Yoshida - 1981 - Fundamentals of Rice Crop Science

3.12. Manganese 160
3.12.1. Occurrence of deficiency and toxicity 160
3.12.2. Manganese in soil solution 160
3.12.3. Characteristics of manganese nutrition 161
3.13. Sulfur 162
3.13.1. Occurrence of deficiency 162
3.13.2. Sulfate in soil solution 162
3.13.3. Natural supply of sulfur 162
3.13.4. Critical sulfur content and critical N-S ratio at different growth
stages 164
3.14. Silicon 165
3.14.1. Occurrence of deficiency 165
3.14.2. Silicon in soil solution 166
3.14.3. Functions of silicon 166
3.14.4. Interrelationship between silicon and nitrogen nutrition 167
3.14.5. Criteria for determining the need for silicate application 167
3.15. Hydrogen Sulfide 168
3.15.1. Occurrence of toxicity 168
3.15.2. Hydrogen sulfide in soil solution 169
3.15.3. Varietal differences in tolerance for hydrogen sulfide toxicity 171
3.16. Organic acid 171
3.16.1. Occurrence of toxicity 171
3.16.2. Organic acid in soil solution 172
3.16.3. Mode of toxicity 172
3.17. Iodine 174
3.17.1. Occurrence of toxicity 174
3.17.2. Iodine in soil solution 174
3.17.3. Plant’s response to iodine toxicity 175
3.18. Salinity 175
3.18.1. Occurrence of salinity 175
3.18.2. Salts in soil solution 175
3.18.3. Physiological nature of salinity injury 176
3.18.4. Critical salinity level and varietal difference in salinity
tolerance 176
NUTRITIONAL
4 DISORDERS
4.1. Nutritional Disorders vs Physiological Diseases 177
4.2. Occurrence of Nutritional Disorders 177
4.2.1. Cause of nutritional disorders 177
4.2.2. Visible symptoms 178
4.2.3. Nitrogen response 178
4.3. Diagnostic Techniques 179
4.3.1. Visible symptoms 179
4.3.2. Plant tissue analysis 181
4.3.3. Soil analysis 186
4.4. Assessment of the Diagnosis 186
4.4.1. Foliar spray technique 186
4.4.2. Greenhouse experiment 187
4.4.3. Field experiment 187