Weed Dynamics in Maize (Zea mays L.) as Influenced by Pre and Post-emergence Herbicides under Temper

During the main cropping seasons of 2017 and 2018 at the Dryland (Karewa) Agriculture Research Station, SKUAST-K, field experiments were carried out in 2017-18 to determine the impact of various post- and pre-emergence herbicide applications on weed dynamics in maize (Zea mays L.). The experiment was laid out with four replications in a randomised block configuration and Bio-605 was the variety used. Five treatments Five treatments were used, namely, Atrazine 50 percent WP @ 1.0 kg ha-1 as pre-emergence and Paraquat dichloride 24 percent SL @ 0.5 kg ha-1, 2,4-D sodium salt 58 percent WSC @ 1.0 kg ha-1 as post-emergence herbicides (application at 2-3 leaf level of weeds), hand weeding as normal control and weedy control. It was found that the impact of various herbicides on weed density was significant. No weed has been reported in plots controlled by hand weeding. The pre-emergence of Atrazine treated plots @ 1.0 kg ai ha-1 had a weed population of 5.51, 5.4, 3.73, 5.12, 4.28 and 41.4m-2 respectively in Echinochloa spp., Eleusine indica, Digitaria sanguinalis, Amaranthus viridis, Sorghum halepense and Cyperus spp., respectively. However, the maximum weed population was registered at 21.54 m-2, 20.87 m-2, 19.16 m-2, 21.5 m-2, 16.7 m-2 and 60.7 m-2 in a weedy search. There was no major difference between paraquat dichloride 24% SL @ 0.5 kg ai ha-1 and 2,4-D sodium salt 58% WSC @ 1.0 kg ai ha-1 with the exception of Cyperus spp. 51.37 m-2 and 43.04 m-2 respectively in mass. In this analysis, the ability of atrazine to control weeds and thus increase maize yield was discovered.

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