Vol. 11, Issue 9 (2022)

Author(s):
Adilakshmi G, Sagar GK, Chandrika V, Madhuri KVN and Umamahesh V

Abstract:
Field experiments were conducted during kharif, 2020 and 2021 at wetland farm of S. V. Agricultural College, Tirupati in split plot design and replicated thrice in order to evaluate the effect of nutrient levels and weed management practices. The treatments in main plot comprised of three nutrient levels viz., 100% RDF (N₁), 125% RDF (N₂) and 150% RDF (N₃) under main plots and five weed management practices assigned to sub plots viz., Pre emergence (PE) application of pyrazosulfuron-ethyl 25 g ha^-1 fb penoxsulam + cyhalofop-p-butyl 125 g ha^-1 at 20 DAS (W₁), Pre emergence (PE) application of pyrazosulfuron-ethyl 25 g ha^-1 fb florpyrauxifen benzyl + cyhalofop-p-butyl 150 g ha^-1 at 20 DAS (W₂), Pre emergence (PE) application of pyrazosulfuron-ethyl 25 g ha^-1 fb bispyribac-sodium 20 g ha^-1 at 20 DAS (W₃), hand weeding twice at 20 and 40 DAS (W₄) and unweeded check (W₅). The results revealed that, among different nutrient levels, 150% RDF (N₃) recorded higher grain and Straw yield and higher uptake of nitrogen, phosphorous and potassium which were significantly superior to 125% RDF (N₂) and 100% RDF (N₁) during both the years of study and in the pooled mean. With respect to different weed management practices, higher grain & Straw yield and higher uptake of nitrogen, phosphorous and potassium were observed with hand weeding twice at 20 and 40 DAS (W₄) which was comparable with PE application of pyrazosulfuron-ethyl 25 g ha^-1 fb florpyrauxifen benzyl + cyhalofop-p-butyl 150 g ha^-1 at 20 DAS (W₂) but it was superior to PE application of pyrazosulfuron-ethyl 25 g ha^-1 fb penoxsulam + cyhalofop-p-butyl 125 g ha^-1 at 20 DAS (W₁) and PE application of pyrazosulfuron-ethyl 25 g ha^-1 fb bispyribac-sodium 20 g ha^-1 at 20 DAS (W₃) with a significant disparity during both the years of investigation and in the pooled mean. Among different combinations, grain and straw yield were higher with 150% RDF coupled with hand weeding twice at 20 and 40 DAS (N₃W₄) which was comparable with 125% RDF coupled with hand weeding twice at 20 and 40 DAS (N₂W₄) and 150% RDF in combination with PE application of pyrazosulfuron-ethyl 25 g ha^-1 fb florpyrauxifen benzyl + cyhalofop-p-butyl 150 g ha^-1 (N₃W₂).