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Effect of Varying Nitrogen Regimes on Growth, Seed Yield, and Nutrient Accumulation in Isabgol

ABSTRACT A greenhouse experiment was conducted to determine the optimum dose of nitrogen (N) fertilizer for attaining maximum yield of isabgol (Plantago ovata Forsk.). Sixty three-day-old plants were subjected to varying levels of N (0, 30, 60, and 90 kg N/ha) until seed harvesting. Maximum growth and seed yield occurred at 60 kg N/ha, whereas 90 kg/ha was inhibitory to isabgol growth. The growth and seed yield recorded at 30 or 60 kg N/ha did not differ much, and in view of the high cost to be incurred from applying 60 kg N/ha and the relatively low yield achieved at this level, 30 kg N/ha would be a much more suitable level for isabgol. Accumulation of N, potassium (K), and phosphorus (P) in shoots or roots of isabgol increased consistently under increasing levels of N, but this pattern of increase in the levels of three nutrients in plant tissues was negatively associated with the growth of the crop, particularly at the supra-optimal N level (90 kg N/ha).