MADRAS AGRICULTURAL JOURNAL

Effect of Weed Management Practices on Growth and Yield of Machine Transplanted Rice

Abstract

                                A field experiment was conducted at Wetland farms of Tamil Nadu Agricultural University, Coimbatore to evaluate the different weed management practices on growth and productivity of rice variety CO 51 during late Samba, 2017-18. The experiment consisted of eight treatments viz., Unweeded check (T1); Pretilachlor @ 1 kg a.i. ha-1 (PE) followed by hand weeding at 20 DAT (T2); Pretilachlor @ 1 kg a.i. ha-1 (PE) followed by Metsulfuron methyl + Chlorimuron ethyl @ 4 g a.i. ha-1 (POE) at 20 DAT (T3), Pretilachlor @ 1 kg a.i. ha-1 (PE) followed by Power weeder at 20 DAT (T4); Pretilachlor @ 1 kg a.i. ha-1 (PE) followed by Power weeder at 20 and 35 DAT (T5); Pretilachlor @ 1 kg a.i. ha-1 (PE) followed by Power weeder at 20, 30 and 40 DAT (T6); Power weeder at 20 and 35 DAT (T7); Power weeder at 20, 30 and 40 DAT (T8). The experiment was conducted in RCBD and replicated thrice. The results revealed that the application of Pretilachlor combined with either hand weeding on 20 DAT (T2) or with power weeding twice (T5) or thrice (T6) or with chemical combinations had registered more LAI, drymatter production, number of tillers m-2, resulted more productive tillers m-2, filled grains panicles-1, panicle length which ultimately resulted in higher grain and straw yields.

Key words : Growth parameters, Machine transplanted rice, Weed management, Yield.

Copyright @ 2019 Madras Agricultural Journal | Developed by Crystalpro All right reserved.

to increase the postharvest life. AIB is an ethylene biosynthesis inhibitor which inhibits the ethylene synthesis by inhibiting ACC oxidase enzyme. Banana fruits were treated with different AIB concentrations (50, 100, 150, 200 ppm along with control) and spraying methods (Dipping and Spraying). AIB @ 150 ppm dipped for 5 minutes showed decreased finger dislodge from the hands (50-70 per cent at 11th day after treatment) compared to control fruits (100 per cent at 9th day after treatment). On comparing AIB with ethylene inhibitor (1-MCP) and chemicals (Hexanal and calcium chloride) under cold and ambient storage condition, AIB showed better result with reduced finger drop. At 11th day of cold storage AIB treated fruits exhibited minimum finger drop of 50 per cent followed by 1-MCP vaporization with finger drop percentage of 60 and control fruits reported the maximum number of finger drop (90 per cent). Under ambient condition at 7th day itself the AIB treated fruits showed 60 per cent finger drop. Hence from the present study, the external temperature would alter the storage life of the fruits which may be an important factor and noted for further improvement of postharvest life of fruits by storing under required temperatures and minimizing the postharvest losses.

Key words : : Weak neck, α- Amino isobutyric acid, Storage condition.

Copyright @ 2019 Madras Agricultural Journal | Developed by Crystalpro All right reserved.

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  • Copyright @ 2019 Madras Agricultural Journal | Developed by Crystalpro All right reserved.