Author(s): A. CHAKRABORTY

Abstract: A field experiment was conducted at the Regional Research Substation, Sekhampur, Birbhum, Bidhan Chandra Krishi Viswavidyalaya, West Bengal during early summer of 2009 and 2010 to study the performance of sesamum grown with variable rates of N and P levels and to compute the optimum and economic levels of the applied nutrients. The treatments comprised of four levels each of N (0, 20, 40 and 80 kg ha-1) and P (0,10,20 and 40 kg ha-1) laid out in a factorial randomized complete block design with three replications. Increasing the application rates of N and P enhanced the number of seeds/capsule, number of capsules/plant and thousand grains weight. The highest average mean seed yields were obtained with 80 kg ha-1 N (953 kg ha-1) and 40 kg ha-1 P (857 kg ha-1). The agronomic efficiencies were highest with lower application rates of N (16.3 kg kg-1 of N) and P (22.6 kg kg-1 of P). The relationship between the applied amounts of N and P with sesamum yield was defined by quadratic functions. The estimated optimum levels of N and P were 72 and 36 kg ha-1while the economic levels were 61 and 35 kg ha- respectively.

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