Evaluation of long term trial on weed dynamics in mono or double cropped rice system under different establishment methods

Abstract

India has a wide range of agro climates and soil types. The highly diverse agriculture and farming systems are beset with different types of weed problems. Weeds reduces 10-80% crop yield, impairing, product quality and causes health and environmental hazards. Weeds are a major constraint to agriculture, forestry and aquatic environment. A field experiment was laid out at Crop Research Station, Ghaghraghat, (ANDUAT), Bahraich, U.P. to evaluate long term trial on weed dynamics in mono or double cropped rice system under different establishment methods. The treatments consisted of 3 main plots M1 – Mechanised planting/transplanting, M2 – Puddled direct seeding, M3 – Unpuddled dry direct seeding and four sub plots T1 – Weed free, T2 – Weedy check, T3 – Mechanical weeding using weeder and T4 – Chemical weed control of pre and post emergence herbicide application. NDR 359 medium duration rice variety was sown in spilt plot design with three replications. The results revealed that the grain yield loss was found 3.22% in mechanical weeding using weeder followed by chemical weed control (pre & post emergence herbicide application) 15.96%. The highest grain yield was found in weed free of M1 –Transplanting, (4.08 t/ha) followed by M2 – Puddled direct seeding (3.22t/ha). The study showed that yield of rice increased under transplanting along with mechanical weeding using weeder.