Abstract Topographic variability significantly influences soil fertility and agricultural productivity, especially in undulating landscapes. Understanding soil property variability is crucial for enhancing crop production and optimizing resource use. This study investigates soil variability at the Department of Agriculture Research Station in Sual, Pangasinan, with a focus on sloped terrain. Soil samples were collected from foot slopes, mid‐slopes, and upper‐side slopes at 0‐ to 15‐cm and 15‐ to 30‐cm depths. The foot slopes and upper‐side slopes exhibited clay loam textures, while the mid‐slope demonstrated a clayey texture. The upper‐side slope was notably acidic and deficient in organic matter, phosphorus, and potassium. Conversely, the mid‐slope contained some organic matter but had low cation exchange capacity and high acidity. The foot slope indicated moderate fertility. Crop suitability assessments revealed that lower‐slope areas are moderately to highly suitable for intensive cropping, whereas upper slopes require conservation interventions and fertility enhancement. To improve agricultural productivity and prevent degradation, the study recommends a strategic combination of organic and inorganic fertilizers, along with improved farming practices, on the foot slope. These findings highlight substantial variations in soil properties across slope positions. Targeted conservation strategies are crucial for maintaining soil health and agricultural viability in mid‐ and upper‐slope areas.
Aquino et al. (Thu,) studied this question.