Khaira disease of Rice crop is due to the deficiency of ........

Explanation:

Zinc deficiency causes Khaira disease in rice grown in the calcareous soil of north India.                                                                                                        (1) Discoloration of lower leaves (brown streaks and blotches) occurring two weeks after transplanting.                                                                                  (2) The midrib at the base of growing leaves is sometimes chlorotic.                                                                                                                                        (3) Plants are stunted, and roots are scanty.