Question

The Khaira disease of rice may be controlled by spraying a mixture of:

A 5 kg ZnSO_4 + 2.5 kg lime
B 2.5 kg ZnSO_4 + 5 kg lime
C 5 kg ZnSO_4 + 5 kg lime
D 2.5 kg ZnSO_4 + 2.5 kg lime
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