Effect of integrated weed management on weed dynamics and nutrient uptake by weeds in rice crop

Abstract

A field experiment was conducted in rice during kharif season of 2013 on sandy loam soil at Crop Research Centre, Chirauri of Sardar Vallabhbhai Patel University of Agriculture & Technology, Meerut (U.P.).The experiment was conducted in R.B.D with three replications comprising twelve treatments of weed management (weedy check, weed free Pretilachlor, Pretilachlor+1Handweeding, Pyrazosulfuron+Almix, Azimsulfuron, Orthosulfuron, Pyrazosulfuron, Bispyribac-Na, Butachlor, Fenoxaprop ethyl, Almix. The soil of experimental field was sandy loam in texture, low in organic carbon and available nitrogen, medium in available phosphorus and available potassium with near to neutral in reaction. The results indicated that herbicide combination methods of weed control significantly reduced the weed population and dry weight effectively over weedy check. The minimum weed index and maximum weed control efficiency were recorded with the application of Pretilachlor+1Hand weeding than other treatments. The nitrogen, phosphorus and potash uptake by weeds reduced significantly by the application of Pretilachlor+1Hand weeding than other chemical treatments.