Contents

7.1 Introduction 183

7.2 Sulfur in Plant Physiology 184

7.2.1 Uptake, Transport, and Assimilation of Sulfate 185

7.2.1.1 Foliar Uptake and Metabolism of Sulfurous Gases 187

7.2.2 Major Organic Sulfur Compounds 188

7.2.3 Secondary Sulfur Compounds 192

7.2.4 Interactions between Sulfur and Other Minerals 195

7.2.4.1 Nitrogen-Sulfur Interactions 195

7.2.4.2 Interactions between Sulfur and Micronutrients 197

7.3 Sulfur in Plant Nutrition 198

7.3.1 Diagnosis of Sulfur Nutritional Status 198

7.3.1.1 Symptomatology of Single Plants 198

7.3.1.2 Symptomatology of Monocots 200

7.3.1.3 Sulfur Deficiency Symptoms on a Field Scale 201

7.4 Soil Analysis 202

7.5 Plant Analysis 206

7.5.1 Analytical Methods 206

7.5.2 Assessment of Critical Nutrient Values 208

7.5.3 Sulfur Status and Plant Health 217

7.6 Sulfur Fertilization 219

Acknowledgment 223

References 223

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