Studies on Impact of Weed Management Practices on Nutrient Removal by Weeds and Nutrient Uptake by Irrigated Sunflower (Helianthus annuus L.)

Field experiment was conducted at Annamalai University experimental farm, Annamalainagar to find out the impact of weed management practices on weed control index, nutrient removal by weeds and nutrient uptake by irrigated sunflower. The experiment was laid out in randomized block design (RBD) with twelve treatments and replicated thrice viz., unweeded control (T1), Hand weeding twice at 15 and 30 DAS (T2), Pre-emergence application of pendimethalin 0.68 kg ai ha-1 (T3), Pre-emergence application of pendimethalin 1 kg ai ha-1 (T4), Pre-emergence application of pendimethalin 0.68 kg ai ha-1 + one hand weeding (30 DAS) (T5), Pre-emergence application of pendimethalin 1 kg ai ha-1 + one hand weeding (30 DAS) (T6), Pre-emergence application of pendimethalin 0.68kg ai ha-1 + Intercropping with blackgram (T7), Pre-emergence application of pendimethalin 1 kg ai ha-1 + Intercropping with blackgram (T8), Pre-emergence application of pendimethalin 0.68kg ai ha-1 + Mulching with sugarcane trash at 21DAS (T9), Pre-emergence application of pendimethalin 1kg ai ha-1 + Mulching with sugarcane trash at 21 DAS (T10), Intercropping alone (T11), Mulching alone (T12). Results of the experiment revealed that Hand weeding twice at 15 and 30 DAS was found to be superior in weed control index and nutrient uptake by crop. This was on par with Pre-emergence application of pendimethalin 1kg ai ha-1 + Intercropping with blackgram.

S. Kalaisudarson*1, A. P. Srinivasaperumal2, S. Srinivasan3, T. Balakrishnan4 and V. Balamurugan5 Click here to download file

Research Article | Published online : 03-Aug-2021