Sathyanarayana Reddy, Dr. B.MURGOD, MAHANTESH I.2019-09-172019-09-172001-08-13Th-6169http://krishikosh.egranth.ac.in/handle/1/5810128555A field experiment was carried out to study the effects of different weed control treatments in China aster (Callistephus chinensis Nees.) cv. Kamani, at the experimental field of Department of Floriculture and Landscape Gardening, Kittur Rani Channamma College of Horticulture, Arabhavi during 1999-2000. The experiment consisted of twenty treatments, consisting of two herbicides (pendimethalin and alachlor), hand weeding and wheat husk as mulch.These were considered alone or in various combinations and v;ere compared with unweeded control. The experiment was laid out in randomised block design (RBD) with three replications. Growth parameters, viz., plant height, number of leaves, number of branches and dry weight of plant were higher in weed free treatment throughout the crop period and in Integrated weed management treatments having either pendimethalin 1.50 kg a.e. ha'^ or alachlor 2.00 kg a.e. ha"^ along with wheat husk as mulch or manual weeding at 30 DAT. The highest yield of quality flowers were recorded in weed free treatment throughout the crop period and in integrated weed management treatments having either pendimethalin 1.50 kg a.e. ha ^ or alachlor 2.00 kg a.e. ha"^ along with wheat husk as mulch or manual weeding at 30 DAT. Weed control efficiency was high in weed free treatment throughout the crop period and with application of pendimethalin 1.5 kg a.e. ha"^ + wheat husk and alachlor 2.0 kg a.e. ha"^ + wheat husk. But application of pendimethalin 1.5 kg a.e. ha'^ and alachlor 1.00 and 2.00 kg a.e. ha"'' showed slight to moderate toxicity on China aster. Net retums and marginal returns were maximum in weed free treatment throughout the crop period. Among the treatments having herbicides, integrated weed management treatments having either pendimethalin 1.50 kg a.e. ha" or alachlor 2.00 kg a.e. ha"' along with wheat husk as mulch or manual weeding at 30 DAT resulted in the highest net and marginal retums.ennullThesis