Author(s):

Khemlata Verma, VK Samadhiya and Parmanand

Abstract: The investigation entitled “Effect of nitrogen management practices on productivity and nitrogen use efficiency in rice crop.” was carried out under field conditions during kharif 2017 at the Research cum Instructional Farm, Indira Gandhi Krishi Vishwavidyalaya, Raipur (C.G). The soil of the experimental field was vertisol. Rice variety “Rajeshwari 1”was used as a test crop. The experiment was laid out in randomized complete block design with seven treatments and three replications. The treatments comprised of T₁ (N₀:P₆₀:K₄₀ control), T₂ (N₁₀₀:P₆₀:K₄₀ N through prilled urea),T₃ (N₁₀₀:P₆₀:K_{40 ,} 90 Kg/ha. N through PU +10 Kg/ha. foliar spray), T₄ (N₁₀₀:P₆₀:K₄₀ , N through urea briquettes), T₅ (N₈₀:P₆₀:K₄₀, N through urea briquettes), T₆ (N₈₀:P₆₀:K₄₀ 70 Kg/ha. N through UB +10 Kg/ha. foliar spray), T₇ (N₆₀:P₆₀:K₄₀ , 50 Kg/ha. N through UB +10 Kg. foliar spray). The experiment was laid out in a randomized block design with three replications. Prilled urea was applied in three equal splits. USG were applied in between 7- 10 DAT and the briquettes were placed at 5-7.5 cm depth between four hills 15 X 15 cm (plant spacing). 2% of urea solution applied in as a foliar spray. The yield and yield attributing characters of rice responded significantly superior with T₄ (N₁₀₀:P₆₀:K₄₀) N through urea briquettes i.e. 53.68 q/ha. Grain yield over GRD T₂ (N₁₀₀:P₆₀:K₄₀ N through prilled urea). Nitrogen (N) content and N uptake was recorded significantly superior in T₄ (N₁₀₀:P₆₀:K₄₀ N through urea briquettes) i.e. 1.25, 0.47 grain & straw content respectively & 104.5 kg/ha. total uptake of nitrogen. Nitrogen use efficiency (NUE) and benefit cost ratio is higher in the T₆ (N₈₀:P₆₀:K_40,70 Kg/ha. N through UB +10 Kg/ha. foliar spray) followed by T₅ (N₈₀:P₆₀:K₄₀, N through urea briquettes) and T₄ (N₁₀₀:P₆₀:K₄₀, N through urea briquettes). This results indicate that application of USG in rice field decreases the losses of N and save the fertilizer, leading to efficient uptake and utilization of applied N. Nitrogen use efficiency also influence by foliar spray to rice plant.

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