Nutrient Elements Exists in Soils Various Forms - The Soil Ecosystem | SOIL 205, Study notes of Agricultural engineering

Download Nutrient Elements Exists in Soils Various Forms - The Soil Ecosystem | SOIL 205 and more Study notes Agricultural engineering in PDF only on Docsity! FIGURE 8.13 Ranges in the cation exchange ca- pacities (at pH 7) that are typical of a variety of soils and soil materials. The high CEC of humus shows why this colloid plays such a prominent role in most soils, and especially those high in kaolinite and Fe, Al oxides, clays that have low. CCS. FIGURE 1.19 Nutrient elements exist in soils in various forms characterized by different accessibility to plant roots. The bulk of the nutrients is locked up in the structural framework of primary minerals, organic matter, ‘lay, and humus. A smaller proportion of each nutrient is adsorbed in a swarm of fons near the surfaces of soil colloids (clay and organic matter). From the swarm of adsorbed ions, a still smaller amount is released into ‘the bulk soil solution, where uptake by plant roots can take place. (Diagram courtesy of R. Weil)