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Department of Agronomy, S.V. Agricultural College, ANGRAU, Tirupati-517502.
A field experiment was conducted to investigate the residual effect of nutrient and weed dynamics imposed to preceding direct seeded rice on succeeding blackgram at wetland farm of S. V. Agricultural College, Tirupati during kharif 2020 and 2021 and rabi 2020-21 and 2021-22 was laid out in a split plot design with three replications. There were three main plots comprising of viz., 100 % RDF (N1), 125% RDF (N2) and 150% RDF (N3) and five 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 florpyrauxifenbenzyl + 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). From this experiment, it was revealed that there were no phytotoxicity symptoms on direct seeded rice and no residual effect on succeeding blackgram in terms of germination percentage, plant height, leaf area index and dry matter production. Therefore, it can be concluded that all the nutrient and weed dynamics were found to be safe and minimal impact on succeeding blackgram and suitable for rice based cropping systems.
KEYWORDS: Direct seeded rice, Weed management practices, Residual effect, Phytotoxicity, Germination percentage.