President, Nigeria Institute of Soil Science (NISS), Professor Ayo Ogunkunle has posited that adequate knowledge of the characteristics of soil is necessary for its sustainable use and management. Ogunkunle stated this while welcoming participants to the training of farmers and extension workers on management of problematic soils at the Institute of Agricultural Research and Training (IAR&T), Moor Plantation, Ibadan recently. He noted that:“The old practice of shifting cultivation is becoming extremely difficult due to the rapid population expansion and stiff competition by other land use type…