Kapoor, A.K.Pankaj Kumar2016-11-212016-11-212007http://krishikosh.egranth.ac.in/handle/1/86569The present investigation was undertaken to study the nitrate distribution in soil profile and yield of cotton in relation to different levels of nitrogen. To achieve the objectives, a field experiment was conducted in micro plots (2M×2M) at the research farm of CCSHAU, Hisar. Cotton crop was taken with seven treatments of nitrogen viz., 0, 34.50, 45.54, 34.50, 40.02, 34.50 and 11.04 g N per plot applied through urea and/or nitrate containing irrigation water. The experimental results showed that mean EC, Ca2+, Mg2+, Na+, K+, HCO3-, Cl-, SO42- concentration of the soil profile decreased after the harvest of the crop as compared to at the start of the experiment irrespective of treatments. The maximum NO3–N, 47.88 (Kg/ha) was observed in T3 treatment after first irrigation in 0-15 cm soil depth while the minimum NO3–N, 5.39 (Kg/ha) in T1 treatment in 30-45 cm depth after first irrigation. The depth distribution of NO3–N concentration of the soil profile was predicted using models i) LEACHM considering water flow equation of Addiscot, uptake, transformation of different forms of nitrogen, rate constants, other exchange processes and weather parameters and ii) Pal et al. 1990, considering initial NO3–N concentration of the soil profile and of the irrigation water, evaporation/ evapo-transpiration, rainfall and field capacity of the soil profile. The magnitude and the trend of the experimental and the simulated NO3 concentration of the soil profile after different irrigations and harvest of the crop showed a good agreement between the two by LEACHM model (r2= 0.92, a= -3.18 and b= 1.51) where as by the Pal et al. 1990 model, the agreement was not up to the mark. (r2= 0.45, a= 3.67 and b= 0.448). Crop removal of nitrogen was highest in T7 treatment (93.5 Kg N/ha) and lowest in T1 treatment (91.7 Kg N/ha), respectively. At sowing, the total nitrogen in the soil profile was 186.8 Kg N/ha (157 Kg NO3 /ha and 29.8 Kg NH4/ha) while at the time of harvest, the total nitrogen was highest in T3 (132.1 Kg N/ha) and lowest in T1 (64.6 Kg N/ha). The mean plant height value was found to be lowest (138.50 cm) under T1 and highest (167 cm) in T3 treatment. The highest mean number of bolls was observed in treatment T3 (33.50) and lowest treatment T1 (16). The highest and the lowest mean cotton yield of 389.50 and 225.75 gm/plot were obtained under treatments T3 and T1, respectively.enIrrigation, Inorganic acid salts, Nitrogen, Crops, Cotton, Yields, Organic compounds, Leaching, Marketing, FertilizersThesis