Browning of Rice is caused by ________

📝 Additional Information:
→ Browning of Rice: Iron toxicity in rice is known as browning of rice.
→ Iron toxicity is a major problem for rice production in waterlogged acid-sulfate conditions of ultisols and oxisols soil order.
→ Phalguna variety is tolerant of Iron toxicity.
→ Zn deficiency in rice plants affects them with Khaira disease.
→ Symptoms of Khaira disease:

Initially yellow color spots appear on leaves, which later turn to brown spots.
These spots appear on the upper side of the leaves.
The disease affects both the nursery and the main field.