National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
A field investigation was conducted at Instructional farm of Krishi Vigyan Kendra Kendrapara, Odisha during kharif and rabi seasons of 2013-14 and 2014-15 in rice-groundnut cropping system under irrigated medium land situation. The soil of the experimental site was sandy loam in texture with pH of 5.7, organic carbon of 0.52 % having available soil nitrogen, phosphorus and potassium of 390.9 kg/ha, 10.1 kg/ha and 190.1 kg/ha respectively. Rice crop (var. Sahabhagi dhan) was transplanted in kharif season under the experiment taking nine treatments having three levels each of nutrient management and weed management practice with three replications in randomized block design. Further during rabi season each main plot was divided into two sub-plots taking groundnut (var. Devi) with two levels of weed management practices under split plot design. The results revealed that broad leaved weeds infested the rice crop to the tune of 42 %, followed by sedges (39 %) and grassy weeds (19%).The major broad leaved weeds of rice were Ludwigia parviflora and Sphenoclea zeylanica ,sedges such as Cyperus iria and Cyperus difformis and grasses like Echinocloa colona. Minimum weed density was observed rice crop in treatment of RDF (75% N) with green manuring of dhaincha (Sesbania aculeata) coupled with pre emergence application of herbicide oxadiargyl at 3 DAT followed by post emergence bispyribac-sodium at 20 DAT .Maximum weed density, weed dry matter accumulation was observed when there is application of RDF without green manuring and weedy check plot. The weed index of 49.1 % and 48.5 % was observed during 2014 and 2015 respectively from weedy check plot.
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