Front Cover; Advances in Agronomy, Volume 24; Copyright Page; Contents; Contributors to Volume 24; Preface; CHAPTER 1. THE ROLE OF EXTRACHROMOSOMAL INHERITANCE IN PLANT BREEDING; I. Introduction; II. Composition of the Cytoplasm; III. DNA and Its Role in Cytoplasmic Organelles; IV. Plant Traits Influenced by Cytoplasm; V. Possible Mechanisms Involved in Cytoplasmic Inheritance of Plant Traits; VI. Cytoplasmic Differences-Possible Origin and Ramifications; References; CHAPTER 2. THE CHEMISTRY OF SUBMERGED SOILS; I. Introduction; II. Kinds of Submerged Soils.

III. Characteristics of Submerged SoilsIV. Electrochemical Changes in Submerged Soils; V. Chemical Transformations in Submerged Soils; VI. Mineral Equilibria in Submerged Soils; VII. Perspectives; References; CHAPTER 3. PHYSIOLOGICAL GENETICS OF CROP YIELD; I. Introduction; II. Identification of Genetic Variation; III. Genetics and Heritability; IV. Relative Importance of Physiological Components; V. Using Genetic Differentiation for Elucidation of Physiological and Biochemical Pathways; VI. Summary and Applications in Plant Breeding; References; CHAPTER 4. ZINC IN SOlLS AND PLANT NUTRITION.

I. IntroductionII. Zinc in Soils; III. Availability of Zinc to Plants; IV. Diagnosing Zinc Deficiencies; V. Correction of Zinc Deficiency; VI. Summary and Future Research Needs; References; CHAPTER 5. RESISTANCE OF PLANTS TO INSECTS; I. Introduction; II. Terminology; III. Insect Resistance in Selected Field Crops; IV. Horticulture Crops; V. Forest Trees; VI. Miscellaneous; VII. Problems Associated with Breeding for Resistance to Insects; VIII. Utilization of Resistant Varieties; IX. Summary; References; CHAPTER 6. TRACE METALS IN SOILS, PLANTS, AND ANIMALS; I. Introduction.

II. The Soil-Plant ComplexIII. Aquatic Systems; IV. Continuing Research; References; CHAPTER 7. BEHAVIOR OF HERBICIDES IN PLANTS; I. Introduction; II. Benzoic Acids; III. Dinitroanilines; IV. Triazines; V. Heterocyclics; VI. Diphenylethers; VII. Substituted Ureas; VIII. Carbamates; IX. Anilides; X. Summary; References; CHAPTER 8. CRITICAL CATION ACTIVITY RATIOS; I. Introduction; II. Cation Activity Ratios in Relation to Nutrient Uptake of Plant Growth; III. Experimental Evidence; IV. Threshold Ratios; References; Author Index; Subject Index.