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Xem thêm: Advances in agronomy volume 05 , Chapter 1. A Half Century of Wheat Improvement in the United States, II. Acreage, Yield per Acre, and Production in the United States, III. Improvement in Cultural Practices, IV. The Role of Improved Varieties, V. Improvements in Methods of Breeding Wheat, VII. Control of Insect Pests of Wheat, Chapter 2. The Soil Organic Fraction, VII. Contribution to Plant Nutrition, III. General Characteristics of Modern Farming, Chapter 4. Chemical Weathering of Minerals in Soils, II. Relative Stability of Minerals; Weathering Sequences and Indexes, III. Factors Affecting the Reaction Rates of Chemical Weathering, IV. Frequency Distribution of Minerals in Soils in Relation to Chemical Weathering, V. Weathering Release of Nutrient Elements from Soil Minerals, Chapter 5. The Changing Pattern of Agronomy and Horticulture in Canada, III. Field Husbandry, Soils and Agricultural Engineering, II. Factors Influencing Soil Structure, III. Soil Management for Structure Maintenance, IV. Influence of Rotations on Conservation and Productivity