Q.3
Sensitive crops like vegetables, fruits (citrus) and horticultural crops can tolerate biuret content in urea up to
- Biuret Toxicity in Urea: Biuret ($NH_2-CO-NH-CO-NH_2$) forms during urea manufacturing when temperatures exceed $133^\circ\text{C}$.
- Crop Tolerance Thresholds:
- General soil application: Biuret up to $1.5\%$ is permissible under FCO specifications.
- Foliar spray on general crops: Biuret should not exceed $0.5\%$.
- Sensitive citrus, fruit trees, and vegetables: Foliar biuret must not exceed 0.25% to prevent severe leaf tip chlorosis and marginal necrosis ("yellow tip"). (Correct answer: Option 2)
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