Vol. 16 No. 2
Assessment of seed rain of matured Parthenium hysterophorus L. with glyphosate application
Author(s): K. KALAICHELVI
Abstract: Parthenium hysterophorus L., an obnoxious invasive weed is posing a severe threat to biodiversity and also reduces yield in different field crops and is a prolific seed producer. A field experiment was conducted to study is glyphosate and combined application of glyphosate with chlorimuron ethyl 9 g ha-1 have any control on Parthenium seeds if it is applied at maturity stage. Complete drying was observed on 10 DAHS with glyphosate spraying at 10 ml/litre whereas, complete drying was observed only at 15 – 20 DAHS with glyphosate + chlorimuron ethyl 9g ha-1. P. hysterophorus plants were germinated at higher rate and earlier in glyphosate applied plot; when compared to hand weeded plot and unweeded plots. This might be due to the fastened maturity of seeds or early senescence of Parthenium. Weed seed bank assessment at 0-15 cm depth revealed that glyphosate application has recorded more number of Parthenium emergence under pot culture and field condition when compared to its combination with chlorimuron ethyl at 9g ha-1. Uprooting is found to be successful technology if the Parthenium is at maturity phase as it resulted in Zero (0) seedling emergence under field condition. To confirm weed seeds are not killed due to glyphosate application, weed seeds were collected form the glyphosate applied treatments and raised under microplot condition. Seeds expressed 95 per cent germination which showed that glyphosate application has no check on weed seeds and its viability.
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