Utilization of Chromolaena odorata (L.) King & Robinson as a source of nutrients recycling in finger millet - groundnut system” and “Bio- efficacy of herbicides to manage Chromolaena under waste land situation
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Date
2011-06-06
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University of Agricultural Sciences GKVK, Bangalore
Abstract
Investigations were carried out on utility of Chromolaena odorata weed in finger millet- groundnut system on red sandy loam soil during 2003 – 2004 at Main Research Station, Hebbal, Bangalore, in terms of productivity, nutrient composition, maintaining soil fertility, growth, yield of crops and economics. The study comprised of eleven treatments with combinations of organic sources viz., Chromolaena odorata compost, FYM (farm yard manure), vermin-compost, cow dung slurry, microbial consortium, leaf litter, top forest soil, Glyricidia maculata and Lantana camara at 7.5 t ha-1 along with 100% recommended dose of fertilizer (RDF), RDF + FYM, RDF alone and unfertilized control. Combined application of compost of Chromolaena odorata (90%) + cow dung slurry (10%) + microbial consortium + rock phosphate (2.5 kg /ton) @ 7. 5 t ha-1 along with 100% RDF recorded higher grain/ pod yield by 1.9% - 8.0% and higher net income of Rs. 784 – Rs 3,457 ha-1 than RDF + FYM 7.5 t ha-1 in the system. Further, uses of RDF + FYM 7.5 t ha-1 and compost of Chromolaena odorata (2/3) + FYM (1/3) @ 7.5 t ha-1 + RDF were the next best treatments. Chromolaena’s composts had higher nutrient composition than FYM and can be used profitably in crops.
Another trial on bio-efficacy of herbicides to manage Chromolaena under wasteland situation was conducted at Gandhi Krishi Vigyan Kendra, Bangalore, with 18 treatments (four herbicides - glyphosate 41 SL 0.4 to 1.6 kg a.i./ ha, paraquat 24 SL 0.4 to 1.0 kg a.i./ ha, chlorimuron ethyl 10WP + metsulfuron methyl 10 WP 2.0 to 5.0 g/ ha, 2, 4-D Na salt 80 WP 1.0 to 2.5 kg a.i./ ha, manual cutting and unsprayed control). Use of paraquat at 0.4 to 1.0 kg ha-1 and glyphosate at 0.4 to 1.6 kg ha-1 caused 100% mortality without re- growth till 90 days after spraying, besides being cheaper in old existing weed and de-topped plants than manual weeding.
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