The book A Manual of Soil Physics was written by author Barker, Percy Bousfield. [from Old Catalog] Here you can read free online of A Manual of Soil Physics book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is A Manual of Soil Physics a good or bad book?
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Fill the third pan with an equal amount of clay, then add sufficient water to make the contents of each pan in a slushy condition, and put them away to dry. When dry, make drawings of the soils, showing the cracks. Work over the material in each pan, noting carefully the structure and hardness of each soil. References : Lyon and Fippin : Soils, pp. 113-116. Van Slyke : Fertilizers and Crops, pp. 134-140. Questions : 1. In which pan is the soil the hardest? the softest? Why? 2. From the results ...of the exercise, is it advisable to add organic matter to the fine-textured soils to alter their physical condition? 3. When is it practical to add sand to a soil in order to change the texture and the structure? 4. What are the most important physical properties of soils that are modified by the addition of sand or organic matter? [63] EXERCISE XXVIII EFFECT OF ALTERNATE WETTING AND DRYING ON SOIL STRUCTURE Object. The object of the exercise is to study the effect of alternate wetting and drying on the structure of soils.
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