The following points highlight the six major types of nutrient toxicity symptoms in rice. The types are: 1. Nitrogen 2. Iron 3. Aluminium 4. Manganese 5. Boron 6. Sulphide. Nutrient Toxicity Symptom: Type # 1. Nitrogen (N): Plants look overly green; may be healthy, but also may be lodged at maturity (especially in direct-seeded rice); […]