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|An experiment was conducted at Annamalai University, Experimental farm, Annamalai Nagar on the bio-efficacy of certain herbicides for controlling water hyacinth ( Eichhornia crassipes ) and its impact on fish mortality. The experiment was laid out in a randomized block design with three replications. Water hyacinth was introduced into cement tank of dimension 2ft breadth 2.5ft length and 2ft depth having th of water column. Three herbicides (Fernoxone at the rate of 1.50 kg ha -1 , Glycel and Round up at the rate of 2.50 kg ha -1 and Gramoxone at the rate of 1.50 kg ha -1 ) were tried, all are foliage applied herbicides. Spray fluid required of 500 litre ha -1 was made and applied, through knapsack sprayer fitted with flood jet deflector nozzle. In each treatment ten fish fingerlings of size of 10 cm length were introduced, three different species tested viz ., common carp, mrigal and rohu. Among the treatments, glyphosate caused maximum reduction of plant height of 0.50, 1.00 and 1.00 cm; 2.75, 6.98 and 10.00 g of biomass were obtained at 50 DAS on small, medium and large statures of E.crassipes . The cent percent chlorophyll content was recorded compared to control treatment at 28 DAS, whereas it cent percent mortality of E.crassipes at 35 DAS on small, medium and large statures of the weed. Similarly the same herbicides caused the least mortality percent of fishes 23.30, 16.60 and 20.00 on common carp, mrigal and rohu at 32 DAS respectively, compared to other herbicides treatmen|
S Deivasigamani has submitted his Ph.D. thesis at the age of 29 years from Annamalai University, Tamilnadu. He is the senior researchers of NAIP-ICAR-Research project, Department of Agronomy, Faculty of Agriculture, Annamalai University. He has published more than 7 papers in reputed journals and participated in several national and international conferences.
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