Influence of Nitrogen on Growth Indices of Different Wheat Varieties in Late Sown Condition

Abstract

Growth indices changes from sowing to harvesting of the crop were monitored under the influence of four varieties (PBW- 373, HD- 2285, K-7903, HUW-234) and four Nitrogen levels (0 kg ha-1 (Control), 120 kg ha-1,150 kg ha-1 and 180 kg ha-1) during rabi season of 2019-20 and 2020-21. Analysis of the two years average data indicated that PBW-373 along with 150 kg N ha-1 resulted in the highest significant values of Crop Growth Rate (CGR) and Net Assimilation Rate (NAR) up to 60 and 90 DAS respectively after which it declines whereas Relative Growth Rate (RGR) show a declining trend from sowing till harvesting. Net Assimilation Rate (NAR) was found to be unaffected by the varieties but was significantly affected by different levels of nitrogen being highest with 150 kg N ha-1. However, it was found to declines from sowing to harvesting. Leaf area duration (LAD) was also found to increases from sowing till harvest being highest with 150 kg N ha‑1. No interaction effect was found among different treatments. The overall findings concluded that variety PBW-373 along with 150 kg N ha-1 could be more beneficial in the study area.