Front Cover; Advances in Agronomy, Volume 40; Copyright Page; Contents; Preface; CHAPTER 1. AGRONOMY OF WHITE CLOVER; I. Introduction; II. Morphology and Function; III. Environment; IV. Culture; V. Nitrogen Fixation; VI. Quality; VII. Grass/White Clover Dynamics; VIII. Production and Management; IX. Potential Production; X. Management Guidelines; XI. Conclusions; References; CHAPTER 2. AGRONOMIC VALUE OF UNACIDULATED AND PARTIALLY ACIDULATED PHOSPHATE ROCKS INDIGENOUS TO THE TROPICS; I. Introduction; II. Indigenous Phosphate Deposits in the Tropics.

III. Agronomic Potential of Phosphate Rock for Direct ApplicationIV. Physical Factors Influencing Expression of Agronomic Potential; V. Soil Factors Influencing Expression of Agronomic Potential; VI. Climatic Factors Influencing Expression of Agronomic Potential; VII. Partial Acidulation of Phosphate Rock; VIII. Regional Findings on Direct Application of PR and PAPR; IX. Summary and Conclusions; References; CHAPTER 3. CROP SIMULATION MODELS IN AGRONOMIC SYSTEMS; I. Need for Crop Simulation Models and Types of Models; II. Model Building; III. Model Testing; IV. Model Applications; V. Summary.