Evaluation of Weed Parameters in Rice Fallow Crops under Zero-till System with Limited Irrigation

Author: T. Kanna, B. Rajendra Kumar, A. Upendra Rao and G. Mohan Naidu

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Abstract

A field experiment was conducted in sandy loam soils to study the impact of weeds at 20, 40 and 60 DAS with limited number of irrigations in six different crops under zero till system in rice fallows during rabi, 2021-22 at Agricultural College Farm, Naira. Weeds are the major problem in rice fallows that shows direct impact on growth and yields of various fallow crops. Yield can be attained with proper management practices like hand weedings at every 15 days interval and with the irrigations that were provided to different fallow crops. The experiment was laid out in split-plot design, replicated thrice with six treatments. The weed count and weed dry weight was non-significant with number of irrigations in six fallow crops at 20 and 40 DAS. At 20 DAS weed count was highest with three irrigations (41 m-2) and gradually decreased with reduced number of irrigations and lowest with two irrigations (40.07 m-2). At 40 DAS weed count was highest with four irrigations (51.92 m-2) and lowest with two irrigations (49.64 m-2). At 20 DAS weed dry weight was highest with three irrigations (13.23 m-2) and lowest with two irrigations (12.59 m-2). At 40 DAS weed dry weight was highest with four irrigations (26.08 m-2) and lowest with two irrigations (25.46 m-2). Significant difference was recorded in weed count and weed dry weight at 60 DAS. The interaction effect of weed count and weed dry weight at 60 DAS was significant with number of irrigations in six fallow crops.

Keywords

Limited irrigation, Rice fallows, Zero-till system

Conclusion

Among six fallow crops significantly higher weed counts and dry weight was observed in Maize followed by Sorghum. Conspicuously weed count and dry weight was low with Sunhemp and Blackgram due to more weed suppression and smothering ability of Sunhemp and Blackgram compared to erect growing crops Maize and Sorghum. Better management of weeds in fallow crops by hand weedings at 15 days interval and with suitable recommended chemical sprayings will enhance and improve the overall production and productivity of the system.

References

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How to cite this article

T. Kanna, B. Rajendra Kumar, A. Upendra Rao and G. Mohan Naidu (2022). Evaluation of Weed Parameters in Rice Fallow Crops under Zero-till System with Limited Irrigation. Biological Forum – An International Journal, 14(4): 1203-1208.