1Department of Agronomy, Pandit Jawaharlal Nehru College of Agriculture & Research Institute, Karaikal, Puducherry UT, 609603, India
2Department of Soil Science & Agricultural Chemistry, Pandit Jawaharlal Nehru College of Agriculture & Research Institute, Karaikal, Puducherry UT, 609603, India
*Corresponding author email: psaravanane@pajancoa.ac.in
Online Published on 22 August, 2024.
Field experiments were conducted during 2021 and 2022 with twelve treatments on sandy clay loam soil in randomized block design (RBD), replicated thrice. The treatment consisted of rice co-culture with Sesbania bispinosa (Sesbania) and applied with different formulations of 2,4-D sodium salt, ethyl-ester and amine at varied levels (0.50, 0.75 and 1.0 kg/ha), hand weeding twice, weed free and unweeded control. Application of 2,4-D ethyl-ester 1.0 kg/ha proved effective in weed management by exhibiting significantly lower densities of grass (70.7/m2), sedges (14.7/m2), and broad-leaved weeds (0.0/m2) with higher weed control efficiency of 74.3% at 60 DAS. Brown manuring through application of 2,4-D ethyl-ester 1.0 kg/ha led to higher grain yield (3.62 t/ha) and B:C ratio (2.03) and it was followed by 2,4-D sodium salt 1.0 kg/ha. Therefore, 2,4-D ethyl-ester 1.0 kg/ha can be recommended for effective brown manuring and eco-friendly weed management in rice, which would provide higher rice grain yield and B: C ratio. The next best treatment was rice co-culture with dhaincha and applied with 2,4-D sodium salt 1.0 kg/ha in wet seeded rice of deltaic coastal ecosystem.
Wet seeded rice, Brown manuring, Sesbania, 2,4-D formulations
