Asian Journal of Soil Science and Plant Nutrition

The experiment was conducted at the Integrated Farming System Research Station, Karamana, Thiruvananthapuram, Kerala Agricultural University, Kerala, India, during the Kharif Season 2022-2023 to study the influence of different zinc nutrition treatments on weed competitiveness in rice. The treatments were T₁- Soil application of ZnSO₄ at 20 kg ha^-1 T₂- Nutri priming with Nano Zn at 0.05% T₃- Nutri priming with Nano Zn at 0.05% + Foliar spray with Nano Zn at 0.05% at maximum tillering stage T₄-Nutri priming with ZnSO₄ at 0.5% T₅- Nutri priming with ZnSO₄ at 0.5% + Foliar spray with Nano Zn at 0.05% at maximum tillering stage T₆- Foliar spray with Nano Zn at 0.05% at maximum tillering stage and panicle initiation stage T₇- Foliar spray withZnSO₄ at 0.5% at maximum tillering stage and panicle initiation stage T₈- Control (Recommended dose of nutrients without application of P and Zn). The experiment was laid out in a randomized block design with three replications. The predominant weed flora was grasses. The highest weed smothering efficiency was recorded in T₃ and T₂ at 20 days after transplanting (DAT) and 40 DAT. The lowest weed persistence index was recorded in T₃. It can be concluded that Nutri priming with Nano Zn at 0.05%, followed by foliar spray with Nano Zn at 0.05% at the maximum tillering stage, enhanced the weed competitiveness in rice.