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<p>Knowledge of nitrogen (N) effects on crop–weed competitive interactions could be helpful in developing improved weed management programs. Hence, our aim was to understand the effect of N fertilization and weed infestation on potato-weed competitive interactions. The two-year field experiment containing four N levels (0, 80, 160 and 240&#xa0;kg per ha) and two weed conditions (weedy and weed-free) were conducted using split plot design. The dominant weed species in the experimental area were <i>Chenopodium album</i> L., <i>Salsola kali</i> L., <i>Diplotaxis tenuifolia</i> (L.) DC., and <i>Amaranthus retroflexus</i> L. The high weed densities (66–86 and 119–171 plants per m<sup>2</sup>), and dry weights (147–169&#xa0;g and 257–325&#xa0;g) were observed at both the 11 and 13&#xa0;weeks after sowing (WAS), in the treatments with 0 and 240&#xa0;kg per ha N, during both the years, showing the ability of weeds to compete under both nutrient scarce and nutrient rich conditions. The highest potato plant dry biomass (475.4, 529.0 and 393.6, 444.4&#xa0;g per m<sup>2</sup>) was obtained at 240&#xa0;kg per ha N, proving the increase in growth rate by 42.2, 40.5% and 39.8, 38.0% respectively, at high N levels recorded at 11 and 13 WAS, during 1st and 2nd year of the study. The tuber yield (39.34 and 35.75 t per ha) was 51 and 35.5% higher from the treatment of 160&#xa0;kg per ha N, compared with no N treatment, under weed-free conditions, in the 1st and 2nd year of the study respectively, indicating the importance of N fertilization and weed-free conditions. The tuber dry matter (21.9 and 22.9%), starch (16.7 and 16.9%) and specific gravity (1.084&#xa0;g per cm<sup>3</sup> for both years) were maximum in treatment where N was applied at 160&#xa0;kg per ha under weedy conditions. The maximum yield loss (27.7 and 44.5%) due to weeds were observed in the treatment where no N was applied, during 1st and 2nd year, respectively. The results of the current study proved that maintaining proper nitrogen doses increase potato yield; it also benefits the weeds, demanding more accurate fertilization and efficient weed control.</p>

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Investigating the impact of nitrogen fertilization on the crop-weed competitive interactions in potato

  • 期刊论文

  • 发表日期：

    2026年3月28日

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  • Taseer Ahmad,
  • Khawar Jabran

摘要

Knowledge of nitrogen (N) effects on crop–weed competitive interactions could be helpful in developing improved weed management programs. Hence, our aim was to understand the effect of N fertilization and weed infestation on potato-weed competitive interactions. The two-year field experiment containing four N levels (0, 80, 160 and 240 kg per ha) and two weed conditions (weedy and weed-free) were conducted using split plot design. The dominant weed species in the experimental area were Chenopodium album L., Salsola kali L., Diplotaxis tenuifolia (L.) DC., and Amaranthus retroflexus L. The high weed densities (66–86 and 119–171 plants per m2), and dry weights (147–169 g and 257–325 g) were observed at both the 11 and 13 weeks after sowing (WAS), in the treatments with 0 and 240 kg per ha N, during both the years, showing the ability of weeds to compete under both nutrient scarce and nutrient rich conditions. The highest potato plant dry biomass (475.4, 529.0 and 393.6, 444.4 g per m2) was obtained at 240 kg per ha N, proving the increase in growth rate by 42.2, 40.5% and 39.8, 38.0% respectively, at high N levels recorded at 11 and 13 WAS, during 1st and 2nd year of the study. The tuber yield (39.34 and 35.75 t per ha) was 51 and 35.5% higher from the treatment of 160 kg per ha N, compared with no N treatment, under weed-free conditions, in the 1st and 2nd year of the study respectively, indicating the importance of N fertilization and weed-free conditions. The tuber dry matter (21.9 and 22.9%), starch (16.7 and 16.9%) and specific gravity (1.084 g per cm3 for both years) were maximum in treatment where N was applied at 160 kg per ha under weedy conditions. The maximum yield loss (27.7 and 44.5%) due to weeds were observed in the treatment where no N was applied, during 1st and 2nd year, respectively. The results of the current study proved that maintaining proper nitrogen doses increase potato yield; it also benefits the weeds, demanding more accurate fertilization and efficient weed control.