AI Summary & Key Takeaways
AI InsightThese interventions are critical to restoring soil productivity and ensuring agricultural sustainability in the region.
📌 3 Key Takeaways
Abstract
This study investigates the effects of decades of continuous cultivation on soil properties at the Institute for Agricultural Research Farm in Samaru, Nigeria. Spanning over 50 years of intensive farming, the study utilizes legacy data from a 1984 soil survey and compares it with present-day findings to evaluate changes in soil properties. Fieldwork covered nine soil units across 338.50 hectares, involving site identification and soil sampling. Results reveal significant changes in soil properties over time. Soil texture exhibited increased silt content in soil units P3 (T = 1.99, P = 0.097, MD = -90.00 g kg⁻¹), and P6 (T = 1.43, P = 0.263, MD = 88.00 g kg⁻¹) due to tillage-induced pulverization, while sand content varied (soil units: P1 (T = 0.13, P = 0.904, mean difference (MD = 60.00 g kg⁻¹) and P5 (T = -2.97, P = 0.031, MD = -28.33 g kg⁻¹) depending on erosion and deposition patterns. Soil chemical properties demonstrated notable increases in pH (P2 (T = -6.94, P = 0.001, MD = -1.39), and A2 (T = -12.97, P = 0.0001, MD = -2.21), linked to accumulation of exchangeable bases, particularly in poorly drained units. Organic carbon (P2 (T = 2.21, P = 0.075, MD = 4.11 g kg⁻¹) and P6 (T = 1.05, P = 0.338, MD = 4.55 g kg⁻¹)) and total nitrogen levels showed declines in some soil units due to continuous cropping of non-leguminous crops and increased mineralization, while other units benefited from legume cultivation. Cation exchange capacity and base saturation decreased across most units, reflecting nutrient depletion and reduced organic matter inputs. The findings emphasize the detrimental effects of continuous cultivation on soil fertility. To mitigate these effects and improve soil health, the study recommends adopting sustainable practices such as organic and inorganic fertilizer application, conservation tillage, and proper residue management. These interventions are critical to restoring soil productivity and ensuring agricultural sustainability in the region.