Urea of foliar spray should not contain biuret more than
A. 5.6%
B. 1.5%
C. 3.4%
D. 7.8%
Answer: Option B
Solution(By Examveda Team)
The Urea of foliar spray should not contain a biuret of more than 1.5%.Fertilizer-grade urea contains the impurity biuret which is toxic to the plant, especially when applied as a leaf dressing.
Biuret of more than 1.5% can damage the root of the plant and also useful bacteria and chock the capillary of the root cell, Nitrogen carrying capacity will be reduced.
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B. Cyanobacteria
C. Purple nonsulphur bacteria
D. Green sulphur bacteria
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