg a.i ha post-emergence 2, 4-D @ 0.5 kg a.i ha 15 DAS+ one hand weeding 20 DAS: post-emergence 2, 4-D 1.0 kg a.i ha 20 DAS: pre-emergence pendimethalin @ 0.5 kg ai ha-1 + post-emergence 2, 4-D 0.5 kg a.i ha-1 20 DAS: pre-emergence pendimethalin @ 0.5 kg a.i ha-1 + one hand weeding 20 DAS and pre-emergence pendimethalin e 1.0 kg a.1 ha-1 in randomised block design with 10 treatments replicated four times were undertaken to see the different weed flora emergence after different weed control treatments, to ascertain economic agronomic practices and to observe harmful effect of herbicides if any on microbial population. Altogeather 11 to 12 weed flora emerged in maize at 15, 30, 45, 6 DAS and at harvest weeds like Echinochloa colonum Cynodon dactylon, Cyperus rotundus and Dactyloctenium aegyptium were recorded at all periods in all the treatments except Echinochloa colanum was absent in the treatment receiving pre emergence atrazine @ 1.0 kg a.1 ha-1 at 45 DAS. Density of Dactyloctenium aegyptium L. (34.8 m2) was maximum at harvest. Density of grasses and sedges were less in atrazine and pendimethalin treated plots but broad leaved weeds were found suppressed in 2, 4-D teated plot. Weed dry weight was minimum in herbicide treated plot or in hand weeding treated plot. Maximum weed control efficiency was recorded in three hand weedigs treated plot at 45 DAS. In , latter days, at 45 and 60 DAS and at harvest weed dry weight were . increasing in order in all the treatments. Effect of herbicides in reducing microbial population was observed temporarily for certain periods. Again they (bacteria fungi and actinomycetes) recovered their population at harvest. Number of grains per cob, No. of cobs per plant, grain and staver yield were significantly influenced by weed control treatments. Maximum grain yield and maximum net profit was found in pre-emergence pendimethalin @ 0.5 kg a.i ha-1 + one hand . weeding 20 DAS treated plot. Statistically similar net profit was recored in the treatment receiving pre-emergence atrazine @ 1.0 kg a.i ha-1. Higher benefit cost ratio and higher monetary use efficiency were observed in pre-emergence atrazine @ 1.0 kg a.i -- ha-1 treated plot. The treatment receiving pre-emergence atrazine e 0.5 kg a. ha-1 + one hand weeding 20 DAS was the best choice . in per cent increase in yield over control. The minimum value of grain yield, gross income, net profit, benefit cost ratio and monetary use efficiency was found in weedy check (control plot). | |
| dc.identifier.uri | https://krishikosh.egranth.ac.in/handle/1/5810211395 | |
| dc.language.iso | English | |
| dc.pages | 85 | |
| dc.publisher | Birsa Agricultural University, Ranchi | |
| dc.sub | Agronomy | |
| dc.theme | Integrated Weed Management in Maize | |
| dc.these.type | M.Sc | |
| dc.title | Integrated Weed Management in Maize | |
| dc.type | Thesis |