A field experiment was carried out to assess the impact of varying nitrogen levels and varieties of ryegrass (Lolium multiflorum L.) on forage yield and quality in western Uttar Pradesh. This study was performed during the Rabi seasons of 2022-23 and 2023-24 at the Crop Research Centre of Sardar Vallabhbhai Patel University of Agriculture and Technology, Meerut (U.P.). The objective of the research was to examine how varying nitrogen levels and ryegrass varieties affected forage yield performance. The study site was located at 29° 40' N latitude and 77° 42' E longitude, at an elevation of 237 meters above sea level. The soil was a well-drained, sandy loam with a slightly alkaline PH. It had moderate levels of available nitrogen and phosphorus, but a high level of available potassium, with an electrical conductivity of 1.6 dS/m (based on a 1:2 soil-to-water suspension). The experiment employed a factorial randomized block design, incorporating 5 nitrogen levels (0, 50, 75, 100, and 125 kg ha^-1) and 3 ryegrass varieties (Punjab ryegrass-1, Punjab ryegrass-2, and Milky Graze-3636), each replicated 3 times. Data were collected on growth, physiology, green forage yield, quality, and related traits within a net plot area of 16 m², while straw content, nutrient uptake, soil nutrient availability, and production economics were assessed using standard procedures. The results revealed that the leaf area index was significantly greater at all stages of ryegrass growth when 125 kg nitrogen ha-1 was applied.
